Changes between Version 28 and Version 29 of ticket/0665_mass_heat_salt_fluxes


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Timestamp:
2012-10-26T15:57:26+02:00 (8 years ago)
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gm
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  • ticket/0665_mass_heat_salt_fluxes

    v28 v29  
    1 [[PageOutline]] 
    2 Last edited [[Timestamp]] 
    3  
    4 [[BR]] 
     1[[PageOutline]] Last edited [[Timestamp]] 
    52 
    63'''Author''' : Andrew Coward (2012); Gurvan Madec, Yevgeny Aksenov, Matthieu Leclair (2010-11) 
     
    118 
    129=== Description === 
    13  
    1410Revisit the formulation of the fluxes between ocean, ice and atmosphere : an exchange of water (mass exchange) is now explicitly associated with an exchange of heat and salt content. This modification simplifies the implementation of a fully embedded sea-ice. There are several aspects to this work:[[BR]] 
    1511 
     
    18142. To introduce a more symmetric treatment of  the surface trend of temperature and salinity by suppressing the emps (virtual flux due to concentration/dilution effects of freezing and melting) in favour of a salt flux array (sfx) such that, for the linear free surface, in all cases (levitating vs embedded sea-ice; surface restoring vs free running) the surface trend is expressed as:[[BR]] 
    1915 
    20  
    21  
    2216{{{ 
    2317dT = .... qns/(rau0*Cp*e3t) + emp*Tn/(e3t*rau0) 
     
    2519dS = .... sfx/(rau0*e3t)        + emp*Sn/(rau0*e3t) 
    2620}}} 
    27  
    2821where sfx contains only the salt flux due to freezing and melting. In the non-linear free surface case there is no concentration/dilution effect because mass is explicitly exchanged so the trends become: 
    2922 
     
    3225dS = .... sfx/(rau0*e3t)         
    3326}}} 
    34  
    35273. To introduce namelist options to select options for embedding the sea-ice: 
    36  
    3728 
    3829{{{ 
     
    41322 Fully embedded sea-ice (mass exchange + pressure exerted on the ocean) 
    4233}}} 
    43  
    44  
    45  
    4634=== Work in previous years ==== 
    4735 
    48 '''Old Branch''' : [https://forge.ipsl.jussieu.fr/nemo/browser/branches/DEV_r1837_mass_heat_salt_fluxes  DEV_r1837_mass_heat_salt_fluxes ]  
     36'''Old Branch''' : [https://forge.ipsl.jussieu.fr/nemo/browser/branches/DEV_r1837_mass_heat_salt_fluxes DEV_r1837_mass_heat_salt_fluxes] 
     37 
    4938---- 
    50  
    51 useful commands  
     39useful commands 
     40 
    5241{{{ 
    5342* check out of NEMO directory: 
     
    5746svn ci  -m  "ticket:#665  blah_blah"    list_of_file 
    5847}}} 
    59  
    6048---- 
    61  
    62  
    6349This update is the NOCS.4 task (Revisit of mass and salt fluxes) due by 2nd July 2010 
    6450 
    65  
    6651The main modifications concern OPA, LIM2 and LIM3. They are: 
    6752 
    68 ==== (0) stylistic modification    ==== 
    69  
    70    style changes only  have been put in '''revision 1855'''.  
    71  
    72    Nevertheless we have return back to the original revision 1850 from which we start from the trunk. The style changes we be re-added at the end of the development, after the testing phase. 
    73  
    74    The following is thus done directly from the trunk. 
    75  
    76  
    77 ====  (1) heat content of Freezing/Melting ice ====  
    78  
    79    In LIM2 only, the computation of the heat content of F/M ice is added (this is already done in LIM3 which is based on internal enrgy conservation, like CICE). The changes exactly mirror the changes introduced at NOCS in NEMO v3.0 when implementing first the sea-ice embedment. The basic idea is to reference at rt0 all the mass exchanges between ice and ocean.  
    80  
    81    NB: since emps becomes the salt flux, it is generally zero except with the salt exchange at the ocean-ice interface and when a SSS restoring in salinity is used (not when a equivalent freshwater flux formulation is used for the SSS restoring). Therefore emps done not appear anymore in all the sbc routine,. It is only set to zero in sbc_init, set to the ice-ocean salt flux in limsbc(_2), and modified in sbcssr if SSS retoring is used. 
    82  
    83    '''LIM2''' : the modules involved in the change are : (see also the '''revision 1858''') 
    84  
    85       • '''ice_2.F90''' : add arrays to describe the heat content associated with both snow and ice mass changes and also change the name of the mass changes. Thus the following lines : 
     53==== (0) stylistic modification ==== 
     54  style changes only  have been put in '''   revision 1855'''   . 
     55 
     56  Nevertheless we have return back to the original revision 1850 from which we start from the trunk. The style changes we be re-added at the end of the development, after the testing phase. 
     57 
     58  The following is thus done directly from the trunk. 
     59 
     60==== (1) heat content of Freezing/Melting ice ==== 
     61  In LIM2 only, the computation of the heat content of F/M ice is added (this is already done in LIM3 which is based on internal enrgy conservation, like CICE). The changes exactly mirror the changes introduced at NOCS in NEMO v3.0 when implementing first the sea-ice embedment. The basic idea is to reference at rt0 all the mass exchanges between ice and ocean. 
     62 
     63  NB: since emps becomes the salt flux, it is generally zero except with the salt exchange at the ocean-ice interface and when a SSS restoring in salinity is used (not when a equivalent freshwater flux formulation is used for the SSS restoring). Therefore emps done not appear anymore in all the sbc routine,. It is only set to zero in sbc_init, set to the ice-ocean salt flux in limsbc(_2), and modified in sbcssr if SSS retoring is used. 
     64 
     65  '''   LIM2'''    : the modules involved in the change are : (see also the '''   revision 1858'''   ) 
     66 
     67  • '''   ice_2.F90'''    : add arrays to describe the heat content associated with both snow and ice mass changes and also change the name of the mass changes. Thus the following lines : 
    8668{{{ 
    8769   REAL(wp), PUBLIC, DIMENSION(jpi,jpj) ::   rdqsnif       !: Variation of snow mass  
    8870   REAL(wp), PUBLIC, DIMENSION(jpi,jpj) ::   rdqicif       !: Variation of ice  mass  
    8971}}} 
    90       becomes 
     72  becomes 
    9173{{{ 
    9274   REAL(wp), PUBLIC, DIMENSION(jpi,jpj) ::   rdm_snw       !: Variation of snow mass over 1 time step           [Kg/m2] 
     
    9678}}} 
    9779 
    98       • '''thd_ice_2.F90''' : associated 1D array names (rdsnif_1d, rdmicif_1d) have been changed into (rdm_snw_1d, rdm_ice_1d) and (rdq_snw_1d, rdq_ice_1d) have been added. 
    99  
    100       • '''limthd_2.F90''' : introduce the new variable names, and pass the new variables (rdq_snw, rdq_ice) to the lim_thd_zdf and lim_thd_lac routines 
    101  
    102       Note 1: we suppress the change of sst_m from Celcius to Kelvin and vice versa  by adding a " + rt0 " at the 2 places it is used. 
    103  
    104       Note 2: zfontn has been suppressed as the heat associated with the melting of solid precipitation is now added to qns in sbc modules  ('''==>>  TO BE DONE in SBC''') 
    105  
    106       • '''limthd_lac_2.F90''' : introduce the new variable name (rdm_ice), and add the update of rdq_ice : the last DO loop of lim_thd_lac routine is transformed as follows : 
     80  • '''   thd_ice_2.F90'''    : associated 1D array names (rdsnif_1d, rdmicif_1d) have been changed into (rdm_snw_1d, rdm_ice_1d) and (rdq_snw_1d, rdq_ice_1d) have been added. 
     81 
     82  • '''   limthd_2.F90'''    : introduce the new variable names, and pass the new variables (rdq_snw, rdq_ice) to the lim_thd_zdf and lim_thd_lac routines 
     83 
     84  Note 1: we suppress the change of sst_m from Celcius to Kelvin and vice versa  by adding a " + rt0 " at the 2 places it is used. 
     85 
     86  Note 2: zfontn has been suppressed as the heat associated with the melting of solid precipitation is now added to qns in sbc modules  ('''   ==>>  TO BE DONE in SBC'''   ) 
     87 
     88  • '''   limthd_lac_2.F90'''    : introduce the new variable name (rdm_ice), and add the update of rdq_ice : the last DO loop of lim_thd_lac routine is transformed as follows : 
    10789{{{ 
    10890      DO ji = kideb , kiut 
     
    11193      END DO 
    11294}}} 
    113       becomes 
     95  becomes 
    11496{{{ 
    11597      DO ji = kideb , kiut 
     
    120102}}} 
    121103 
    122  
    123       • '''limthd_zdf_2.F90''' : introduce the new variable names (rdm_snw, rdm_ice), and and add the computation/update of rdq_snw, rdq_ice : 
    124  
    125       § " 9.1. Surface ablation and update of snow thickness and qstbif_1d ", the lines 
     104  • '''   limthd_zdf_2.F90'''    : introduce the new variable names (rdm_snw, rdm_ice), and and add the computation/update of rdq_snw, rdq_ice : 
     105 
     106  § " 9.1. Surface ablation and update of snow thickness and qstbif_1d ", the lines 
    126107{{{ 
    127108          !--volume of snow lost after surface melting and the associated mass 
     
    130111          rdmsnif_1d(ji) =  rhosn * dvsbq_1d(ji) 
    131112}}} 
    132       becomes 
     113  becomes 
    133114{{{ 
    134115          !--volume of snow lost after surface melting and the associated mass 
     
    141122}}} 
    142123 
    143       § " 9.4. Case of total ablation (ice is gone but snow may be left) ", the lines : 
     124  § " 9.4. Case of total ablation (ice is gone but snow may be left) ", the lines : 
    144125{{{ 
    145126          !---updating new ice thickness and computing the newly formed ice mass 
     
    151132          rdmsnif_1d(ji) =  rdmsnif_1d(ji) + ( 1.0 - frld_1d(ji) ) * ( h_snow_1d(ji) - zhsn ) * rhosn 
    152133}}} 
    153       becomes 
    154 {{{           
     134  becomes 
     135{{{ 
    155136          !---updating new ice thickness and computing the newly formed ice mass 
    156137          zhicnew   =  zihgnew * zhicnew 
     
    169150}}} 
    170151 
    171       § " 9.5. Update internal temperature and ice thickness. ", the following lines have been added at the end : 
     152  § " 9.5. Update internal temperature and ice thickness. ", the following lines have been added at the end : 
    172153{{{ 
    173154          ! update the ice heat content given to the ocean in freezing case (part from rt0_ice to tfu_1d) 
     
    176157}}} 
    177158 
    178       § " 10. Surface accretion. ", the lines : 
     159  § " 10. Surface accretion. ", the lines : 
    179160{{{ 
    180161          !---  volume change of ice and snow (used for ocean-ice freshwater flux computation) 
     
    182163          rdmsnif_1d(ji) = rdmsnif_1d(ji) + ( 1.0 - frld_1d(ji) )   * ( zhsnnew - h_snow_1d(ji) ) * rhosn 
    183164}}} 
    184       becomes 
     165  becomes 
    185166{{{ 
    186167          !---  volume change of ice and snow (used for ocean-ice freshwater flux computation) 
     
    193174         rdq_snw_1d(ji) = rdq_snw_1d(ji) + cpic * ztmp * ( rt0_snow - rt0 ) 
    194175}}} 
    195       and, at last, § " 11. Lateral ablation (Changes in sea/ice fraction) ", the lines : 
     176  and, at last, § " 11. Lateral ablation (Changes in sea/ice fraction) ", the lines : 
    196177{{{ 
    197178          !--variation of ice volume and ice mass  
     
    202183          rdmsnif_1d(ji) = rdmsnif_1d(ji) + zdvsnvol * rhosn 
    203184}}} 
    204       becomes 
     185  becomes 
    205186{{{ 
    206187          !--variation of ice volume and ice mass  
     
    231212}}} 
    232213 
    233       • '''phycst.F90''' : style changes + : 
     214  • '''   phycst.F90'''    : style changes + : 
    234215{{{ 
    235216 - update of name:    rau0r   ==>>  r1_rau0      ;      ro0cpr = r1_rau0_rcp 
     
    238219                    lfus = xlsn / rhosn    (for lim2, already defined in lim3) 
    239220}}} 
    240          z1_rau0   implies changes in '''dynzdf_exp.F90'''   ;   '''dynzdf_imp.F90'''   and   '''eosbn2.F90''' 
    241  
    242          r1_rau0_rcp   implies changes in '''trabbc.F90'''   ;   '''traqsr.F90'''   and   '''eosbn2.F90''' 
    243  
    244          CAUTION :  there is a need to homogenize the definition of constant for sea-ice at least between LIM-2 and LIM-3. This must be coordonated with CICE variables 
    245  
    246  
    247 ==== (2) LIM-3 specific changes  see '''revision XXXX''' ====  
    248  
    249    In LIM3 case, the problem is somewhat different. Indeed, LIM3 is written in an energy conserving way (Bitz & Lipscomb 1999). Therefore the heat exchanged in both atmosphere and ocean is the internal energy (i.e. the heat flux through the interface + the heat content of the mass flux referenced to rt0). There is no need to introduce rdq_ice and rdq_snw fields.   
    250  
    251    Five key elements have been changed : 
    252  
    253    '''1- Addition of internal energy of snowfall over the ice'''.  
    254    Reason:  Tatm is used inside lim3 to compute the internal energy of snowfall. In coupled mode this will not be possible. Therefore, and in better agreement with SBC philosophy, we introduce qen_snw provided by sbcblk_c.. or sbccpl. 
    255  
    256       • '''sbc_ice.F90''' : add the internal energie of snow in both LIM2 and LIM3 cases (even if in lim3 it will not be used) : 
     221    z1_rau0   implies changes in '''   dynzdf_exp.F90'''      ;   '''   dynzdf_imp.F90'''      and   '''   eosbn2.F90''' 
     222 
     223  r1_rau0_rcp   implies changes in '''   trabbc.F90'''      ;   '''   traqsr.F90'''      and   '''   eosbn2.F90''' 
     224 
     225  CAUTION :  there is a need to homogenize the definition of constant for sea-ice at least between LIM-2 and LIM-3. This must be coordonated with CICE variables 
     226 
     227==== (2) LIM-3 specific changes  see !'''revision XXXX!''' ==== 
     228  In LIM3 case, the problem is somewhat different. Indeed, LIM3 is written in an energy conserving way (Bitz & Lipscomb 1999). Therefore the heat exchanged in both atmosphere and ocean is the internal energy (i.e. the heat flux through the interface + the heat content of the mass flux referenced to rt0). There is no need to introduce rdq_ice and rdq_snw fields. 
     229 
     230  Five key elements have been changed : 
     231 
     232  '''   1- Addition of internal energy of snowfall over the ice'''   .  Reason:  Tatm is used inside lim3 to compute the internal energy of snowfall. In coupled mode this will not be possible. Therefore, and in better agreement with SBC philosophy, we introduce qen_snw provided by sbcblk_c.. or sbccpl. 
     233 
     234  • '''   sbc_ice.F90'''    : add the internal energie of snow in both LIM2 and LIM3 cases (even if in lim3 it will not be used) : 
    257235{{{ 
    258236   REAL(wp), PUBLIC, DIMENSION(jpi,jpj) ::   qen_snw     !: internal energy of snowfall (heat content - Latent)   [W/m2] 
    259237}}} 
    260          idem in thd_ice ( version _1d) 
    261  
    262       • '''sbcice_lim.F90, sbcblk_core.F90 and sbcblk_clio.F90''' : add qen_snw to the call argument of blk_ice_c..., and add its computation (p_qen_s) in the 2 bulk formulae module: 
     238    idem in thd_ice ( version _1d) 
     239 
     240  • '''   sbcice_lim.F90, sbcblk_core.F90 and sbcblk_clio.F90'''    : add qen_snw to the call argument of blk_ice_c..., and add its computation (p_qen_s) in the 2 bulk formulae module: 
    263241{{{ 
    264242      p_qen_s(:,:) = sf(jp_snow)%fnow(:,:) * ( cpic * ( sf(jp_tair)%fnow(:,:) - rtt - lfus ) 
    265243}}} 
    266   
    267      • '''sbccpl.F90''' :  add the computation of qen_snw 
     244 
     245  • '''   sbccpl.F90'''    :  add the computation of qen_snw 
     246 
    268247CAUTION : BUG correction snow CP is cpic not rcp....   correction made. 
    269248 
    270       • '''limthd.F90, limthd_ent.F90 and limthd_dh''' :  pass qen_snw from 2D to 1D in limthd, replace the use of tatm by the use of qen_snw in limthd_dh : 
     249  • '''   limthd.F90, limthd_ent.F90 and limthd_dh'''    :  pass qen_snw from 2D to 1D in limthd, replace the use of tatm by the use of qen_snw in limthd_dh : 
    271250{{{ 
    272251!!gm          p_qen_s(:,:) = sf(jp_snow)%fnow(:,:) * ( cpic * ( sf(jp_tair)%fnow(:,:) - rtt ) - lfus ) 
     
    276255!!gm 
    277256}}} 
    278       and in limthd_ent : 
     257  and in limthd_ent : 
    279258{{{ 
    280259!!gm          p_qen_s(:,:) = sf(jp_snow)%fnow(:,:) * ( cpic * ( sf(jp_tair)%fnow(:,:) - rtt ) - lfus ) 
     
    288267!!gm 
    289268}}} 
    290       as a consequence, the declaration of tatm in key_lim3 case is suppressed from sbc_ice, and its initialisation from both sbcblk_core and clio. 
    291  
    292       NB: in clio bulk, we replace the 2D ztatm array by a local scalar ztair 
    293  
     269  as a consequence, the declaration of tatm in key_lim3 case is suppressed from sbc_ice, and its initialisation from both sbcblk_core and clio. 
     270 
     271  NB: in clio bulk, we replace the 2D ztatm array by a local scalar ztair 
    294272 
    295273'''OPEN QUESTION ==>'''   Sublimation in coupled mode  !!!!      ===>>> Seb and Martin help required 
     
    297275'''OPEN QUESTION ==>'''   Coupled mode check the value of cpic used in the atmosphere as well as rcp !!! :-) 
    298276 
    299  
    300  
    301    '''2- Change in the snowfall partition between leads and ice'''.  
    302    Reason: in LIM3 part of the snow that fall over ice is transported by the wind and kept in lead area. The parameterisation in coded deeply in LIM3 routine, whereas in coupled mode we need to have the information in sbccpl. Furthermore, with the partitioning at sbc level, LIM2 can also benefite from it. 
    303  
    304    Introduce betas in the SBC, no more in LIM-3 alone. 
    305  
    306    '''reason (1) :''' make it available in coupled mode (sbccpl.F90 will have to use it)  ==>> Following change in LIM3 & sbccpl 
    307  
    308      • '''sbc_oce.F90,sbcmod.F90, ice.F90 ''' : in namelist namsbc, add the following variable: 
     277  '''   2- Change in the snowfall partition between leads and ice'''   .  Reason: in LIM3 part of the snow that fall over ice is transported by the wind and kept in lead area. The parameterisation in coded deeply in LIM3 routine, whereas in coupled mode we need to have the information in sbccpl. Furthermore, with the partitioning at sbc level, LIM2 can also benefite from it. 
     278 
     279  Introduce betas in the SBC, no more in LIM-3 alone. 
     280 
     281  '''   reason (1) :'''    make it available in coupled mode (sbccpl.F90 will have to use it)  ==>> Following change in LIM3 & sbccpl 
     282 
     283  • '''   sbc_oce.F90,sbcmod.F90, ice.F90 '''    : in namelist namsbc, add the following variable: 
    309284{{{ 
    310285   REAL(wp), PUBLIC ::   rn_psnw     = 1.e0      !: coef. of lead/ice partition of snowfall (>0 and <=1) 
    311286}}} 
    312       add the lecture of the new variable and its print in sbcmod.F90 and  remove the old variable (betas) from ice.F90 
    313  
    314        '''namelist  ==>  DON'T FORGET TO  add the new variable in the ocean ref namsbc namelists !!! ''' 
    315        '''namelist  ==>  DON'T FORGET TO  remove betas from the lim3 ref namicethd namelists !!! ''' 
    316  
    317      • '''limthd.F90 ''' : remove the lecture from namicethd namelist. Change the budget over lead from: 
     287    add the lecture of the new variable and its print in sbcmod.F90 and  remove the old variable (betas) from ice.F90 
     288 
     289  '''   namelist  ==>  DON'T FORGET TO  add the new variable in the ocean ref namsbc namelists !!! '''   '''   namelist  ==>  DON'T FORGET TO  remove betas from the lim3 ref namicethd namelists !!! ''' 
     290 
     291  • '''   limthd.F90 '''    : remove the lecture from namicethd namelist. Change the budget over lead from: 
    318292{{{ 
    319293            zfontn         = sprecip(ji,jj) * lfus              ! energy of melting 
     
    324298               &                               * ( 1.0 - at_i(ji,jj) ) * rdt_ice     
    325299}}} 
    326       to the following lines: (with za_i = at_i  ; and za_o = 1 - at_i = pfrld 
     300    to the following lines: (with za_i = at_i  ; and za_o = 1 - at_i = pfrld 
    327301{{{ 
    328302            ! snowfall is partitionned between leads and ice. If snow fall was uniform,  
     
    363337!!gm end 
    364338}}} 
    365       Notes : (1) we now update here the snow partition between ice and ocean. (2) both qen_snw and sprecip are modified: suppression of partitioning in other limthd_... modules. (3) the line starting with the comment '!!gm ?' is there to emphasise a potential '''BUG'''. Potential because I'm not completely sure. see just below.  (4) this include a bug correction, see just below: 
    366  
    367          '''BUG''' correction : In LIM-3 a betas exponent has been introduced when computing the solid precipitation over the sea ice. Part of the snow that falls over sea-ice is put in the lead areas by the wind. Nevertheless, the latent heat flux due to snow melting is computed with sprecip *(1-at_i) whereas the actual solid precipitation over lead area is sprecip*(1-at_i**betas).  If betas /=1, some latent heat is missing (see the ticket open on that purpose #670). 
    368  
    369          '''POTENTIAL BUG''' It seems to me that the among of heat exchange through turbulent fluxes between the ice and the ocean should be fdtcn(ji,jj) *   za_i, and not fdtcn(ji,jj) *   za_o. Indeed the ice-ocean surface of contact is proportional to at_i (=za_i), not za_o !    '''===>> TO BE CHECKED with Martin''' 
    370  
    371      • '''limthd_dh.F90 ''' : remove the snow partitioning: lines 
     339    Notes : (1) we now update here the snow partition between ice and ocean. (2) both qen_snw and sprecip are modified: suppression of partitioning in other limthd_... modules. (3) the line starting with the comment '!!gm ?' is there to emphasise a potential '''   BUG'''   . Potential because I'm not completely sure. see just below.  (4) this include a bug correction, see just below: 
     340 
     341  '''   BUG'''    correction : In LIM-3 a betas exponent has been introduced when computing the solid precipitation over the sea ice. Part of the snow that falls over sea-ice is put in the lead areas by the wind. Nevertheless, the latent heat flux due to snow melting is computed with sprecip *(1-at_i) whereas the actual solid precipitation over lead area is sprecip*(1-at_i**betas).  If betas /=1, some latent heat is missing (see the ticket open on that purpose #670   ). 
     342 
     343  '''   POTENTIAL BUG'''    It seems to me that the among of heat exchange through turbulent fluxes between the ice and the ocean should be fdtcn(ji,jj) *   za_i, and not fdtcn(ji,jj) *   za_o. Indeed the ice-ocean surface of contact is proportional to at_i (=za_i), not za_o !    '''   ===>> TO BE CHECKED with Martin''' 
     344 
     345  • '''   limthd_dh.F90 '''    : remove the snow partitioning: lines 
    372346{{{ 
    373347         zcoeff = ( 1.0 - ( 1.0 - at_i_b(ji) )**betas ) / at_i_b(ji)  
    374348         zdh_s_pre(ji) = zcoeff * sprecip_1d(ji) * rdt_ice / rhosn 
    375349}}} 
    376       becomes : 
     350    becomes : 
    377351{{{ 
    378352         zdh_s_pre(ji) = sprecip_1d(ji) * rdt_ice / rhosn 
    379353}}} 
    380354 
    381      • '''limsbc.F90 ''' : remove the lecture from namicethd namelist. Change the budget over lead from: 
     355  • '''   limsbc.F90 '''    : remove the lecture from namicethd namelist. Change the budget over lead from: 
    382356{{{ 
    383357               &   + sprecip(ji,jj) * ( 1. - pfrld(ji,jj)**betas )  &    ! remove snow is intercepted by sea-ice (previous frld) 
    384358}}} 
    385       becomes : 
     359    becomes : 
    386360{{{ 
    387361               &   + sprecip(ji,jj) * ( 1. - pfrld(ji,jj) )       ! remove snow intercepted by sea-ice (before thermo) 
    388362}}} 
    389363 
    390      • '''sbccpl.F90 ''' : add the partitioning of snow : 
    391  
    392    '''reason (2) :''' make it also avalable in LIM-2.  ==>> the Following change is LIM-2 
    393  
    394      • '''limthd_2.F90 ''' : remove the lecture from namicethd namelist. Change the budget over lead from: 
    395  
    396  
    397    '''3- Modify the salt flux computation from an equivalent freshwater flux to a salt flux''' 
    398  
    399    '''4- update the ice-ocean interface to salt flux''' 
    400  
    401    '''5- Add the coupled case in the interface ice-atmos and atmos-ocean''' 
    402  
    403  
    404  
    405         '''BUG''' correction : limthd : use fse3t_m instead of fse3t 
    406  
    407       '''==>> ONGOING work''' 
    408  
    409 ==== (3) Non-solar flux including the heat content of mass exchanges  (see '''revision 1859''') ====  
    410  
    411    the definition of qns is modified as follows: the non solar part of the surface heat flux takes now also into account the heat content changes due to the change in volume associated with evaporation, precipitation, ice freezing and ice melting. This heat content is evaluated using the temperature (expressed in Celcius) of the mass of water exchanged between the different media (ocean, atmosphere and ice).  
    412  
    413    Note that the latent heat flux associated to the meltin of solid precipitation is now taken into account directly in qns in sbc... routines, instead of been added in limthd(_2) (cf. step (1)) 
    414  
    415    • ocean-atmosphere mass exchanges :   
    416  
    417       # liquid precipitation are assumed to be at the air temperature expressed in Celcius) 
    418  
    419       # solid precipitation are assumed to be at least below the the melting temperature of snow (rtt_snow) : min( Tair , rtt_snow ) 
    420  
    421       # evaporation are at the SST. Note that sst_m is used. This is thus different from the former implicit value assumed for both precip and evap (use of tn in trasbc.F90) 
    422  
    423  
    424       We therefore need to add the air temperature to the sea-ice, change the definition of emps (now a salt flux), and add the heat content of the mass flux (emp) to the non-solar heat flux. The associated modified modules are : sbcmod.F90 ; sb 
    425  
    426       • '''sbcmod.F90''' : initialize emps to zero. The following lines have been added 
     364  • '''   sbccpl.F90 '''    : add the partitioning of snow : 
     365 
     366  '''   reason (2) :'''    make it also avalable in LIM-2.  ==>> the Following change is LIM-2 
     367 
     368  • '''   limthd_2.F90 '''    : remove the lecture from namicethd namelist. Change the budget over lead from: 
     369 
     370  '''   3- Modify the salt flux computation from an equivalent freshwater flux to a salt flux''' 
     371 
     372  '''   4- update the ice-ocean interface to salt flux''' 
     373 
     374  '''   5- Add the coupled case in the interface ice-atmos and atmos-ocean''' 
     375 
     376  '''   BUG'''    correction : limthd : use fse3t_m instead of fse3t 
     377 
     378  '''   ==>> ONGOING work''' 
     379 
     380==== (3) Non-solar flux including the heat content of mass exchanges  (see !'''revision 1859!''') ==== 
     381  the definition of qns is modified as follows: the non solar part of the surface heat flux takes now also into account the heat content changes due to the change in volume associated with evaporation, precipitation, ice freezing and ice melting. This heat content is evaluated using the temperature (expressed in Celcius) of the mass of water exchanged between the different media (ocean, atmosphere and ice). 
     382 
     383  Note that the latent heat flux associated to the meltin of solid precipitation is now taken into account directly in qns in sbc... routines, instead of been added in limthd(_2) (cf. step (1)) 
     384 
     385  • ocean-atmosphere mass exchanges : 
     386 
     387  # liquid precipitation are assumed to be at the air temperature expressed in Celcius) 
     388 
     389  # solid precipitation are assumed to be at least below the the melting temperature of snow (rtt_snow) : min( Tair , rtt_snow ) 
     390 
     391  # evaporation are at the SST. Note that sst_m is used. This is thus different from the former implicit value assumed for both precip and evap (use of tn in trasbc.F90) 
     392 
     393  We therefore need to add the air temperature to the sea-ice, change the definition of emps (now a salt flux), and add the heat content of the mass flux (emp) to the non-solar heat flux. The associated modified modules are : sbcmod.F90 ; sb 
     394 
     395  • '''   sbcmod.F90'''    : initialize emps to zero. The following lines have been added 
    427396{{{ 
    428397      emps(:,:) = 0.e0                             ! the salt flux will be computed (i.e. will be non-zero) only if  
     
    430399}}} 
    431400 
    432       • '''sbcblk_core.F90''' : add in qns the latent flux of solid precipitation + heat content of precip. and evap. In blk_oce_core routine, the following lines 
     401  • '''   sbcblk_core.F90'''    : add in qns the latent flux of solid precipitation + heat content of precip. and evap. In blk_oce_core routine, the following lines 
    433402{{{ 
    434403!CDIR COLLAPSE 
     
    437406      emp (:,:) = zevap(:,:) - sf(jp_prec)%fnow(:,:) * rn_pfac * tmask(:,:,1) 
    438407}}} 
    439       becomes 
     408  becomes 
    440409{{{ 
    441410!CDIR COLLAPSE 
     
    454423}}} 
    455424 
    456       • '''sbcblk_clio.F90''' : add in qns the latent flux of solid precipitation (only if sea-ice present, otherwise the solid precipitation are not computed) + heat content of precip. and evap. In  blk_oce_clio routine, the following lines 
     425  • '''   sbcblk_clio.F90'''    : add in qns the latent flux of solid precipitation (only if sea-ice present, otherwise the solid precipitation are not computed) + heat content of precip. and evap. In  blk_oce_clio routine, the following lines 
    457426{{{ 
    458427!CDIR COLLAPSE 
     
    467436      emps(:,:) = emp(:,:) 
    468437}}} 
    469       becomes 
     438  becomes 
    470439{{{ 
    471440      zcevap = rcp /  cevap    ! convert zqla ==> evap (Kg/m2/s) ==> m/s ==> W/m2 
     
    484453      ! NB: if sea-ice model, the snow precip are computed and the associated heat is added to qns (see blk_ice_clio) 
    485454}}} 
    486       and in blk_ice_clio, add the following lines: 
     455  and in blk_ice_clio, add the following lines: 
    487456{{{ 
    488457      ! ----------------------------------------------------------------------------- ! 
     
    496465}}} 
    497466 
    498       • '''sbccpl.F90''' : the latent flux of solid precipitation is already taken into account. The heat content of the mass flux [precip. - evap (-runoff) (-calving)] should be added but only over open ocean (the modification does not concern the surface ice fluxes). It is not a simple story. To be perfectly conservative between atmos. and ocean, the atmosphere should provide the heat content associated with the mass flux. This is not done with the current atmospheric component used. Therefore an approximation should be done: 
    499  
    500       # evaporation :  Since the atmosphere has seen the mean SST over the last coupling time interval. This previous SST is the one that should be used to compute the heat content of evaporation. It is not available but can be added to sbcssm module and in its restart. For the moment, we simply use the sst_m field. 
    501  
    502       # precipitation : as in former forced runs, the temperature of precipitation is assumed to be at the SST: we use sst_m field. 
    503  
    504       # runoff & calving : use sst_m as we have no better information 
    505  
    506       In  sbc_cpl_rcv routine (ocean-atmos. only), move the emp part before the qns part and add the following lines 
     467  • '''   sbccpl.F90'''    : the latent flux of solid precipitation is already taken into account. The heat content of the mass flux [precip. - evap (-runoff) (-calving)] should be added but only over open ocean (the modification does not concern the surface ice fluxes). It is not a simple story. To be perfectly conservative between atmos. and ocean, the atmosphere should provide the heat content associated with the mass flux. This is not done with the current atmospheric component used. Therefore an approximation should be done: 
     468 
     469  # evaporation :  Since the atmosphere has seen the mean SST over the last coupling time interval. This previous SST is the one that should be used to compute the heat content of evaporation. It is not available but can be added to sbcssm module and in its restart. For the moment, we simply use the sst_m field. 
     470 
     471  # precipitation : as in former forced runs, the temperature of precipitation is assumed to be at the SST: we use sst_m field. 
     472 
     473  # runoff & calving : use sst_m as we have no better information 
     474 
     475  In  sbc_cpl_rcv routine (ocean-atmos. only), move the emp part before the qns part and add the following lines 
    507476{{{ 
    508477         zcoef = xlsn / rhosn                                    ! qns update over free ocean with: 
     
    511480}}} 
    512481 
    513       In  sbc_cpl_ice_flx routine (ocean-atmos-ice), the following lines 
     482  In  sbc_cpl_ice_flx routine (ocean-atmos-ice), the following lines 
    514483{{{ 
    515484      IF( lk_diaar5 )   zcptn(:,:) = rcp * tn(:,:,1) 
     
    519488      pqns_tot(:,:) = pqns_tot(:,:) - ztmp(:,:) 
    520489}}} 
    521       becomes 
     490  becomes 
    522491{{{ 
    523492      zcptn(:,:) = rcp * sst_m(:,:) 
     
    531500}}} 
    532501 
    533       • '''sbcana.F90 ; sbcflx.F90 ; sbcfwb.F90 ; sbcrnf.F90''' : add in qns the heat content of the mass flux taken at SST. immediate changes 
    534  
    535       • '''sbcssr''' : add a change in qns if the SSS restoring is converted into an emp ; update emps as a salt flux is SSS restoring is just a salinity restoring term 
    536  
    537  
    538  
    539  
    540  
    541  
    542  
    543 ==== (4) Update ocean forcing  and ice forcing ====  
    544  
    545    see '''revision 1859''' except for LIM-3 (limsbc.F90) updated in '''revision XXXX'''  
    546  
    547    Modification of trasbc and limsbc(_2) modules in order to take into account the above changes (heat content of water exchanges (LIM2) and explicit salt flux (LIM2 & 3) and coupled interface for LIM3) 
    548  
    549    • ocean-atmosphere mass exchanges :  In the un-approximated case (lk_vvl=T) the ocean receives at its surface (1) a salt flux associate with Freezing and Melting of sea-ice, and (2) a heat flux which includes the budget of the heat content of all mass exchanged with the atmosphere and sea-ice. In the linear free surface case (lk_vvl=F), the model volume of the ocean is assumed to be constant, therefore an extra term appears in both T and S forcing term, the concentration/dilution term : the volume (associated to mass flux) removed or add to the ocean is replaced by a same volume of ocean water at Tn and Sn, so that the model ocean volume remains constant. 
    550  
    551       '''trasbc.F90''' T and S forcing terms becomes symmetric. The following lines : 
     502  • '''   sbcana.F90 ; sbcflx.F90 ; sbcfwb.F90 ; sbcrnf.F90'''    : add in qns the heat content of the mass flux taken at SST. immediate changes 
     503 
     504  • '''   sbcssr'''    : add a change in qns if the SSS restoring is converted into an emp ; update emps as a salt flux is SSS restoring is just a salinity restoring term 
     505 
     506==== (4) Update ocean forcing  and ice forcing ==== 
     507  see '''   revision 1859'''    except for LIM-3 (limsbc.F90) updated in '''   revision XXXX''' 
     508 
     509  Modification of trasbc and limsbc(_2) modules in order to take into account the above changes (heat content of water exchanges (LIM2) and explicit salt flux (LIM2 & 3) and coupled interface for LIM3) 
     510 
     511  • ocean-atmosphere mass exchanges :  In the un-approximated case (lk_vvl=T) the ocean receives at its surface (1) a salt flux associate with Freezing and Melting of sea-ice, and (2) a heat flux which includes the budget of the heat content of all mass exchanged with the atmosphere and sea-ice. In the linear free surface case (lk_vvl=F), the model volume of the ocean is assumed to be constant, therefore an extra term appears in both T and S forcing term, the concentration/dilution term : the volume (associated to mass flux) removed or add to the ocean is replaced by a same volume of ocean water at Tn and Sn, so that the model ocean volume remains constant. 
     512 
     513  '''   trasbc.F90'''    T and S forcing terms becomes symmetric. The following lines : 
    552514{{{ 
    553515      DO jj = 2, jpj 
     
    569531      END DO 
    570532}}} 
    571       becomes 
     533  becomes 
    572534{{{ 
    573535      IF( lk_vvl ) THEN          ! Variable Volume Layers case   ===>> heat content of mass flux in qns 
     
    593555}}} 
    594556 
    595  
    596    • ocean-ice mass exchanges :   
    597  
    598       Ice-IF : '''sbcice_if.F90''' : no changes except style as there is no mass flux exchanges in ice-if case.  
    599  
    600       LIM-2 : '''limsbc_2.F90''' :   
     557  • ocean-ice mass exchanges : 
     558 
     559  Ice-IF : '''   sbcice_if.F90'''    : no changes except style as there is no mass flux exchanges in ice-if case. 
     560 
     561  LIM-2 : '''   limsbc_2.F90'''    : 
    601562{{{ 
    602563.... lot of things.... 
    603564}}} 
    604       becomes 
     565  becomes 
    605566{{{ 
    606567            ! 
     
    658619}}} 
    659620 
    660       LIM-3 : '''limsbc.F90''' :  see '''revision XXX'''.  
    661          Add soce_r and sice_r  as in LIM-2 case 
    662  
    663          In routine '''lim_sbc_flx''' the computation of the heat, salt and mass fluxes has been completely revisited. In particular, the coupled case should be now OK, except for the albedo computation which has to be checked. 
    664  
    665          The heat flux is now computed as follows:   '''    ===>>>> CAUTION  heat content still not added ! ''' 
     621  LIM-3 : '''   limsbc.F90'''    :  see '''   revision XXX'''   . 
     622    Add soce_r and sice_r  as in LIM-2 case 
     623 
     624  In routine '''   lim_sbc_flx'''    the computation of the heat, salt and mass fluxes has been completely revisited. In particular, the coupled case should be now OK, except for the albedo computation which has to be checked. 
     625 
     626  The heat flux is now computed as follows:   '''       ===>>>> CAUTION  heat content still not added ! ''' 
    666627{{{ 
    667628            ! 
     
    714675}}} 
    715676 
    716          The mass and salt fluxes are now computed as follows:  
     677  The mass and salt fluxes are now computed as follows: 
    717678{{{ 
    718679            !==  mass flux at the ocean-atmosphere interface  ==!   (open ocean fraction = leads area) 
     
    752713}}} 
    753714 
    754  
    755 '''(4) change emp and emps names'''  
    756  
    757    The emps field is suppress by introducing '''fsalt''', the salt flux at the ocean surface (only non zero below sea-ice) 
    758  
    759    A symmetric name is chosen for the emp : '''fmass'''. Indeed emp is a mass flux expressed in Kg/m^2^/s. its name emp is miss leading: emp does not only represent the Evaporation minus Precipitation budget, as it also include the freezing or melting of sea-ice, and also sometime the runoff. Therefore using fmass appears more meaningful. 
    760  
    761    in case of linear free surface (no key_vvl defined), the salt flux take into account the concentration/dilution term 
    762  
    763  
    764 '''(5) update other parts of the system : C1D_SRC ; NST_SRC ; OFF_SRC ; TOP_SRC ...''  
    765  
     715'''(4) change emp and emps names''' 
     716 
     717  The emps field is suppress by introducing '''   fsalt'''   , the salt flux at the ocean surface (only non zero below sea-ice) 
     718 
     719  A symmetric name is chosen for the emp : '''   fmass'''   . Indeed emp is a mass flux expressed in Kg/m^   2^   /s. its name emp is miss leading: emp does not only represent the Evaporation minus Precipitation budget, as it also include the freezing or melting of sea-ice, and also sometime the runoff. Therefore using fmass appears more meaningful. 
     720 
     721  in case of linear free surface (no key_vvl defined), the salt flux take into account the concentration/dilution term 
     722 
     723'''(5) update other parts of the system : C1D_SRC ; NST_SRC ; OFF_SRC ; TOP_SRC ...'' ''''' 
    766724 
    767725'''CAUTION''' : limsbc_2 : Baltic sea ice salinity changed from 2 PSU to 0.5 PSU !!!!  change in limsbc.F90 to be done. Furthermore, only the orca2 case has been coded. All other orca configurations are missing.  This should be introduce by a lat/lon definition of the baltic area. 
    768726 
    769727'''N.B.''' 
    770    • LIM-3 needs the air temperature ...  This is related to the heat content change when Melting the fallen snow.  Think how to take this in a different way, so that in coupled mode it works ! 
    771  
    772    • introduce (as was done for sea-ice embedment) the air temperature as an argument of both blk_ice_core and blk_ice_clio routines 
    773  
    774    • Philosophical change: in near future it appears that the use of key_vvl should be replaced by key_linssh. In other words, the defaut option of NEMO will be a non-linear free surface (and thus variable volume for the model levels). This has to be discussed prior to its implementation. 
    775  
    776    • In the same idea : the embedded sea-ice should become the defaut case, with in option the 2 levitating cases. A test should then force a levitating sea-ice if key_linssh defined 
    777  
    778    • Idea for LIM-3 optimisation : instead of 2D => 1D transformation, is it possible to introduce a 3D (including ice categories) => 1D transformation. Gain: longer vector so clear in vector computer, less obvious on scalar one, except that the limthd... will become 1 gigantic done loop => better also for scalar. 
     728 
     729  • LIM-3 needs the air temperature ...  This is related to the heat content change when Melting the fallen snow.  Think how to take this in a different way, so that in coupled mode it works ! 
     730 
     731  • introduce (as was done for sea-ice embedment) the air temperature as an argument of both blk_ice_core and blk_ice_clio routines 
     732 
     733  • Philosophical change: in near future it appears that the use of key_vvl should be replaced by key_linssh. In other words, the defaut option of NEMO will be a non-linear free surface (and thus variable volume for the model levels). This has to be discussed prior to its implementation. 
     734 
     735  • In the same idea : the embedded sea-ice should become the defaut case, with in option the 2 levitating cases. A test should then force a levitating sea-ice if key_linssh defined 
     736 
     737  • Idea for LIM-3 optimisation : instead of 2D => 1D transformation, is it possible to introduce a 3D (including ice categories) => 1D transformation. Gain: longer vector so clear in vector computer, less obvious on scalar one, except that the limthd... will become 1 gigantic done loop => better also for scalar. 
    779738 
    780739'''CAUTION''' 
    781740 
    782    • in coupled mode, the atmosphere and the ocean must share the same latent heat flux of solid precipitation 
    783  
    784    • in coupled mode, the atmosphere should provide not only the mass flux [e-p(-runoff)(-calvin)] but also the heat content associated with this mass flux computed with a temperature in Celcius. 
     741  • in coupled mode, the atmosphere and the ocean must share the same latent heat flux of solid precipitation 
     742 
     743  • in coupled mode, the atmosphere should provide not only the mass flux [e-p(-runoff)(-calvin)] but also the heat content associated with this mass flux computed with a temperature in Celcius. 
     744 
     745= LIM-3 changes (oct 2012, !r3517) = 
     746Changes done in LIM3 : 
     747 
     7481- '''Almost all routines'''  :  r1_rdtice = 1 / rdt_ice has been introduced in ice.F90 and is used systematically in all LIM3 routines (multiplication instead of a division) 
     749 
     7502- salinity related ice routine : case num_sal=4 and 5 has been suppressed. They were test cases for on of Martin's papers. Useless in the reference version[[BR]]this involves changes in : ice.F90 ; limitd_me, limited_th, limsbc, limthd_dh, .... 
     751 
     7523- Change equivalente freshwater fluxes into a salt flux and a mass flux (similar to a volume flux in boussinesq approx.) 
     753 
     754'''limsbc.F90''' : large changes: 
     755 
     756'''limitd_me.F90''' : lim_itd_me_ridgeshift subroutine. After the following lines: 
     757 
     758{{{ 
     759           !-----------------------------------------------------------------  
     760           ! 3.5) Compute properties of new ridges       
     761           !-----------------------------------------------------------------  
     762           !-------------  
     763           ! Salinity    
     764           !-------------   
     765           smsw(ji,jj)  = sss_m(ji,jj) * vsw(ji,jj) * rhoic / rau0       ! salt content of water frozen in voids  
     766 
     767           zsrdg2       = srdg1(ji,jj) + smsw(ji,jj)                     ! salt content of new ridge     
     768 
     769           srdg2(ji,jj) = MIN( s_i_max * vrdg2(ji,jj) , zsrdg2 )         ! impose a maximum salinity     
     770 
     771           !                                                             ! excess of salt is flushed into the ocean                                                     
     772           fsalt_rpo(ji,jj) = fsalt_rpo(ji,jj) + ( zsrdg2 - srdg2(ji,jj) ) * rhoic / rdt_ice  
     773}}} 
     774we add the associated mass flux (from the ocean to sea ice) that is now required to specified 
     775 
     776{{{ 
     777           rdm_ice(ji,jj) = rdm_ice(ji,jj) + vsw(ji,jj) * rhoic / rau0   ! increase in ice volume du to seawater frozen in voids  
     778}}} 
     779'''limthd_dh.F90''': the following concentration dilution term (or virtual salt flux) 
     780 
     781{{{ 
     782            ! contribution to ice-ocean salt flux        
     783            zji = MOD( npb(ji) - 1 , jpi ) + 1   
     784            zjj =    ( npb(ji) - 1 ) / jpi + 1            
     785            zfsalt_melt(ji) = zfsalt_melt(ji) + ( sss_m(zji,zjj) - sm_i_b(ji) ) * a_i_b(ji)    &                  
     786               &                              * MIN( zdeltah(ji,jk) , 0.e0 ) * rhoic / rdt_ice           
     787}}} 
     788becomes a pure salt flux: 
     789 
     790{{{ 
     791            ! contribution to ice-ocean salt flux        
     792           zfsalt_melt(ji)  = zfsalt_melt(ji) - sm_i_b(ji) * a_i_b(ji) * MIN( zdeltah(ji,jk) , 0._wp ) * rhoic * r1_rdtice   
     793}}} 
     794similar changes in to other places of the routine (lines 470's, 590's, 650's) 
     795 
     796== Remarks and TODO list: == 
     797to be done:  change the name of the salt fluxes: 
     798 
     799  fsalt_res          ==>                sfx_res[[BR]]          fsbri                ==>                sfx_bri[[BR]]          fsalt_rpo        ==>                sfx_rpo[[BR]]          fseqv                ==>                sfx_f_m  or sfx_fmm 
     800 
     801Same hold for heat flux names that should start with qice_...  ? 
     802 
     803introduce in phycst.F90  r1_rau0 = 1 / rau0  and use it every where in both OPA and LIM3 
     804 
    785805---- 
    786806=== Testing === 
    787807Testing could consider (where appropriate) other configurations in addition to NVTK]. 
    788808 
    789 ||NVTK Tested||!'''YES/NO!'''|| 
    790 ||Other model configurations||!'''YES/NO!'''|| 
    791 ||Processor configurations tested||[ Enter processor configs tested here ]|| 
    792 ||If adding new functionality please confirm that the [[BR]]New code doesn't change results when it is switched off [[BR]]and !''works!'' when switched on||!'''YES/NO/NA!'''|| 
     809|| NVTK Tested || !'''YES/NO!''' || 
     810|| Other model configurations || !'''YES/NO!''' || 
     811|| Processor configurations tested || [ Enter processor configs tested here ] || 
     812|| If adding new functionality please confirm that the [[BR]]New code doesn't change results when it is switched off [[BR]]and !''works!'' when switched on || !'''YES/NO/NA!''' || 
    793813 
    794814(Answering UNSURE is likely to generate further questions from reviewers.) 
     
    800820 
    801821=== Bit Comparability === 
    802 ||Does this change preserve answers in your tested standard configurations (to the last bit) ?||!'''YES/NO !'''|| 
    803 ||Does this change bit compare across various processor configurations. (1xM, Nx1 and MxN are recommended)||!'''YES/NO!'''|| 
    804 ||Is this change expected to preserve answers in all possible model configurations?||!'''YES/NO!'''|| 
    805 ||Is this change expected to preserve all diagnostics? [[BR]]!,,!''Preserving answers in model runs does not necessarily imply preserved diagnostics. !''||!'''YES/NO!'''|| 
     822|| Does this change preserve answers in your tested standard configurations (to the last bit) ? || !'''YES/NO !''' || 
     823|| Does this change bit compare across various processor configurations. (1xM, Nx1 and MxN are recommended) || !'''YES/NO!''' || 
     824|| Is this change expected to preserve answers in all possible model configurations? || !'''YES/NO!''' || 
     825|| Is this change expected to preserve all diagnostics? [[BR]]!,,!''Preserving answers in model runs does not necessarily imply preserved diagnostics. !'' || !'''YES/NO!''' || 
    806826 
    807827If you answered !'''NO!''' to any of the above, please provide further details: 
     
    815835---- 
    816836=== System Changes === 
    817 ||Does your change alter namelists?||!'''YES/NO !'''|| 
    818 ||Does your change require a change in compiler options?||!'''YES/NO !'''|| 
     837|| Does your change alter namelists? || !'''YES/NO !''' || 
     838|| Does your change require a change in compiler options? || !'''YES/NO !''' || 
    819839 
    820840If any of these apply, please document the changes required here....... 
     
    826846---- 
    827847=== IPR issues === 
    828 ||Has the code been wholly (100%) produced by NEMO developers staff working exclusively on NEMO?||!'''YES/ NO !'''|| 
     848|| Has the code been wholly (100%) produced by NEMO developers staff working exclusively on NEMO? || !'''YES/ NO !''' || 
    829849 
    830850If No: