Announcement of NEMO release 4.0.4
We are pleased to announce the "minor" 4.0.4 release, now available here:
https://forge.ipsl.jussieu.fr/nemo/browser/NEMO/releases/r4.0/r4.0.4
This 4.0.4 release is based on 4.0.2 and includes several new features, improvements and debugs. We strongly encourage all the teams to upgrade to this version. The main changes (vs 4.0.2) are described hereafter:
SI3:
New physics controlled by a namelist parameter:
- Parameterization of frozen lids on top of melt ponds => ln_pnd_lids
- Fraction of ice covered by snow can be dependent on snow thickness. It impacts albedo and solar flux transmitted thru the ice. There are 3 options: nn_snwfra=0 (basic 0-1, as before), nn_snwfra=1 (MetO-Jules formulation), nn_snwfra=2 (CICE formulation).
- Solar flux transmission thru the surface scattering layer. There are 2 options: nn_qtrice=0 (transmission depends on cloudiness and is 0 where there is snow, as before), nn_qtrice=1 (from M. Lebrun thesis 2019: transmission is 0.3 everywhere but with different snow conductivities during melting and freezing)
Enhancements controlled by a namelist parameter:
- Initialise sea ice from multi category restart file => nn_iceini_file=2
- read the cloud cover to improve ice albedo calculation (forced simulations only for now)
- control of convergences for rheology (EVP and aEVP) and heat diffusion (Bitz and Lipscomb 99) schemes => nn_rhg_chkcvg and ln_zdf_chkcvg
- maximum ice thickness allowed (99m by default) => rn_himax
- heat in the leads can be used to warm the ocean before melting sea-ice but probably not a good idea (cf Ed) => ln_leadhfx
Hard coded developments and debugs:
- major debug of aEVP (critical)
- penetration of solar radiation thru the ice and snow does not include the surface scattering layer anymore (3cm for snow and 10cm for ice). So, it writes as exp(-kappa*max(0,z-ssl)), with ssl=surface scattering layer.
- debug sbccpl.F90 for IPSL and Met-Office
- limitation of ice/snow temperatures and salinity to avoid overshooting and then to overcome a recurrent issue with the 2 advection schemes (UMx and Prather)
- namelist param changes for best simulations. OPA: nn_mxl=3 (instead of 2), nn_mxlice=2 (instead of 0). SI3: nn_snwfra=2, nn_qtrice=1, ln_pnd=true
- rewrite heat budget of the ice, so it includes the solar flux transmitted thru the ice and is conservative by construction. Also, activating ln_icediachk now gives an ascii file (icedrift_diagnostics.ascii) containing mass, salt and heat global conservation issues (if any). In addition, 2D drift files can be outputed.
- debug outputs for shear and normal stresses in rheology
Others:
- reduce number of mpi communications in rheology and in the two advection schemes
OCE:
New physics controlled by a namelist parameter:
- ice-ocean drags can now be calculated implicitly => ln_drgice_imp. For instance, it may allow ORCA2 to run with a time step of 5760s instead of 5400s...
- turbulent mixing is modified due to the presence of sea ice (zdfgls and zdftke routines).
- With tke, one can choose to 1) take into account sea-ice for the depth of the mixed layer (=> nn_mxlice) and 2) attenuate surface wave breaking and langmuir cells under sea ice (=> nn_eice).
- With gls, sea ice intervenes as 1) a friction surface with a specific roughness parameter (nn_hsri) and 2) a damping for surface wave breaking (nn_z0_ice).
Hard coded developments and debugs:
- update coupling interface for sea-ice
- fix coastal boundary conditions in dyn_ldf_blp, see #2449
- debug in zdfgls when there is no top/bottom friction (ticket #2435)
- debug in zdftke for the ice shelves (ticket #2406, critical)
- rewrite fmask so that on-point straits slip condition is determined by the namelist parameter rn_shlat as for all the other points, and is not solely free slip (ticket #2237)
- debug hybrid s-z coordinates (ln_hpg_prj=true, ticket #2474, major)
- fix minor bug in dynvor, see #2446
- debug waves (tickets #2445 and #2447, both critical)
- debug icebergs (ticket #2407, critical)
- debug freshwater budget (ticket #2376)
- out-of-bounds in bdydta, see #2410
- better detection and managment of errors messages
The detail list all fixes can bee seen :
Because of the reorganization of the 4.0* svn branches between the 4.0.2 and the 4.0.4, the complete list of code modification is split in 2 parts
- https://forge.ipsl.jussieu.fr/nemo/changeset?sfp_email=&sfph_mail=&reponame=&new=12564%40NEMO%2Freleases%2Frelease-4.0-HEAD&old=12375%40NEMO%2Freleases%2Frelease-4.0-HEAD&sfp_email=&sfph_mail=
- https://forge.ipsl.jussieu.fr/nemo/changeset?sfp_email=&sfph_mail=&reponame=&new=13648%40NEMO%2Freleases%2Fr4.0%2Fr4.0-HEAD&old=12578%40NEMO%2Freleases%2Fr4.0%2Fr4.0-HEAD&sfp_email=&sfph_mail=
From now on, to download the NEMO reference, we recommend to use this new intermediate release, especially for the projects using coupled ocean-atmosphere configurations: svn co https://forge.ipsl.jussieu.fr/nemo/svn/NEMO/releases/r4.0/r4.0.4
Practical issue when upgrading to this release (namelists and xml) :
- Critical changes in namelist_ref:
- deleted variable: ln_drg
- renamed variables: ln_OFF -> ln_drg_OFF, rn_eice -> nn_eice
- Critical changes in namelist_ice_ref:
- renamed variables: rn_depfra -> rn_lf_depfra, rn_icebfr -> rn_lf_bfr, rn_lfrelax -> rn_lf_relax, rn_tensile -> rn_lf_tensile
- Critical changes in namelist_pisces_ref:
- renamed variables: mprat2 -> mpratd, xpref2p -> xpref2n
- Critical changes in field_def_nemo-oce.xml:
- added variables: socegrad, socegrad2, eken_int, relvor, absvor, potvor, salt2c
- Critical changes in field_def_nemo-ice.xml:
- added variables: icehlid, icevlid, beta_evp, uice_cvg, dmilam, icehlid_cat, iceaepnd_cat, tice_cvgerr, tice_cvgstp
- all changes in cfgs/SHARED/namelist_* and cfgs/SHARED/*xml files:
-
namelist_ice_ref
45 rn_himin = 0.1 ! minimum ice thickness (m) used in remapping 45 rn_himin = 0.1 ! minimum ice thickness (m) allowed 46 rn_himax = 99.0 ! maximum ice thickness (m) allowed … … 58 rn_ depfra= 0.125 ! fraction of ocean depth that ice must reach to initiate landfast59 rn_lf_depfra = 0.125 ! fraction of ocean depth that ice must reach to initiate landfast … … 60 rn_ icebfr = 15. ! maximum bottom stress per unit volume [N/m3]61 rn_lf relax= 1.e-5 ! relaxation time scale to reach static friction [s-1]62 rn_ tensile= 0.05 ! isotropic tensile strength [0-0.5??]61 rn_lf_bfr = 15. ! maximum bottom stress per unit volume [N/m3] 62 rn_lf_relax = 1.e-5 ! relaxation time scale to reach static friction [s-1] 63 rn_lf_tensile = 0.05 ! isotropic tensile strength [0-0.5??] … … 96 nn_nevp = 1 20 ! number of EVP subcycles97 nn_nevp = 100 ! number of EVP subcycles … … 98 ! advised value: 1/3 (rn_nevp=120) or 1/9 (rn_nevp=300) 99 ! advised value: 1/3 (nn_nevp=100) or 1/9 (nn_nevp=300) 100 nn_rhg_chkcvg = 0 ! check convergence of rheology 101 ! = 0 no check 102 ! = 1 check at the main time step (output xml: uice_cvg) 103 ! = 2 check at both main and rheology time steps (additional output: ice_cvg.nc) 104 ! this option 2 asks a lot of communications between cpu … … 111 rn_blow_s = 0.66 ! mesure of snow blowing into the leads 117 nn_snwfra = 2 ! calculate the fraction of ice covered by snow (for zdf and albedo) 118 ! = 0 fraction = 1 (if snow) or 0 (if no snow) 119 ! = 1 fraction = 1-exp(-0.2*rhos*hsnw) [MetO formulation] 120 ! = 2 fraction = hsnw / (hsnw+0.02) [CICE formulation] 121 rn_snwblow = 0.66 ! mesure of snow blowing into the leads … … 130 nn_qtrice = 1 ! Solar flux transmitted thru the surface scattering layer: 131 ! = 0 Grenfell and Maykut 1977 (depends on cloudiness and is 0 when there is snow) 132 ! = 1 Lebrun 2019 (equals 0.3 anytime with different melting/dry snw conductivities) … … 141 ! 142 ln_leadhfx = .true. ! heat in the leads is used to melt sea-ice before warming the ocean … … 153 rn_kappa_s = 10.0 ! nn_qtrice = 0: radiation attenuation coefficient in snow [1/m] 154 rn_kappa_smlt = 7.0 ! nn_qtrice = 1: radiation attenuation coefficient in melting snow [1/m] 155 rn_kappa_sdry = 10.0 ! radiation attenuation coefficient in dry snow [1/m] 156 ln_zdf_chkcvg = .false. ! check convergence of heat diffusion scheme (outputs: tice_cvgerr, tice_cvgstp) … … 177 ln_pnd = .false. ! activate melt ponds or not 178 ln_pnd_H12 = .false. ! activate evolutive melt ponds (from Holland et al 2012) 179 ln_pnd_CST = .false. ! activate constant melt ponds 196 ln_pnd = .true. ! activate melt ponds or not 197 ln_pnd_LEV = .true. ! level ice melt ponds (from Flocco et al 2007,2010 & Holland et al 2012) 198 rn_apnd_min = 0.15 ! minimum ice fraction that contributes to melt pond. range: 0.0 -- 0.15 ?? 199 rn_apnd_max = 0.85 ! maximum ice fraction that contributes to melt pond. range: 0.7 -- 0.85 ?? 200 ln_pnd_CST = .false. ! constant melt ponds … … 182 ln_pnd_alb = .false. ! melt ponds affect albedo or not 203 ln_pnd_lids = .true. ! frozen lids on top of the ponds (only for ln_pnd_LEV) 204 ln_pnd_alb = .true. ! effect of melt ponds on ice albedo … … 188 ln_iceini_file = .false. ! netcdf file provided for initialization (T) or not (F) 210 nn_iceini_file = 0 ! 0 = Initialise sea ice based on SSTs 211 ! 1 = Initialise sea ice from single category netcdf file 212 ! 2 = Initialise sea ice from multi category restart file … … 208 ! -- for ln_iceini_file = T 232 rn_hld_ini_n = 0.0 ! initial pond lid depth (m), North 233 rn_hld_ini_s = 0.0 ! " " South 234 ! -- for nn_iceini_file = 1 … … 245 sn_hld = 'NOT USED' , -12 ,'hld' , .false. , .true., 'yearly' , '' , '', '' -
namelist_ref
283 sn_tdif = 'taudif_core' , 24 , 'taudif' , .false. , .true. , 'yearly' , 'weights_core_orca2_bilinear_noc.nc' , '' , '' 283 sn_cc = 'NOT USED' , 24. , 'CC' , .false. , .true. , 'yearly' , 'weights_core_orca2_bilinear_noc.nc' , '' , '' 284 sn_tdif = 'taudif_core' , 24. , 'taudif' , .false. , .true. , 'yearly' , 'weights_core_orca2_bilinear_noc.nc' , '' , '' … … 292 ln_scale_ice_flux = .false. ! use ice fluxes that are already "ice weighted" ( i.e. multiplied ice concentration) … … 421 ln_rnf_icb = .false. ! read in iceberg flux from a file (fill sn_i_rnf if .true.) … … 432 sn_i_rnf = 'NOT_USED' , -1. , 'sorunoff', .true. , .true. , 'yearly' , '' , '' , '' … … 649 bn_hil = 'NOT USED' , 24. , 'sihlid' , .true. , .false., 'daily' , '' , '' , '' … … 656 rn_ice_hlid = 0.0 ! -- pond lid depth -- … … 664 !! namdrg_top top friction (ln_ OFF=F & ln_isfcav=T)665 !! namdrg_bot bottom friction (ln_ OFF=F)670 !! namdrg_top top friction (ln_drg_OFF=F & ln_isfcav=T) 671 !! namdrg_bot bottom friction (ln_drg_OFF=F) … … 673 ln_ OFF= .false. ! free-slip : Cd = 0 (F => fill namdrg_bot679 ln_drg_OFF = .false. ! free-slip : Cd = 0 (F => fill namdrg_bot … … 685 ln_drgice_imp = .false. ! implicit ice-ocean drag … … 681 &namdrg_top ! TOP friction (ln_ OFF =F & ln_isfcav=T)688 &namdrg_top ! TOP friction (ln_drg_OFF =F & ln_isfcav=T) … … 692 &namdrg_bot ! BOTTOM friction (ln_ OFF =F)699 &namdrg_bot ! BOTTOM friction (ln_drg_OFF =F) … … 1049 nn_mxl = 2! mixing length: = 0 bounded by the distance to surface and bottom1056 nn_mxl = 3 ! mixing length: = 0 bounded by the distance to surface and bottom … … 1061 nn_mxlice = 2 ! type of scaling under sea-ice 1062 ! = 0 no scaling under sea-ice 1063 ! = 1 scaling with constant sea-ice thickness 1064 ! = 2 scaling with mean sea-ice thickness ( only with SI3 sea-ice model ) 1065 ! = 3 scaling with maximum sea-ice thickness 1066 rn_mxlice = 10. ! max constant ice thickness value when scaling under sea-ice ( nn_mxlice=1) … … 1055 ln_drg = .false. ! top/bottom friction added as boundary condition of TKE… … 1066 rn_eice = 4 ! below sea ice: =0 ON ; =4 OFF when ice fraction > 1/4 1078 nn_eice = 1 ! attenutaion of langmuir & surface wave breaking under ice 1079 ! ! = 0 no impact of ice cover on langmuir & surface wave breaking 1080 ! ! = 1 weigthed by 1-TANH(10*fr_i) 1081 ! ! = 2 weighted by 1-fr_i 1082 ! ! = 3 weighted by 1-MIN(1,4*fr_i) … … 1095 rn_hsri = 0.03 ! Ice-ocean roughness … … 1099 nn_z0_ice = 1 ! attenutaion of surface wave breaking under ice 1100 ! ! = 0 no impact of ice cover 1101 ! ! = 1 roughness uses rn_hsri and is weigthed by 1-TANH(10*fr_i) 1102 ! ! = 2 roughness uses rn_hsri and is weighted by 1-fr_i 1103 ! ! = 3 roughness uses rn_hsri and is weighted by 1-MIN(1,4*fr_i) -
namelist_top_ref
124 ln_trdmld_trc_restart = .false. ! restart for ML diagnostics 125 ln_trdmld_trc_instant = .true. ! flag to diagnose trends of instantantaneous or mean ML T/S 124 ln_trdmxl_trc_restart = .false. ! restart for ML diagnostics 125 ln_trdmxl_trc_instant = .true. ! flag to diagnose trends of instantantaneous or mean ML T/S 126 cn_trdrst_trc_in = 'restart_trd' ! suffix of pass. tracer trends restart name (input) 127 cn_trdrst_trc_out = 'restart_trd' ! suffix of pass. tracer trends restart name (output) -
field_def_nemo-ice.xml
51 <field id="icehlid" long_name="melt pond lid depth" standard_name="sea_ice_meltpondlid_depth" unit="m" /> 52 <field id="icevlid" long_name="melt pond lid volume" standard_name="sea_ice_meltpondlid_volume" unit="m" /> … … 85 <field id="beta_evp" long_name="Relaxation parameter of ice rheology (beta)" standard_name="relaxation_parameter_of_ice_rheology" unit="" /> … … 176 <!-- rheology convergence tests --> 177 <field id="uice_cvg" long_name="sea ice velocity convergence" standard_name="sea_ice_velocity_convergence" unit="m/s" /> 178 … … 217 <field id="dmilam" long_name="sea-ice mass change through lateral melting" standard_name="tendency_of_sea_ice_amount_due_to_lateral_melting" unit="kg/m2/s" /> … … 296 <field id="icehlid_cat" long_name="Ice melt pond lid thickness per category" unit="m" detect_missing_value="true" /> … … 298 <field id="iceaepnd_cat" long_name="Ice melt pond effective fraction per category" unit="" /> … … 310 <!-- heat diffusion convergence tests --> 311 <field id="tice_cvgerr" long_name="sea ice temperature convergence error" standard_name="sea_ice_temperature_convergence_err" unit="K" /> 312 <field id="tice_cvgstp" long_name="sea ice temperature convergence iterations" standard_name="sea_ice_temperature_convergence_stp" unit="" /> 313 … … 573 <field field_ref="dmilam" name="sidmassmeltlat" /> -
namelist_pisces_ref
199 mprat 2= 0.01 ! Diatoms mortality rate199 mpratd = 0.01 ! Diatoms mortality rate … … 232 xpref2d = 1. ! zoo preference for phyto233 xpref2 p = 1. ! zoo preference for POC232 xpref2d = 1. ! zoo preference for Diatoms 233 xpref2n = 1. ! zoo preference for nanophyto … … 235 xpref2m = 0.2 ! meso preference forzoo236 xpref2c = 0.3 ! zoo preference for poc235 xpref2m = 0.2 ! zoo preference for mesozoo 236 xpref2c = 0.3 ! zoo preference for POC -
field_def_nemo-oce.xml
38 <!--- additions to diawri.F90 ---> 39 <field id="socegrad" long_name="module of salinity gradient" unit="psu/m" grid_ref="grid_T_3D"/> 40 <field id="socegrad2" long_name="square of module of salinity gradient" unit="psu2/m2" grid_ref="grid_T_3D"/> 41 <field id="eken_int" long_name="vertical integration of kinetic energy" unit="m3/s2" /> 42 <field id="relvor" long_name="relative vorticity" unit="s-1" grid_ref="grid_T_3D"/> 43 <field id="absvor" long_name="absolute vorticity" unit="s-1" grid_ref="grid_T_3D"/> 44 <field id="potvor" long_name="potential vorticity" unit="s-1" grid_ref="grid_T_3D"/> 45 <field id="salt2c" long_name="Salt content vertically integrated" unit="1e-3*kg/m2" /> … … 85 <field id="bn2" long_name="squared Brunt-Vaisala frequency" unit="s-1" grid_ref="grid_T_3D" />… … 544 <!-- EOS --> 545 <field id="bn2" long_name="squared Brunt-Vaisala frequency" unit="s-2" /> 546 … … 592 <!-- variables available with key_float-->602 <!-- variables available with ln_floats -->
Last modified 4 years ago
Last modified on 2020-10-22T09:39:06+02:00
