Changeset 5792 for branches

Timestamp:

2015-10-13T16:20:38+02:00 (9 years ago)

Author:

mathiot

Message:

ice shelf cavity: modification of the documentation

Location:

branches/2015/dev_r5151_UKMO_ISF/DOC/TexFiles

Files:

• Biblio/Biblio.bib (modified) (4 diffs)
• Chapters/Chap_SBC.tex (modified) (4 diffs)
• Namelist/namsbc (modified) (1 diff)
• Namelist/namsbc_isf (modified) (1 diff)

branches/2015/dev_r5151_UKMO_ISF/DOC/TexFiles/Biblio/Biblio.bib

@@ -276 +276 @@
   author = {A. Beckmann and H. Goosse},
   title = {A parameterization of ice shelf-ocean interaction for climate models},
-  journal = OM
-  year = {2003}
-  volume = {5}
+  journal = OM,
+  year = {2003},
+  volume = {5},
   pages = {157--170}
 }
@@ -1347 +1347 @@
 }
 
+@ARTICLE{Holland1999, 
+  author = {D. Holland and A. Jenkins},
+  title = {Modeling Thermodynamic Ice-Ocean Interactions at the Base of an Ice Shelf},
+  journal = JPO,
+  year = {1999},
+  volume = {29},  
+  pages = {1787--1800},
+}
+
 @ARTICLE{HollowayOM86,
   author = {Greg Holloway},
@@ -1493 +1502 @@
 }
 
+@ARTICLE{Jenkins1991,
+  author = {A. Jenkins},
+  title = {A one-dimensional model of ice shelf-ocean interaction},
+  journal = JGR,
+  year = {1991},
+  volume = {96},  number = {C11},
+  pages = {2298--2312}
+}
+
+@ARTICLE{Jenkins2010,
+  author = {A. Jenkins},
+  title = {observation and parameterization of ablation at the base of Ronne Ice Shelf, Antarctica},
+  journal = JPO,
+  year = {2010},
+  volume = {40},  number = {10},
+  pages = {2298--2312}
+}
+
 @BOOK{Jerlov_Bk68,
   title = {Optical Oceanography},
@@ -1898 +1925 @@
   volume = {51},
   pages = {737--769}
+}
+
+@ARTICLE{Losch2008,
+  author = {M. Losch},
+  title = {Modeling ice shelf cavities in a z coordinate ocean general circulation model},
+  journal = JGR,
+  year = {2008},
+  volume = {113},  number = {C13},
 }
 

branches/2015/dev_r5151_UKMO_ISF/DOC/TexFiles/Chapters/Chap_SBC.tex

@@ -49 +49 @@
 (\np{nn\_ice}~=~0,1, 2 or 3); the addition of river runoffs as surface freshwater 
 fluxes or lateral inflow (\np{ln\_rnf}~=~true); the addition of isf melting as lateral inflow (parameterisation) 
-(\np{nn\_isf}~=~2 or 3 and \np{ln\_isfcav}~=~false) or as surface flux at the land-ice ocean interface
-(\np{nn\_isf}~=~1 or 4 and \np{ln\_isfcav}~=~true); 
+ or as surface flux at the land-ice ocean interface (\np{ln\_isf}=~true); 
 the addition of a freshwater flux adjustment in order to avoid a mean sea-level drift (\np{nn\_fwb}~=~0,~1~or~2); the 
 transformation of the solar radiation (if provided as daily mean) into a diurnal 
@@ -958 +957 @@
 \namdisplay{namsbc_isf}
 %--------------------------------------------------------------------------------------------------------
-Namelist variable in \ngn{namsbc}, \np{nn\_isf},  control the kind of ice shelf representation used. 
+Namelist variable in \ngn{namsbc}, \np{nn\_isf}, control the kind of ice shelf representation used. 
 \begin{description}
 \item[\np{nn\_isf}~=~1]
-The ice shelf cavity is represented. The fwf and heat flux are computed. 
+The ice shelf cavity is represented. The fwf and heat flux are computed. 2 bulk formulations are available: the ISOMIP one (\np{nn\_isfblk = 1}) described in (\np{nn\_isfblk = 2}), the 3 equation formulation described in \citet{Jenkins1991}. In addition to this, 
+3 different way to compute the exchange coefficient are available. $\gamma\_{T/S}$ is constant (\np{nn\_gammablk = 0}), $\gamma\_{T/S}$ is velocity dependant \citep{Jenkins2010} (\np{nn\_gammablk = 1}) and $\gamma\_{T/S}$ is velocity dependant and stratification dependent \citep{Holland1999} (\np{nn\_gammablk = 2}). For each of them, the thermal/salt exchange coefficient (\np{rn\_gammat0} and \np{rn\_gammas0}) have to be specified (the default values are for the ISOMIP case). 
 Full description, sensitivity and validation in preparation. 
 
@@ -969 +969 @@
 (\np{sn\_depmax\_isf}) and the base of the ice shelf along the calving front (\np{sn\_depmin\_isf}) as in (\np{nn\_isf}~=~3). 
 Furthermore the fwf is computed using the \citet{Beckmann2003} parameterisation of isf melting. 
-The effective melting length (\np{sn\_Leff\_isf}) is read from a file.
+The effective melting length (\np{sn\_Leff\_isf}) is read from a file and the exchange coefficients are set as (\np{rn\_gammat0}) and (\np{rn\_gammas0}).
 
 \item[\np{nn\_isf}~=~3]
@@ -987 +987 @@
 \np{nn\_isf}~=~3 and \np{nn\_isf}~=~4 read the melt rate and heat flux from a file. You have total control of the fwf scenario.
 
- This can be usefull if the water masses on the shelf are not realistic or the resolution (horizontal/vertical) are too 
+This can be usefull if the water masses on the shelf are not realistic or the resolution (horizontal/vertical) are too 
 coarse to have realistic melting or for sensitivity studies where you want to control your input. 
 Full description, sensitivity and validation in preparation. 
 
-There is 2 ways to apply the fwf to NEMO. The first possibility (\np{ln\_divisf}~=~false) applied the fwf
- and heat flux directly on the salinity and temperature tendancy. The second possibility (\np{ln\_divisf}~=~true)
- apply the fwf as for the runoff fwf (see \S\ref{SBC_rnf}). The mass/volume addition due to the ice shelf melting is,
- at each relevant depth level, added to the horizontal divergence (\textit{hdivn}) in the subroutine \rou{sbc\_isf\_div} 
-(called from \mdl{divcur}). 
+\np{rn\_hisf\_tbl} is the top boundary layer (tbl) thickness used by the Losch parametrisation \citep{Losch2008} to compute the melt. if 0, temperature/salt/velocity in the top cell is used to compute the melt.
+Otherwise, NEMO used the mean value into the tbl. 
 %
 % ================================================================

branches/2015/dev_r5151_UKMO_ISF/DOC/TexFiles/Namelist/namsbc

@@ -19 +19 @@
    ln_dm2dc    = .false.   !  daily mean to diurnal cycle on short wave
    ln_rnf      = .true.    !  runoffs                                   (T => fill namsbc_rnf)
-   nn_isf      = 0         !  ice shelf melting/freezing                (/=0 => fill namsbc_isf)
-                           !  0 =no isf                  1 = presence of ISF
-                           !  2 = bg03 parametrisation   3 = rnf file for isf
-                           !  4 = ISF fwf specified
-                           !  option 1 and 4 need ln_isfcav = .true. (domzgr)
+   ln_isf      = .false.   !  ice shelf melting/freezing                (T => fill namsbc_isf)
    ln_ssr      = .true.    !  Sea Surface Restoring on T and/or S       (T => fill namsbc_ssr)
    nn_fwb      = 3         !  FreshWater Budget: =0 unchecked

branches/2015/dev_r5151_UKMO_ISF/DOC/TexFiles/Namelist/namsbc_isf

@@ -2 +2 @@
 &namsbc_isf    !  Top boundary layer (ISF)
 !-----------------------------------------------------------------------
+   nn_isf      = -99       !  ice shelf melting/freezing                (/=0 => fill namsbc_isf)
+                           !  1 = ISF explicit (cavity open)
+                           !  2 = bg03 parametrisation (cavity closed)  
+                           !  3 = ISF  specified in depth along the calving front (cavity closed)
+                           !  4 = ISF melting specified (cavity open)
+                           !  option 1 and 4 need ln_isfcav = .true. (domzgr)
 !              ! file name ! frequency (hours) ! variable ! time interpol. !  clim   ! 'yearly'/ ! weights  ! rotation !
 !              !           !  (if <0  months)  !   name   !    (logical)   !  (T/F)  ! 'monthly' ! filename ! pairing  !
 ! nn_isf == 4
-   sn_qisf      = 'rnfisf' ,         -12      ,'sohflisf',    .false.      , .true.  , 'yearly'  ,  ''      ,   ''
    sn_fwfisf    = 'rnfisf' ,         -12      ,'sowflisf',    .false.      , .true.  , 'yearly'  ,  ''      ,   ''
 ! nn_isf == 3
    sn_rnfisf    = 'runoffs' ,         -12      ,'sofwfisf',    .false.      , .true.  , 'yearly'  ,  ''      ,   ''
-! nn_isf == 2 and 3
+! nn_isf == 2 or 3
    sn_depmax_isf = 'runoffs' ,       -12        ,'sozisfmax' ,   .false.  , .true.  , 'yearly'  ,  ''      ,   ''
    sn_depmin_isf = 'runoffs' ,       -12        ,'sozisfmin' ,   .false.  , .true.  , 'yearly'  ,  ''      ,   ''
 ! nn_isf == 2
    sn_Leff_isf = 'rnfisf' ,       0          ,'Leff'         ,   .false.  , .true.  , 'yearly'  ,  ''      ,   ''
-! for all case
-   ln_divisf   = .true.  ! apply isf melting as a mass flux or in the salinity trend. (maybe I should remove this option as for runoff?)
 ! only for nn_isf = 1 or 2
    rn_gammat0  = 1.0e-4   ! gammat coefficient used in blk formula
    rn_gammas0  = 1.0e-4   ! gammas coefficient used in blk formula
+! only for nn_isf = 1 or 4
+   nn_isfblk   =  1       ! 1 ISOMIP ; 2 conservative (3 equation formulation, Jenkins et al. 1991 ??)
 ! only for nn_isf = 1
-   nn_isfblk   =  1       ! 1 ISOMIP ; 2 conservative (3 equation formulation, Jenkins et al. 1991 ??)
-   rn_hisf_tbl =  30.      ! thickness of the top boundary layer           (Losh et al. 2008)
+   rn_hisf_tbl =  30.     ! thickness of the top boundary layer           (Losh et al. 2008)
                           ! 0 => thickness of the tbl = thickness of the first wet cell
-   ln_conserve = .true.   ! conservative case (take into account meltwater advection)
    nn_gammablk = 1        ! 0 = cst Gammat (= gammat/s)
                           ! 1 = velocity dependend Gamma (u* * gammat/s)  (Jenkins et al. 2010)