- Timestamp:
- 2015-10-13T16:20:38+02:00 (9 years ago)
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
branches/2015/dev_r5151_UKMO_ISF/DOC/TexFiles/Chapters/Chap_SBC.tex
r5120 r5792 49 49 (\np{nn\_ice}~=~0,1, 2 or 3); the addition of river runoffs as surface freshwater 50 50 fluxes or lateral inflow (\np{ln\_rnf}~=~true); the addition of isf melting as lateral inflow (parameterisation) 51 (\np{nn\_isf}~=~2 or 3 and \np{ln\_isfcav}~=~false) or as surface flux at the land-ice ocean interface 52 (\np{nn\_isf}~=~1 or 4 and \np{ln\_isfcav}~=~true); 51 or as surface flux at the land-ice ocean interface (\np{ln\_isf}=~true); 53 52 the addition of a freshwater flux adjustment in order to avoid a mean sea-level drift (\np{nn\_fwb}~=~0,~1~or~2); the 54 53 transformation of the solar radiation (if provided as daily mean) into a diurnal … … 958 957 \namdisplay{namsbc_isf} 959 958 %-------------------------------------------------------------------------------------------------------- 960 Namelist variable in \ngn{namsbc}, \np{nn\_isf}, 959 Namelist variable in \ngn{namsbc}, \np{nn\_isf}, control the kind of ice shelf representation used. 961 960 \begin{description} 962 961 \item[\np{nn\_isf}~=~1] 963 The ice shelf cavity is represented. The fwf and heat flux are computed. 962 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, 963 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). 964 964 Full description, sensitivity and validation in preparation. 965 965 … … 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). 970 970 Furthermore the fwf is computed using the \citet{Beckmann2003} parameterisation of isf melting. 971 The effective melting length (\np{sn\_Leff\_isf}) is read from a file .971 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}). 972 972 973 973 \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. 988 988 989 989 This can be usefull if the water masses on the shelf are not realistic or the resolution (horizontal/vertical) are too 990 990 coarse to have realistic melting or for sensitivity studies where you want to control your input. 991 991 Full description, sensitivity and validation in preparation. 992 992 993 There is 2 ways to apply the fwf to NEMO. The first possibility (\np{ln\_divisf}~=~false) applied the fwf 994 and heat flux directly on the salinity and temperature tendancy. The second possibility (\np{ln\_divisf}~=~true) 995 apply the fwf as for the runoff fwf (see \S\ref{SBC_rnf}). The mass/volume addition due to the ice shelf melting is, 996 at each relevant depth level, added to the horizontal divergence (\textit{hdivn}) in the subroutine \rou{sbc\_isf\_div} 997 (called from \mdl{divcur}). 993 \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. 994 Otherwise, NEMO used the mean value into the tbl. 998 995 % 999 996 % ================================================================
Note: See TracChangeset
for help on using the changeset viewer.
