Ignore:
Timestamp:
2015-07-15T17:46:12+02:00 (5 years ago)
Author:
andrewryan
Message:

merged in latest version of trunk alongside changes to SAO_SRC to be compatible with latest OBS

File:
1 edited

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  • branches/2014/dev_r4650_UKMO14.12_STAND_ALONE_OBSOPER/DOC/TexFiles/Chapters/Chap_SBC.tex

    r5034 r5600  
    11% ================================================================ 
    2 % Chapter � Surface Boundary Condition (SBC, ICB)  
    3 % ================================================================ 
    4 \chapter{Surface Boundary Condition (SBC, ICB) } 
     2% Chapter � Surface Boundary Condition (SBC, ISF, ICB)  
     3% ================================================================ 
     4\chapter{Surface Boundary Condition (SBC, ISF, ICB) } 
    55\label{SBC} 
    66\minitoc 
     
    4848below ice-covered areas (using observed ice-cover or a sea-ice model)  
    4949(\np{nn\_ice}~=~0,1, 2 or 3); the addition of river runoffs as surface freshwater  
    50 fluxes or lateral inflow (\np{ln\_rnf}~=~true); the addition of a freshwater flux adjustment  
    51 in order to avoid a mean sea-level drift (\np{nn\_fwb}~=~0,~1~or~2); the  
     50fluxes 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);  
     53the addition of a freshwater flux adjustment in order to avoid a mean sea-level drift (\np{nn\_fwb}~=~0,~1~or~2); the  
    5254transformation of the solar radiation (if provided as daily mean) into a diurnal  
    5355cycle (\np{ln\_dm2dc}~=~true); and a neutral drag coefficient can be read from an external wave  
     
    6062Finally, the different options that further modify the fluxes applied to the ocean are discussed. 
    6163One of these is modification by icebergs (see \S\ref{ICB_icebergs}), which act as drifting sources of fresh water. 
     64Another example of modification is that due to the ice shelf melting/freezing (see \S\ref{SBC_isf}),  
     65which provides additional sources of fresh water. 
    6266 
    6367 
     
    686690air temperature, sea-surface temperature, cloud cover and relative humidity. 
    687691Sensible heat and latent heat fluxes are computed by classical 
    688 bulk formulae parameterized according to \citet{Kondo1975}. 
     692bulk formulae parameterised according to \citet{Kondo1975}. 
    689693Details on the bulk formulae used can be found in \citet{Maggiore_al_PCE98} and \citet{Castellari_al_JMS1998}. 
    690694 
     
    826830\Pi-g\delta = (1+k-h) \Pi_{A}(\lambda,\phi) 
    827831\end{equation} 
    828 with $k$ a number of Love estimated to 0.6 which parametrized the astronomical tidal land, 
    829 and $h$ a number of Love to 0.3 which parametrized the parametrization due to the astronomical tidal land. 
     832with $k$ a number of Love estimated to 0.6 which parameterised the astronomical tidal land, 
     833and $h$ a number of Love to 0.3 which parameterised the parameterisation due to the astronomical tidal land. 
    830834 
    831835% ================================================================ 
     
    945949 
    946950%} 
    947  
    948  
     951% ================================================================ 
     952%        Ice shelf melting 
     953% ================================================================ 
     954\section   [Ice shelf melting (\textit{sbcisf})] 
     955                        {Ice shelf melting (\mdl{sbcisf})} 
     956\label{SBC_isf} 
     957%------------------------------------------namsbc_isf---------------------------------------------------- 
     958\namdisplay{namsbc_isf} 
     959%-------------------------------------------------------------------------------------------------------- 
     960Namelist variable in \ngn{namsbc}, \np{nn\_isf},  control the kind of ice shelf representation used.  
     961\begin{description} 
     962\item[\np{nn\_isf}~=~1] 
     963The ice shelf cavity is represented. The fwf and heat flux are computed.  
     964Full description, sensitivity and validation in preparation.  
     965 
     966\item[\np{nn\_isf}~=~2] 
     967A parameterisation of isf is used. The ice shelf cavity is not represented.  
     968The fwf is distributed along the ice shelf edge between the depth of the average grounding line (GL) 
     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).  
     970Furthermore the fwf is computed using the \citet{Beckmann2003} parameterisation of isf melting.  
     971The effective melting length (\np{sn\_Leff\_isf}) is read from a file. 
     972 
     973\item[\np{nn\_isf}~=~3] 
     974A simple parameterisation of isf is used. The ice shelf cavity is not represented.  
     975The fwf (\np{sn\_rnfisf}) is distributed along the ice shelf edge between the depth of the average grounding line (GL) 
     976(\np{sn\_depmax\_isf}) and the base of the ice shelf along the calving front (\np{sn\_depmin\_isf}). 
     977Full description, sensitivity and validation in preparation. 
     978 
     979\item[\np{nn\_isf}~=~4] 
     980The ice shelf cavity is represented. However, the fwf (\np{sn\_fwfisf}) and heat flux (\np{sn\_qisf}) are  
     981not computed but specified from file.  
     982\end{description} 
     983 
     984\np{nn\_isf}~=~1 and \np{nn\_isf}~=~2 compute a melt rate based on the water masse properties, ocean velocities and depth. 
     985 This flux is thus highly dependent of the model resolution (horizontal and vertical), realism of the water masse onto the shelf ... 
     986 
     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 
     989 This can be usefull if the water masses on the shelf are not realistic or the resolution (horizontal/vertical) are too  
     990coarse to have realistic melting or for sensitivity studies where you want to control your input.  
     991Full description, sensitivity and validation in preparation.  
     992 
     993There 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}).  
     998% 
    949999% ================================================================ 
    9501000%        Handling of icebergs 
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