Changeset 5837 for branches/2014/dev_r4650_UKMO14.4_OBS_GENERAL_VINTERP/DOC/TexFiles/Chapters/Chap_SBC.tex
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branches/2014/dev_r4650_UKMO14.4_OBS_GENERAL_VINTERP/DOC/TexFiles/Chapters/Chap_SBC.tex
r4230 r5837 1 1 % ================================================================ 2 % Chapter � Surface Boundary Condition (SBC, I CB)3 % ================================================================ 4 \chapter{Surface Boundary Condition (SBC, I CB) }2 % Chapter � Surface Boundary Condition (SBC, ISF, ICB) 3 % ================================================================ 4 \chapter{Surface Boundary Condition (SBC, ISF, ICB) } 5 5 \label{SBC} 6 6 \minitoc … … 48 48 below ice-covered areas (using observed ice-cover or a sea-ice model) 49 49 (\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 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); 53 the addition of a freshwater flux adjustment in order to avoid a mean sea-level drift (\np{nn\_fwb}~=~0,~1~or~2); the 52 54 transformation of the solar radiation (if provided as daily mean) into a diurnal 53 55 cycle (\np{ln\_dm2dc}~=~true); and a neutral drag coefficient can be read from an external wave … … 60 62 Finally, the different options that further modify the fluxes applied to the ocean are discussed. 61 63 One of these is modification by icebergs (see \S\ref{ICB_icebergs}), which act as drifting sources of fresh water. 64 Another example of modification is that due to the ice shelf melting/freezing (see \S\ref{SBC_isf}), 65 which provides additional sources of fresh water. 62 66 63 67 … … 348 352 horizontal and vertical dimensions of the associated variable and should 349 353 be equal to 1 over land and 0 elsewhere. 350 The procedure can be recursively applied setting nn _lsm > 1 in namsbc namelist.351 Note that nn _lsm=0 forces the code to not apply the procedure even if a file for land/sea mask is supplied.354 The procedure can be recursively applied setting nn\_lsm > 1 in namsbc namelist. 355 Note that nn\_lsm=0 forces the code to not apply the procedure even if a file for land/sea mask is supplied. 352 356 353 357 \subsubsection{Bilinear Interpolation} … … 686 690 air temperature, sea-surface temperature, cloud cover and relative humidity. 687 691 Sensible heat and latent heat fluxes are computed by classical 688 bulk formulae parameteri zed according to \citet{Kondo1975}.692 bulk formulae parameterised according to \citet{Kondo1975}. 689 693 Details on the bulk formulae used can be found in \citet{Maggiore_al_PCE98} and \citet{Castellari_al_JMS1998}. 690 694 … … 826 830 \Pi-g\delta = (1+k-h) \Pi_{A}(\lambda,\phi) 827 831 \end{equation} 828 with $k$ a number of Love estimated to 0.6 which paramet rized the astronomical tidal land,829 and $h$ a number of Love to 0.3 which paramet rized the parametrization due to the astronomical tidal land.832 with $k$ a number of Love estimated to 0.6 which parameterised the astronomical tidal land, 833 and $h$ a number of Love to 0.3 which parameterised the parameterisation due to the astronomical tidal land. 830 834 831 835 % ================================================================ … … 945 949 946 950 %} 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 %-------------------------------------------------------------------------------------------------------- 960 Namelist variable in \ngn{namsbc}, \np{nn\_isf}, control the kind of ice shelf representation used. 961 \begin{description} 962 \item[\np{nn\_isf}~=~1] 963 The ice shelf cavity is represented. The fwf and heat flux are computed. 964 Full description, sensitivity and validation in preparation. 965 966 \item[\np{nn\_isf}~=~2] 967 A parameterisation of isf is used. The ice shelf cavity is not represented. 968 The 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). 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. 972 973 \item[\np{nn\_isf}~=~3] 974 A simple parameterisation of isf is used. The ice shelf cavity is not represented. 975 The 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}). 977 Full description, sensitivity and validation in preparation. 978 979 \item[\np{nn\_isf}~=~4] 980 The ice shelf cavity is represented. However, the fwf (\np{sn\_fwfisf}) and heat flux (\np{sn\_qisf}) are 981 not 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 990 coarse to have realistic melting or for sensitivity studies where you want to control your input. 991 Full description, sensitivity and validation in preparation. 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}). 998 % 949 999 % ================================================================ 950 1000 % Handling of icebergs
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