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%This program creates open boundary prescription files for the PIG |
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%experiment based on the 10 yrs spin-up run using OBCS with |
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%U,V = 0, Tref, Sref |
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|
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%following variables |
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%-----3D fields----- |
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% T Temperature (C) |
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% S Salinity (psu) |
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% U u-velocity (m/s) |
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% PH ocean pressure (or atm geopotential) |
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%Set the grid size; |
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nx = 3; delx = 1; X = nx*delx; |
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ny = 400; dely = 1; Y = ny*dely; |
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nz = 100; delz = 10; Z = nz*delz; |
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%x axis |
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x = 1:delx:X; |
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%y axis |
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y = 1:dely:Y; |
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%z axis [m] |
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z = delz:delz:Z; |
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%Note: |
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%Ensure that the volume flux is zero at the open boundary |
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%% ________________________________________________________________________ |
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% First try: linear velocity profile. |
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% From U = -0.025 ms-1 (outwards) to 0.025 ms-1 |
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% Constant in y direction (meridionally) |
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% Do not take exactly Umin and Umax from the OBC of the original |
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% experiment: Take modified numbers to that Umin = -Umax and volume is conserved |
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% Initialize variable |
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V_OBC(1:nx,1:nz) = NaN; |
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v_sfc = 0.025; %U at sfc |
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v_bottom = -0.025; %U at bottom |
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del_v = (v_bottom - v_sfc)/((nz-1)*delz); %delu/delz |
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|
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for iz = 1:nz; |
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V_OBC(1:nx,iz) = v_sfc + del_v*((iz-1)*delz); |
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end |
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|
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% Linear T profile |
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% From Tmin at sfc increasing to Tmax at bottom |
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% Take Tmin and Tmax from the OBC of the original PIG experiment |
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% Initialize variable |
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T_OBC(1:nx,1:nz) = NaN; |
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|
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T_sfc = -1.9; |
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T_bottom = 1.1967; |
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del_T = (T_bottom - T_sfc)/((nz-1)*delz); |
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|
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for iz = 1:nz; |
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T_OBC(1:nx,iz) = T_sfc + del_T*((iz-1)*delz); |
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end |
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% Linear S profile |
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% From Smin at sfc increasing to Smax at bottom |
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% Take Smin and Smax from the OBC of the original PIG experiment |
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% Initialize variable |
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S_OBC(1:nx,1:nz) = NaN; |
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|
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S_sfc = 34.2050; |
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S_bottom = 34.6967; |
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del_S = (S_bottom - S_sfc)/((nz-1)*delz); |
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|
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for iz = 1:nz; |
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S_OBC(1:nx,iz) = S_sfc + del_S*((iz-1)*delz); |
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end |
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|
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%% Initial T & S conditions |
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% Take western open boundary conditions for T & S |
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% and assume no change in x-direction |
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|
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T_init = zeros(nx,ny,nz); |
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S_init = zeros(nx,ny,nz); |
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for iy = 1:ny; |
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T_init(:,iy,:) = T_OBC; |
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S_init(:,iy,:) = S_OBC; |
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end |
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%% Print OBCS files for T, S |
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% fid=fopen('uvel.obw','w','b'); fprintf(fid,'%10.4f',U_OBC);fclose(fid); |
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fid=fopen('vvel.obw','w','b'); fwrite(fid,V_OBC,'real*8'); fclose(fid); |
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% fid=fopen('uvel.obw','w','b'); fwrite(fid,U_OBC,'real*8'); fclose(fid); |
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fid=fopen('theta.obw','w','b'); fwrite(fid,T_OBC,'real*8'); fclose(fid); |
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fid=fopen('salt.obw','w','b'); fwrite(fid,S_OBC,'real*8'); fclose(fid); |
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% fid=fopen('theta.obw','w'); fprintf(fid,'%10.4f',T_OBC);fclose(fid); |
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% fid=fopen('salt.obw','w'); fprintf(fid,'%10.4f',S_OBC);fclose(fid); |
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%% Print init files for T, S |
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fid_T=fopen('theta.init','w','b');fwrite(fid,T_init,'real*8');fclose(fid); |
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fid_T=fopen('salt.init','w','b');fwrite(fid,S_init,'real*8');fclose(fid); |
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% for iz = 1:nz; |
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% fprintf(fid_T,'%10.4f',T_init(:,:,iz)); |
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% fprintf(fid_S,'%10.4f',S_init(:,:,iz)); |
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% end |
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% |
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% fclose(fid_T); |
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% fclose(fid_S); |
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