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gmaze |
1.1 |
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% [] = compute_alpha(SNAPSHOT) |
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% |
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% This function computes the thermal expansion coefficient from |
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% files of potential temperature THETA and salinity anomaly |
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% SALTanom. |
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% |
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% Files name are: |
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% INPUT: |
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% ./netcdf-files/<SNAPSHOT>/<netcdf_THETA>.<netcdf_domain>.<netcdf_suff> |
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% ./netcdf-files/<SNAPSHOT>/<netcdf_SALTanom>.<netcdf_domain>.<netcdf_suff> |
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% OUTPUT: |
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% ./netcdf-files/<SNAPSHOT>/ALPHA.<netcdf_domain>.<netcdf_suff> |
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% |
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% with: netcdf_* as global variables |
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% |
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% Alpha is computed with the subroutine sw_alpha from package SEAWATER |
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% |
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% 06/27/06 |
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% gmaze@mit.edu |
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function varargout = compute_alpha(snapshot) |
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global sla toshow |
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global netcdf_suff netcdf_domain |
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global netcdf_SALTanom netcdf_THETA |
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pv_checkpath |
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% Path and extension to find netcdf-files: |
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pathname = strcat('netcdf-files',sla); |
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ext = netcdf_suff; |
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% Load files: |
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ferfile = strcat(pathname,sla,snapshot,sla,netcdf_THETA,'.',netcdf_domain,'.',ext); |
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ncT = netcdf(ferfile,'nowrite'); |
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[Tlon Tlat Tdpt] = coordfromnc(ncT); |
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ferfile = strcat(pathname,sla,snapshot,sla,netcdf_SALTanom,'.',netcdf_domain,'.',ext); |
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ncS = netcdf(ferfile,'nowrite'); |
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[Slon Slat Sdpt] = coordfromnc(ncS); % but normaly is the same grid as T |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% surface PV flux |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Define axis: |
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nx = length(Tlon) ; |
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ny = length(Tlat) ; |
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nz = length(Tdpt) ; |
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% Pre-allocation: |
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if toshow,disp('Pre-allocate');end |
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ALPHA = zeros(nz,ny,nx).*NaN; |
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% Compute alpha: |
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for iz = 1 : nz |
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if toshow,disp(strcat('Compute alpha for level:',num2str(iz),'/',num2str(nz)));end |
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TEMP = ncT{4}(iz,:,:); |
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SALT = ncS{4}(iz,:,:) + 35; |
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PRES = (0.09998*9.81*Tdpt(iz))*ones(ny,nx); |
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ALPHA(iz,:,:) = sw_alpha(SALT,TEMP,PRES,'ptmp'); |
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end %for iz |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Record |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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if toshow, disp('record'), end |
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% General informations: |
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netfil = 'ALPHA'; |
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units = '1/K'; |
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ncid = 'ALPHA'; |
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longname = 'Thermal expansion coefficient'; |
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uniquename = 'ALPHA'; |
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% Open output file: |
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nc = netcdf(strcat(pathname,sla,snapshot,sla,netfil,'.',netcdf_domain,'.',ext),'clobber'); |
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% Define axis: |
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nx = length(Tlon) ; |
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ny = length(Tlat) ; |
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nz = length(Tdpt) ; |
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nc('X') = nx; |
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nc('Y') = ny; |
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nc('Z') = nz; |
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nc{'X'} = ncfloat('X'); |
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nc{'X'}.uniquename = ncchar('X'); |
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nc{'X'}.long_name = ncchar('longitude'); |
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nc{'X'}.gridtype = nclong(0); |
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nc{'X'}.units = ncchar('degrees_east'); |
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nc{'X'}(:) = Tlon; |
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nc{'Y'} = ncfloat('Y'); |
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nc{'Y'}.uniquename = ncchar('Y'); |
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nc{'Y'}.long_name = ncchar('latitude'); |
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nc{'Y'}.gridtype = nclong(0); |
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nc{'Y'}.units = ncchar('degrees_north'); |
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nc{'Y'}(:) = Tlat; |
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nc{'Z'} = ncfloat('Z'); |
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nc{'Z'}.uniquename = ncchar('Z'); |
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nc{'Z'}.long_name = ncchar('depth'); |
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nc{'Z'}.gridtype = nclong(0); |
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nc{'Z'}.units = ncchar('m'); |
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nc{'Z'}(:) = Tdpt; |
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% And main field: |
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nc{ncid} = ncfloat('Z', 'Y', 'X'); |
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nc{ncid}.units = ncchar(units); |
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nc{ncid}.missing_value = ncfloat(NaN); |
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nc{ncid}.FillValue_ = ncfloat(NaN); |
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nc{ncid}.longname = ncchar(longname); |
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nc{ncid}.uniquename = ncchar(uniquename); |
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nc{ncid}(:,:,:) = ALPHA; |
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nc=close(nc); |
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