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gmaze |
1.1 |
% |
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gmaze |
1.3 |
% [Q] = D_compute_potential_vorticity(SNAPSHOT,[WANTSPLPV]) |
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gmaze |
1.1 |
% |
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% For a time snapshot, this program multiplies the potential |
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% vorticity computed with C_COMPUTE_POTENTIAL_VORTICITY by the |
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% coefficient: -1/RHO |
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% Optional flag WANTSPLPV is turn to 0 by default. Turn it to 1 |
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gmaze |
1.2 |
% if the PV computed is the simple one (f.dSIGMATHETA/dz). It's |
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% needed for the output netcdf file informations. |
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gmaze |
1.1 |
% |
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gmaze |
1.2 |
% CAUTION: |
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gmaze |
1.3 |
%% If all the PV computing procedure has been performed with routines |
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gmaze |
1.2 |
%% from the package, the PV field has less points than the RHO one, exactly |
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%% first and last in all directions have to be removed from RHO. |
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% |
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% Files names are: |
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% INPUT: |
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% ./netcdf-files/<SNAPSHOT>/<netcdf_RHO>.<netcdf_domain>.<netcdf_suff> |
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% ./netcdf-files/<SNAPSHOT>/<netcdf_PV>.<netcdf_domain>.<netcdf_suff> |
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% OUPUT: |
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% ./netcdf-files/<SNAPSHOT>/PV.<netcdf_domain>.<netcdf_suff> |
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% or |
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% ./netcdf-files/<SNAPSHOT>/splPV.<netcdf_domain>.<netcdf_suff> |
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% |
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gmaze |
1.1 |
% 06/21/2006 |
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% gmaze@mit.edu |
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% |
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function D_compute_potential_vorticity(snapshot,varargin) |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%% Setup |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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global sla netcdf_RHO netcdf_PV netcdf_domain netcdf_suff |
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pv_checkpath |
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%% Flags to choose which term to compute (by default, all): |
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FLpv3 = 1; |
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if nargin==2 % case of optional flag presents: |
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if varargin{1}(1) == 1 % Case of the simple PV: |
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FLpv3 = 0; |
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end |
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end %if |
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%% PV and RHO netcdf-files: |
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filPV = strcat(netcdf_PV ,'.',netcdf_domain); |
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filRHO = strcat(netcdf_RHO,'.',netcdf_domain); |
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%% Path and extension to find them: |
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pathname = strcat('netcdf-files',sla,snapshot); |
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ext = strcat('.',netcdf_suff); |
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%% Load netcdf files: |
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ferfile = strcat(pathname,sla,filPV,ext); |
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ncPV = netcdf(ferfile,'nowrite'); |
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[PV_lon PV_lat PV_dpt] = coordfromnc(ncPV); |
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ferfile = strcat(pathname,sla,filRHO,ext); |
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ncRHO = netcdf(ferfile,'nowrite'); |
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[RHO_lon RHO_lat RHO_dpt] = coordfromnc(ncRHO); |
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%% Flags: |
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global toshow % Turn to 1 to follow the computing process |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%% Apply the coefficient |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%% Pre-allocate: |
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if toshow,disp('Pre-allocate');end |
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gmaze |
1.2 |
nx = length(PV_lon); |
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ny = length(PV_lat); |
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nz = length(PV_dpt); |
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PV = zeros(nz,ny,nx).*NaN; |
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gmaze |
1.1 |
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%% Apply: |
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if toshow,disp('Multiplying PV field by -1/RHO'),end |
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gmaze |
1.2 |
PV = - ncPV{4}(:,:,:) ./ ncRHO{4}(2:nz+1,2:ny+1,2:nx+1) ; |
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gmaze |
1.1 |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Record: |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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if toshow,disp('Now reccording PV file ...'),end |
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% General informations: |
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gmaze |
1.2 |
%ncclose(ncPV); |
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gmaze |
1.1 |
if FLpv3 == 1 |
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netfil = strcat('PV','.',netcdf_domain,'.',netcdf_suff); |
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units = '1/s/m'; |
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ncid = 'PV'; |
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longname = 'Potential vorticity'; |
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uniquename = 'potential_vorticity'; |
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else |
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netfil = strcat('splPV','.',netcdf_domain,'.',netcdf_suff); |
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units = '1/s/m'; |
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ncid = 'splPV'; |
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longname = 'Simple Potential vorticity'; |
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uniquename = 'simple_potential_vorticity'; |
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end %if |
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% Open output file: |
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nc = netcdf(strcat(pathname,sla,netfil),'clobber'); |
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% Define axis: |
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nc('X') = length(PV_lon); |
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nc('Y') = length(PV_lat); |
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nc('Z') = length(PV_dpt); |
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nc{'X'} = 'X'; |
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nc{'Y'} = 'Y'; |
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nc{'Z'} = 'Z'; |
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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'}(:) = PV_lon; |
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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'}(:) = PV_lat; |
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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'}(:) = PV_dpt; |
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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}(:,:,:) = PV; |
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nc=close(nc); |
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gmaze |
1.3 |
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% Outputs: |
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OUT = struct('value',PV,'dpt',PV_dpt,'lat',PV_lat,'lon',PV_lon); |
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switch nargout |
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case 1 |
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varargout(1) = OUT; |
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end |
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