| 1 |
% |
| 2 |
% [Q] = D_compute_potential_vorticity(SNAPSHOT,[WANTSPLPV]) |
| 3 |
% |
| 4 |
% For a time snapshot, this program multiplies the potential |
| 5 |
% vorticity computed with C_COMPUTE_POTENTIAL_VORTICITY by the |
| 6 |
% coefficient: -1/RHO |
| 7 |
% Optional flag WANTSPLPV is turn to 0 by default. Turn it to 1 |
| 8 |
% if the PV computed is the simple one (f.dSIGMATHETA/dz). It's |
| 9 |
% needed for the output netcdf file informations. |
| 10 |
% |
| 11 |
% CAUTION: |
| 12 |
%% If all the PV computing procedure has been performed with routines |
| 13 |
%% from the package, the PV field has less points than the RHO one, exactly |
| 14 |
%% first and last in all directions have to be removed from RHO. |
| 15 |
% |
| 16 |
% Files names are: |
| 17 |
% INPUT: |
| 18 |
% ./netcdf-files/<SNAPSHOT>/<netcdf_RHO>.<netcdf_domain>.<netcdf_suff> |
| 19 |
% ./netcdf-files/<SNAPSHOT>/<netcdf_PV>.<netcdf_domain>.<netcdf_suff> |
| 20 |
% OUPUT: |
| 21 |
% ./netcdf-files/<SNAPSHOT>/PV.<netcdf_domain>.<netcdf_suff> |
| 22 |
% or |
| 23 |
% ./netcdf-files/<SNAPSHOT>/splPV.<netcdf_domain>.<netcdf_suff> |
| 24 |
% |
| 25 |
% 06/21/2006 |
| 26 |
% gmaze@mit.edu |
| 27 |
% |
| 28 |
|
| 29 |
|
| 30 |
function varargout = D_compute_potential_vorticity(snapshot,varargin) |
| 31 |
|
| 32 |
|
| 33 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 34 |
%% Setup |
| 35 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 36 |
global sla netcdf_RHO netcdf_PV netcdf_domain netcdf_suff |
| 37 |
pv_checkpath |
| 38 |
|
| 39 |
%% Flags to choose which term to compute (by default, all): |
| 40 |
FLpv3 = 1; |
| 41 |
if nargin==2 % case of optional flag presents: |
| 42 |
if varargin{1}(1) == 1 % Case of the simple PV: |
| 43 |
FLpv3 = 0; |
| 44 |
end |
| 45 |
end %if |
| 46 |
|
| 47 |
%% PV and RHO netcdf-files: |
| 48 |
filPV = strcat(netcdf_PV ,'.',netcdf_domain); |
| 49 |
filRHO = strcat(netcdf_RHO,'.',netcdf_domain); |
| 50 |
|
| 51 |
%% Path and extension to find them: |
| 52 |
pathname = strcat('netcdf-files',sla,snapshot); |
| 53 |
ext = strcat('.',netcdf_suff); |
| 54 |
|
| 55 |
%% Load netcdf files: |
| 56 |
ferfile = strcat(pathname,sla,filPV,ext); |
| 57 |
ncPV = netcdf(ferfile,'nowrite'); |
| 58 |
[PV_lon PV_lat PV_dpt] = coordfromnc(ncPV); |
| 59 |
|
| 60 |
ferfile = strcat(pathname,sla,filRHO,ext); |
| 61 |
ncRHO = netcdf(ferfile,'nowrite'); |
| 62 |
[RHO_lon RHO_lat RHO_dpt] = coordfromnc(ncRHO); |
| 63 |
|
| 64 |
%% Flags: |
| 65 |
global toshow % Turn to 1 to follow the computing process |
| 66 |
|
| 67 |
|
| 68 |
|
| 69 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 70 |
%% Apply the coefficient |
| 71 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 72 |
|
| 73 |
%% Pre-allocate: |
| 74 |
if toshow,disp('Pre-allocate');end |
| 75 |
nx = length(PV_lon); |
| 76 |
ny = length(PV_lat); |
| 77 |
nz = length(PV_dpt); |
| 78 |
PV = zeros(nz,ny,nx).*NaN; |
| 79 |
|
| 80 |
%% Apply: |
| 81 |
if toshow,disp('Multiplying PV field by -1/RHO'),end |
| 82 |
PV = - ncPV{4}(:,:,:) ./ ncRHO{4}(2:nz+1,2:ny+1,2:nx+1) ; |
| 83 |
|
| 84 |
|
| 85 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 86 |
% Record: |
| 87 |
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| 88 |
if toshow,disp('Now reccording PV file ...'),end |
| 89 |
|
| 90 |
% General informations: |
| 91 |
%ncclose(ncPV); |
| 92 |
|
| 93 |
if FLpv3 == 1 |
| 94 |
netfil = strcat('PV','.',netcdf_domain,'.',netcdf_suff); |
| 95 |
units = '1/s/m'; |
| 96 |
ncid = 'PV'; |
| 97 |
longname = 'Potential vorticity'; |
| 98 |
uniquename = 'potential_vorticity'; |
| 99 |
else |
| 100 |
netfil = strcat('splPV','.',netcdf_domain,'.',netcdf_suff); |
| 101 |
units = '1/s/m'; |
| 102 |
ncid = 'splPV'; |
| 103 |
longname = 'Simple Potential vorticity'; |
| 104 |
uniquename = 'simple_potential_vorticity'; |
| 105 |
end %if |
| 106 |
|
| 107 |
% Open output file: |
| 108 |
nc = netcdf(strcat(pathname,sla,netfil),'clobber'); |
| 109 |
|
| 110 |
% Define axis: |
| 111 |
nc('X') = length(PV_lon); |
| 112 |
nc('Y') = length(PV_lat); |
| 113 |
nc('Z') = length(PV_dpt); |
| 114 |
|
| 115 |
nc{'X'} = 'X'; |
| 116 |
nc{'Y'} = 'Y'; |
| 117 |
nc{'Z'} = 'Z'; |
| 118 |
|
| 119 |
nc{'X'} = ncfloat('X'); |
| 120 |
nc{'X'}.uniquename = ncchar('X'); |
| 121 |
nc{'X'}.long_name = ncchar('longitude'); |
| 122 |
nc{'X'}.gridtype = nclong(0); |
| 123 |
nc{'X'}.units = ncchar('degrees_east'); |
| 124 |
nc{'X'}(:) = PV_lon; |
| 125 |
|
| 126 |
nc{'Y'} = ncfloat('Y'); |
| 127 |
nc{'Y'}.uniquename = ncchar('Y'); |
| 128 |
nc{'Y'}.long_name = ncchar('latitude'); |
| 129 |
nc{'Y'}.gridtype = nclong(0); |
| 130 |
nc{'Y'}.units = ncchar('degrees_north'); |
| 131 |
nc{'Y'}(:) = PV_lat; |
| 132 |
|
| 133 |
nc{'Z'} = ncfloat('Z'); |
| 134 |
nc{'Z'}.uniquename = ncchar('Z'); |
| 135 |
nc{'Z'}.long_name = ncchar('depth'); |
| 136 |
nc{'Z'}.gridtype = nclong(0); |
| 137 |
nc{'Z'}.units = ncchar('m'); |
| 138 |
nc{'Z'}(:) = PV_dpt; |
| 139 |
|
| 140 |
% And main field: |
| 141 |
nc{ncid} = ncfloat('Z', 'Y', 'X'); |
| 142 |
nc{ncid}.units = ncchar(units); |
| 143 |
nc{ncid}.missing_value = ncfloat(NaN); |
| 144 |
nc{ncid}.FillValue_ = ncfloat(NaN); |
| 145 |
nc{ncid}.longname = ncchar(longname); |
| 146 |
nc{ncid}.uniquename = ncchar(uniquename); |
| 147 |
nc{ncid}(:,:,:) = PV; |
| 148 |
|
| 149 |
nc=close(nc); |
| 150 |
close(ncPV); |
| 151 |
close(ncRHO); |
| 152 |
|
| 153 |
% Outputs: |
| 154 |
OUT = struct('PV',PV,'dpt',PV_dpt,'lat',PV_lat,'lon',PV_lon); |
| 155 |
switch nargout |
| 156 |
case 1 |
| 157 |
varargout(1) = {OUT}; |
| 158 |
end |
Parent Directory
| 
Revision Log
| 
Revision Graph