| 1 |
mlosch |
1.1 |
function grid = mit_loadgrid(varargin); |
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% function grid = mit_loadgrid(dname); |
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% load the geometry of an arbitrary run with the mitgcm |
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| 5 |
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% Aug 15, 2002: fixed a bug (?): yc' -> yc |
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| 7 |
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if nargin == 0 |
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dname = '.'; |
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else |
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dname = varargin{1}; |
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end |
| 12 |
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% tracer time step |
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deltattracer = mit_getparm(fullfile(dname,'data'),'deltaTtracer'); |
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if isempty(deltattracer) |
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error('deltaTtracer is empty') |
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end |
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gravity = mit_getparm(fullfile(dname,'data'),'gravity'); |
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if isempty(gravity); |
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disp('assuming gravity = 9.81') |
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gravity = 9.81; |
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end |
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rhoNil = mit_getparm(fullfile(dname,'data'),'rhonil'); |
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if isempty(rhoNil); |
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rhoNil = mit_getparm(fullfile(dname,'data'),'rhoNil'); |
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end |
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if isempty(rhoNil); |
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rhoNil = mit_getparm(fullfile(dname,'data'),'rhoConst'); |
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end |
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if isempty(rhoNil); |
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rhoNil = mit_getparm(fullfile(dname,'data'),'rhoconst'); |
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end |
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if isempty(rhoNil); |
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disp('assuming rhoNil = 1035') |
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rhoNil = 1035; |
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end |
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% determine vertical coordinates |
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br = mit_getparm(fullfile(dname,'data'),'buoyancyRelation'); |
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if isempty(br) |
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disp('assuming buoyancyRelation = OCEANIC') |
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br = 'OCEANIC'; |
| 41 |
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end |
| 42 |
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if ~strcmpi(br,'OCEANIC'); |
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pfac = 1/rhoNil/gravity; |
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else |
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pfac = 1; |
| 46 |
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end |
| 47 |
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% create masks for plotting |
| 48 |
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hfac=rdmds(fullfile(dname,'hFacC')); hfacc=change(hfac,'==',0,NaN); |
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hfac=rdmds(fullfile(dname,'hFacW')); hfacw=change(hfac,'==',0,NaN); |
| 50 |
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hfac=rdmds(fullfile(dname,'hFacS')); hfacs=change(hfac,'==',0,NaN); |
| 51 |
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clear hfac; |
| 52 |
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cmask=change(hfacc,'>',0,1); |
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umask=change(hfacw,'>',0,1); |
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vmask=change(hfacs,'>',0,1); |
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| 56 |
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[nx ny nz] = size(cmask); |
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| 58 |
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% find the index of the deepest wet tracer-cell |
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klowc = sum(change(cmask,'==',NaN,0),3); |
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| 61 |
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% create grid parameters |
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dz = mit_getparm(fullfile(dname,'data'),'delR'); |
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if isempty(dz); |
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disp('trying delZ') |
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dz = mit_getparm(fullfile(dname,'data'),'delZ'); |
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if isempty(dz) |
| 67 |
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error('vertical grid cannot be established') |
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end |
| 69 |
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end |
| 70 |
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if size(dz,1) == 1; |
| 71 |
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dz = dz'; |
| 72 |
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end |
| 73 |
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if length(dz) ~= nz |
| 74 |
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error('dz could not be retrieved correctly from the data file') |
| 75 |
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end |
| 76 |
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dz = dz*pfac; |
| 77 |
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| 78 |
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if ~strcmp(br,'OCEANIC'); |
| 79 |
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dz = dz(end:-1:1); |
| 80 |
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end |
| 81 |
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zgpsi = [0;cumsum(dz)]; |
| 82 |
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zc = .5*(zgpsi(1:nz)+zgpsi(2:nz+1)); |
| 83 |
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zg=zgpsi(1:nz); |
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| 85 |
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xc = rdmds(fullfile(dname,'XC')); |
| 86 |
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yc = rdmds(fullfile(dname,'YC')); |
| 87 |
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xg = rdmds(fullfile(dname,'XG')); |
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yg = rdmds(fullfile(dname,'YG')); |
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dxc = rdmds(fullfile(dname,'DXC')); |
| 90 |
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dyc = rdmds(fullfile(dname,'DYC')); |
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dxg = rdmds(fullfile(dname,'DXG')); |
| 92 |
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dyg = rdmds(fullfile(dname,'DYG')); |
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| 94 |
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lonc = xc(:,1); |
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latc = yc(1,:)'; |
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long = xg(:,1); |
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latg = yg(1,:)'; |
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| 99 |
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% depth |
| 100 |
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depth = rdmds(fullfile(dname,'Depth'))*pfac; |
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% current directory |
| 103 |
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if strcmp(dname,'.') | strcmp(dname,'./') |
| 104 |
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[pathstr,dirname,ext]=fileparts(pwd); |
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dirname = [dirname ext]; |
| 106 |
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else |
| 107 |
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[pathstr,dirname,ext]=fileparts(fullfile(pwd,dname)); |
| 108 |
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dirname = [dirname ext]; |
| 109 |
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end |
| 110 |
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| 111 |
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ius = findstr(dirname,'_'); |
| 112 |
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if ~isempty(ius) |
| 113 |
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for k=1:length(ius) |
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dirname = [dirname(1:ius(k)-1) '\' dirname(ius(k):end)]; |
| 115 |
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ius = ius+1; |
| 116 |
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end |
| 117 |
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end |
| 118 |
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% |
| 119 |
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if ~strcmp(br,'OCEANIC'); |
| 120 |
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hfacc = hfacc(:,:,end:-1:1); |
| 121 |
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hfacs = hfacs(:,:,end:-1:1); |
| 122 |
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hfacw = hfacw(:,:,end:-1:1); |
| 123 |
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cmask = cmask(:,:,end:-1:1); |
| 124 |
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umask = umask(:,:,end:-1:1); |
| 125 |
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vmask = vmask(:,:,end:-1:1); |
| 126 |
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klowc = nz - klowc + 1; |
| 127 |
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klowc(find(klowc==nz+1)) = 0; |
| 128 |
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end |
| 129 |
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| 130 |
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% area and volume of grid cells has to be done after flipping the masks |
| 131 |
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% vertically |
| 132 |
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rac = rdmds(fullfile(dname,'RAC')).*cmask(:,:,1); |
| 133 |
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ras = rdmds(fullfile(dname,'RAS')).*vmask(:,:,1); |
| 134 |
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raw = rdmds(fullfile(dname,'RAW')).*umask(:,:,1); |
| 135 |
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rac3d = repmat(rac,[1 1 nz]).*hfacc; |
| 136 |
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volc = rac3d.*permute(repmat(dz,[1 nx ny]),[2 3 1]); |
| 137 |
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% create the structure |
| 138 |
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% Aug 15, 2002: fixed a bug (?): yc' -> yc |
| 139 |
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grid = struct('dname',dirname, ... |
| 140 |
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'deltattracer',deltattracer, ... |
| 141 |
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'gravity',gravity','rhonil',rhoNil, ... |
| 142 |
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'buoyancy',br,'pfac',pfac, ... |
| 143 |
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'nx',nx,'ny',ny,'nz',nz, ... |
| 144 |
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'xc',xc,'yc',yc,'xg',xg,'yg',yg, ... |
| 145 |
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'lonc',lonc,'latc',latc,'long',long,'latg',latg, ... |
| 146 |
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'dxc',dxc,'dyc',dyc,'dxg',dxg,'dyg',dyg, ... |
| 147 |
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'rac',rac,'ras',ras,'raw',raw, ... |
| 148 |
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'dz',dz,'zc',zc,'zg',zg,'zgpsi',zgpsi, ... |
| 149 |
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'depth',depth,'hfacc',hfacc,'hfacs',hfacs,'hfacw',hfacw, ... |
| 150 |
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'cmask',cmask,'umask',umask,'vmask',vmask,'volc',volc, ... |
| 151 |
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'klowc',klowc); |
| 152 |
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| 153 |
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return |
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