| 1 |
function grid = mit_loadgrid(varargin); |
| 2 |
% function grid = mit_loadgrid(dname); |
| 3 |
% load the geometry of an arbitrary run with the mitgcm |
| 4 |
|
| 5 |
% Aug 15, 2002: fixed a bug (?): yc' -> yc |
| 6 |
|
| 7 |
if nargin == 0 |
| 8 |
dname = '.'; |
| 9 |
else |
| 10 |
dname = varargin{1}; |
| 11 |
end |
| 12 |
% tracer time step |
| 13 |
deltattracer = mit_getparm(fullfile(dname,'data'),'deltaTtracer'); |
| 14 |
if isempty(deltattracer) |
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error('deltaTtracer is empty') |
| 16 |
end |
| 17 |
gravity = mit_getparm(fullfile(dname,'data'),'gravity'); |
| 18 |
if isempty(gravity); |
| 19 |
disp('assuming gravity = 9.81') |
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gravity = 9.81; |
| 21 |
end |
| 22 |
rhoNil = mit_getparm(fullfile(dname,'data'),'rhonil'); |
| 23 |
if isempty(rhoNil); |
| 24 |
rhoNil = mit_getparm(fullfile(dname,'data'),'rhoNil'); |
| 25 |
end |
| 26 |
if isempty(rhoNil); |
| 27 |
rhoNil = mit_getparm(fullfile(dname,'data'),'rhoConst'); |
| 28 |
end |
| 29 |
if isempty(rhoNil); |
| 30 |
rhoNil = mit_getparm(fullfile(dname,'data'),'rhoconst'); |
| 31 |
end |
| 32 |
if isempty(rhoNil); |
| 33 |
disp('assuming rhoNil = 1035') |
| 34 |
rhoNil = 1035; |
| 35 |
end |
| 36 |
% determine vertical coordinates |
| 37 |
br = mit_getparm(fullfile(dname,'data'),'buoyancyRelation'); |
| 38 |
if isempty(br) |
| 39 |
disp('assuming buoyancyRelation = OCEANIC') |
| 40 |
br = 'OCEANIC'; |
| 41 |
end |
| 42 |
if ~strcmpi(br,'OCEANIC'); |
| 43 |
pfac = 1/rhoNil/gravity; |
| 44 |
else |
| 45 |
pfac = 1; |
| 46 |
end |
| 47 |
% create masks for plotting |
| 48 |
hfac=rdmds(fullfile(dname,'hFacC')); hfacc=change(hfac,'==',0,NaN); |
| 49 |
hfac=rdmds(fullfile(dname,'hFacW')); hfacw=change(hfac,'==',0,NaN); |
| 50 |
hfac=rdmds(fullfile(dname,'hFacS')); hfacs=change(hfac,'==',0,NaN); |
| 51 |
clear hfac; |
| 52 |
cmask=change(hfacc,'>',0,1); |
| 53 |
umask=change(hfacw,'>',0,1); |
| 54 |
vmask=change(hfacs,'>',0,1); |
| 55 |
|
| 56 |
[nx ny nz] = size(cmask); |
| 57 |
|
| 58 |
% find the index of the deepest wet tracer-cell |
| 59 |
klowc = sum(change(cmask,'==',NaN,0),3); |
| 60 |
|
| 61 |
% create grid parameters |
| 62 |
dz = mit_getparm(fullfile(dname,'data'),'delR'); |
| 63 |
if isempty(dz); |
| 64 |
disp('trying delZ') |
| 65 |
dz = mit_getparm(fullfile(dname,'data'),'delZ'); |
| 66 |
if isempty(dz) |
| 67 |
error('vertical grid cannot be established') |
| 68 |
end |
| 69 |
end |
| 70 |
if size(dz,1) == 1; |
| 71 |
dz = dz'; |
| 72 |
end |
| 73 |
if length(dz) ~= nz |
| 74 |
error('dz could not be retrieved correctly from the data file') |
| 75 |
end |
| 76 |
dz = dz*pfac; |
| 77 |
|
| 78 |
if ~strcmp(br,'OCEANIC'); |
| 79 |
dz = dz(end:-1:1); |
| 80 |
end |
| 81 |
zgpsi = [0;cumsum(dz)]; |
| 82 |
zc = .5*(zgpsi(1:nz)+zgpsi(2:nz+1)); |
| 83 |
zg=zgpsi(1:nz); |
| 84 |
|
| 85 |
xc = rdmds(fullfile(dname,'XC')); |
| 86 |
yc = rdmds(fullfile(dname,'YC')); |
| 87 |
xg = rdmds(fullfile(dname,'XG')); |
| 88 |
yg = rdmds(fullfile(dname,'YG')); |
| 89 |
dxc = rdmds(fullfile(dname,'DXC')); |
| 90 |
dyc = rdmds(fullfile(dname,'DYC')); |
| 91 |
dxg = rdmds(fullfile(dname,'DXG')); |
| 92 |
dyg = rdmds(fullfile(dname,'DYG')); |
| 93 |
|
| 94 |
lonc = xc(:,1); |
| 95 |
latc = yc(1,:)'; |
| 96 |
long = xg(:,1); |
| 97 |
latg = yg(1,:)'; |
| 98 |
|
| 99 |
% depth |
| 100 |
depth = rdmds(fullfile(dname,'Depth'))*pfac; |
| 101 |
|
| 102 |
% current directory |
| 103 |
if strcmp(dname,'.') | strcmp(dname,'./') |
| 104 |
[pathstr,dirname,ext]=fileparts(pwd); |
| 105 |
dirname = [dirname ext]; |
| 106 |
else |
| 107 |
[pathstr,dirname,ext]=fileparts(fullfile(pwd,dname)); |
| 108 |
dirname = [dirname ext]; |
| 109 |
end |
| 110 |
|
| 111 |
ius = findstr(dirname,'_'); |
| 112 |
if ~isempty(ius) |
| 113 |
for k=1:length(ius) |
| 114 |
dirname = [dirname(1:ius(k)-1) '\' dirname(ius(k):end)]; |
| 115 |
ius = ius+1; |
| 116 |
end |
| 117 |
end |
| 118 |
% |
| 119 |
if ~strcmp(br,'OCEANIC'); |
| 120 |
hfacc = hfacc(:,:,end:-1:1); |
| 121 |
hfacs = hfacs(:,:,end:-1:1); |
| 122 |
hfacw = hfacw(:,:,end:-1:1); |
| 123 |
cmask = cmask(:,:,end:-1:1); |
| 124 |
umask = umask(:,:,end:-1:1); |
| 125 |
vmask = vmask(:,:,end:-1:1); |
| 126 |
klowc = nz - klowc + 1; |
| 127 |
klowc(find(klowc==nz+1)) = 0; |
| 128 |
end |
| 129 |
|
| 130 |
% area and volume of grid cells has to be done after flipping the masks |
| 131 |
% vertically |
| 132 |
rac = rdmds(fullfile(dname,'RAC')).*cmask(:,:,1); |
| 133 |
ras = rdmds(fullfile(dname,'RAS')).*vmask(:,:,1); |
| 134 |
raw = rdmds(fullfile(dname,'RAW')).*umask(:,:,1); |
| 135 |
rac3d = repmat(rac,[1 1 nz]).*hfacc; |
| 136 |
volc = rac3d.*permute(repmat(dz,[1 nx ny]),[2 3 1]); |
| 137 |
% create the structure |
| 138 |
% Aug 15, 2002: fixed a bug (?): yc' -> yc |
| 139 |
grid = struct('dname',dirname, ... |
| 140 |
'deltattracer',deltattracer, ... |
| 141 |
'gravity',gravity','rhonil',rhoNil, ... |
| 142 |
'buoyancy',br,'pfac',pfac, ... |
| 143 |
'nx',nx,'ny',ny,'nz',nz, ... |
| 144 |
'xc',xc,'yc',yc,'xg',xg,'yg',yg, ... |
| 145 |
'lonc',lonc,'latc',latc,'long',long,'latg',latg, ... |
| 146 |
'dxc',dxc,'dyc',dyc,'dxg',dxg,'dyg',dyg, ... |
| 147 |
'rac',rac,'ras',ras,'raw',raw, ... |
| 148 |
'dz',dz,'zc',zc,'zg',zg,'zgpsi',zgpsi, ... |
| 149 |
'depth',depth,'hfacc',hfacc,'hfacs',hfacs,'hfacw',hfacw, ... |
| 150 |
'cmask',cmask,'umask',umask,'vmask',vmask,'volc',volc, ... |
| 151 |
'klowc',klowc); |
| 152 |
|
| 153 |
return |
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