matlab_class/gcmfaces_calc/calc_zonmean_T.m

function [FLD]=calc_zonmean_T(fld,LATS_MASKS);
%object:    compute zonal mean
%inputs:    fld is the field of interest
%           LATS_MASKS is the set of quasi longitudinal lines along
%               which transports will integrated (LATS_MASKS should 
%               have been produced by line_zonal_TUV_MASKS.m)
%output:    FLD is the zonal mean field

global mygrid;

%initialize output:
n3=max(size(fld.f1,3),1); n4=max(size(fld.f1,4),1);
FLD=NaN*squeeze(zeros(length(LATS_MASKS),n3,n4));

%use array format to speed up computation below:
fld=convert2array(fld); 
n1=size(fld,1); n2=size(fld,2); 
fld=reshape(fld,n1*n2,n3*n4); 
fld(isnan(fld))=0;
rac=reshape(convert2array(mygrid.RAC),n1*n2,1)*ones(1,n3*n4);
if n3==length(mygrid.RC); 
   hFacC=reshape(convert2array(mygrid.hFacC),n1*n2,n3*n4);
else; 
   hFacC=reshape(convert2array(mygrid.mskC(:,:,1)),n1*n2,1)*ones(1,n3*n4);
   hFacC(isnan(hFacC))=0;
end;
rac=rac.*hFacC;
fld=fld.*rac;

%masked area only:
rac(isnan(fld))=0;

for iy=1:length(LATS_MASKS); 

   %get list ofpoints that form a zonal band:
   mm=convert2array(LATS_MASKS(iy).mmt);
   mm=find(~isnan(mm));

   %do the area weighed average along this band: 
   tmp1=sum(fld(mm,:),1); 
   tmp2=sum(rac(mm,:),1); 
   tmp2(tmp2==0)=NaN;
   tmp1=tmp1./tmp2;

   %store:
   FLD(iy,:,:)=reshape(tmp1,n3,n4);

end; 


1	gforget	1.1	function [FLD]=calc_zonmean_T(fld,LATS_MASKS);
2	gforget	1.3	%object: compute zonal mean
3			%inputs: fld is the field of interest
4			% LATS_MASKS is the set of quasi longitudinal lines along
5			% which transports will integrated (LATS_MASKS should
6			% have been produced by line_zonal_TUV_MASKS.m)
7			%output: FLD is the zonal mean field
8	gforget	1.1
9			global mygrid;
10
11			%initialize output:
12			n3=max(size(fld.f1,3),1); n4=max(size(fld.f1,4),1);
13			FLD=NaN*squeeze(zeros(length(LATS_MASKS),n3,n4));
14
15			%use array format to speed up computation below:
16			fld=convert2array(fld);
17			n1=size(fld,1); n2=size(fld,2);
18			fld=reshape(fld,n1n2,n3n4);
19			fld(isnan(fld))=0;
20			rac=reshape(convert2array(mygrid.RAC),n1n2,1)ones(1,n3*n4);
21			if n3==length(mygrid.RC);
22			hFacC=reshape(convert2array(mygrid.hFacC),n1n2,n3n4);
23			else;
24	gforget	1.2	hFacC=reshape(convert2array(mygrid.mskC(:,:,1)),n1n2,1)ones(1,n3*n4);
25			hFacC(isnan(hFacC))=0;
26	gforget	1.1	end;
27			rac=rac.*hFacC;
28			fld=fld.*rac;
29
30	gforget	1.2	%masked area only:
31			rac(isnan(fld))=0;
32	gforget	1.1
33			for iy=1:length(LATS_MASKS);
34
35			%get list ofpoints that form a zonal band:
36			mm=convert2array(LATS_MASKS(iy).mmt);
37			mm=find(~isnan(mm));
38
39			%do the area weighed average along this band:
40			tmp1=sum(fld(mm,:),1);
41			tmp2=sum(rac(mm,:),1);
42			tmp2(tmp2==0)=NaN;
43			tmp1=tmp1./tmp2;
44
45			%store:
46			FLD(iy,:,:)=reshape(tmp1,n3,n4);
47
48			end;
49
50