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pro zonal_npp
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cdfid=ncdf_open('npp_T42_mean_2000-2004.nc')
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lon_dimid=ncdf_dimid(cdfid,'lon')
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ncdf_diminq,cdfid,lon_dimid,lon_name,lon_size
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lat_dimid=ncdf_dimid(cdfid,'lat')
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ncdf_diminq,cdfid,lat_dimid,lat_name,lat_size
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lon_varid=ncdf_varid(cdfid,'lon')
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ncdf_varget,cdfid,lon_varid,lon
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lat_varid=ncdf_varid(cdfid,'lat')
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ncdf_varget,cdfid,lat_varid,lat
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npp_varid=ncdf_varid(cdfid,'NPP')
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ncdf_varget,cdfid,npp_varid,npp
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ncdf_attget,cdfid,npp_varid,'long_name',long_name
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ncdf_attget,cdfid,npp_varid,'_FillValue',missing_value
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ncdf_attget,cdfid,npp_varid,'units',units
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ncdf_close,cdfid
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npp_zmean=fltarr(lat_size)
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npp_zstddev=fltarr(lat_size)
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for i=0,lat_size-1 do begin
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vdata = npp[*,i]
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idx = where(vdata ne missing_value,cnt)
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if cnt gt 0 then begin
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npp_zmean[i] = mean(vdata[where(vdata ne missing_value)])
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endif else begin
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npp_zmean[i] = 0.
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endelse
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if cnt gt 1 then begin
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npp_zstddev[i] = stddev(vdata[where(vdata ne missing_value)])
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endif else begin
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npp_zstddev[i] = 0.
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endelse
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endfor
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ofname='npp_T42_mean_2000-2004_zonal.dat'
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openw,1,ofname
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printf,1,' Latitude ZonalMean_NPP ZonalStdDev_NPP'
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for i=0,lat_size-1 do begin
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printf,1,lat[i],npp_zmean[i],npp_zstddev[i]
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endfor
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close,1
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return
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end
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