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;---------------------------------------------------------------
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; convert from 1x1 to T31/T42
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;
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; use model T31/T42 lat and lon
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; output model area, too.
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;
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;-------------------------------------------------------------
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load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
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load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
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load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
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undef("copyatt")
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load "/fis/cgd/cseg/people/jeff/ncl/remap_areaave.ncl"
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begin
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;************************************************
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; output data
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;************************************************
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diro = "/fis/cgd/cseg/people/jeff/fire_data/ob/GFEDv2_C/"
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filo = "Fire_C_1997-2006_monthly_1.9.nc"
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c = addfile(diro+filo,"c")
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filedimdef(c,"year",-1,True)
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;******************************************************
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; input grid: 1deg x 1deg, N->S, 180W-180E
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;******************************************************
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diri = "/fis/cgd/cseg/people/jeff/fire_data/ob/GFEDv2_C/"
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fili = "Fire_C_1997-2006_monthly_1x1.nc"
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g = addfile (diri+fili,"r")
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bi = g->FIRE_C
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xi = g->lon
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yi = g->lat
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dsizes = dimsizes(bi)
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nyear = dsizes(0)
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nmonth = dsizes(1)
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nlatx = dsizes(2)
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nlonx = dsizes(3)
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;===================================================
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; change from 180W-180E, 90N-90S to 0-360E, 90S-90N
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;===================================================
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yi = (/ yi(::-1) /)
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bi = (/ bi(:,:,::-1,:) /)
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b2 = bi
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x2 = xi
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do i= 0,nlonx-1
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if (i .lt. 180) then
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p = i + 180
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xi(p) = x2(i) + 360.
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else
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p = i - 180
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xi(p) = x2(i)
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end if
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bi(:,:,:,p)= b2(:,:,:,i)
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end do
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bi&lat = yi
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bi&lon = xi
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print (xi)
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print (yi)
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;==================================================
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; edges
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;==================================================
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xi_edge = fspan(0.0, 360.0, nlonx+1)
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xi_edge@units = "degrees_east"
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yi_edge = fspan(-90.0, 90.0, nlatx+1)
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yi_edge@units = "degrees_north"
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;==================================================
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; area
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;==================================================
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deg2rad = 4.0*atan(1.0)/180.0
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earth_rad = 6.37122e6
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dx = earth_rad * deg2rad * (xi_edge(1)-xi_edge(0))
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dsin = sin(deg2rad*yi_edge(1:180)) - sin(deg2rad*yi_edge(0:179))
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area_in = new((/ nlatx, nlonx /), float)
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area_in = conform(area_in, earth_rad*dx*dsin,0)
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area_in@units = "m^2"
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;**************************************************************
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; output grid: (0-360), (90S-90N)
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;**************************************************************
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; interpolate into model T31/T42, using model lat and lon
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diri = "/fis/cgd/cseg/people/jeff/surface_data/"
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fili = "lnd_1.9.nc"
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b = addfile(diri+fili,"r")
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yo = b->lat
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xo = b->lon
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nlat = dimsizes(yo)
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nlon = dimsizes(xo)
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xo_edge = fspan(0.0, 360.0, nlon+1) - 0.5*360.0/nlon
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xo_edge@units = "degrees_east"
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yo_edge = new(nlat+1, float)
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gau_info = gaus(nlat/2)
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yo_edge(0) = -90.0
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yo_edge(1:nlat-1) = doubletofloat(0.5*(gau_info(0:nlat-2,0)+gau_info(1:nlat-1,0)))
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yo_edge(nlat) = 90.0
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yo_edge@units = "degrees_north"
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; yo = 0.5*(yo_edge(0:nlat-1) + yo_edge(1:nlat))
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; yo@units = yo_edge@units
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; xo = 0.5*(xo_edge(0:nlon-1) + xo_edge(1:nlon))
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; xo@units = xo_edge@units
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;===================================================
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; output
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;===================================================
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w = new((/nyear,nmonth,nlat,nlon/),float)
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do m = 0,nyear-1
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do n = 0,nmonth-1
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w(m,n,:,:) = remap_areaave(xi_edge, yi_edge, bi(m,n,:,:), xo_edge, yo_edge)
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end do
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end do
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w!0 = "year"
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w!1 = "month"
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w!2 = "lat"
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w&lat = yo
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w!3 = "lon"
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w&lon = xo
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w@units = bi@units
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w@long_name = bi@long_name
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w@_FillValue = bi@_FillValue
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c->FIRE_C = w
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c->date = g->date
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c->area = b->area
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end
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