area of rotated lat/lon grid cells?

Hello,

I am working with data that are on a rotated pole grid with rotated
latitude and longitude coordinates and associated two-dimensional latitude
and longitude variables. I would like to calculate the area of each grid
cell. Could someone please advise how to do this?

Thank you.

My data are structured as follows:

 dimensions:
   rlon = 424;
   rlat = 412;
 variables:
   float ta200(rlat=412, rlon=424);
     :standard_name = "air_temperature";
     :long_name = "Air Temperature";
     :units = "K";
     :coordinates = "lon lat plev";
     :grid_mapping = "rotated_pole";
   char rotated_pole;
     :grid_north_pole_longitude = -162.0; // double
     :grid_mapping_name = "rotated_latitude_longitude";
     :grid_north_pole_latitude = 39.25; // double
   double lon(rlat=412, rlon=424);
     :standard_name = "longitude";
     :long_name = "longitude";
     :units = "degrees_east";
   double lat(rlat=412, rlon=424);
     :standard_name = "latitude";
     :long_name = "latitude";
     :units = "degrees_north";
   double rlon(rlon=424);
     :standard_name = "grid_longitude";
     :long_name = "longitude in rotated pole grid";
     :units = "degrees";
     :axis = "X";
   double rlat(rlat=412);
     :standard_name = "grid_latitude";
     :long_name = "latitude in rotated pole grid";
     :units = "degrees";
     :axis = "Y";

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Received on Thu Mar 6 13:29:01 2014