Model domain description
Mercury emissions were distributed into two regular grids covering the entire globe and based on the latitude/longitude coordinate system: the Z05 grid comprising 259200 (720 x 360) grid cells with a cell size of 0.5 x 0.5 degrees, and the (so-called) GEIA grid comprising 64800 (360 x 180) grid cells with a cell size of 1 x 1 degrees.
The grids are defined as follows:
Z05 (0.5 x 0.5 degree) grid definition:
259200 (720 x 360) cells
Z05 cell code = (j*1000) + i
j = row number starting at 1 for 90S to 89.5S latitude, to 360 for 89.5N to 90N latitude
i = column number starting at 1 for 180W to 179.5W longitude, to 720 for 179.5E to 180E longitude.
(coordinates represent the center of the grid cell)
The latitude and longitude of the center of a grid cell is given by:
latitude = ((j-181)/2) + 0.25
longitude = ((i-361)/2) + 0.25
GEIA (1 x 1 degree ) grid definition
GEIA cell code = (j*1000) + i
j = row number starting at 1 for 90S to 89S latitude, to 180 for 89N to 90N latitude
i = column number starting at 1 for 180W to 179W longitude, to 360 for 179E to 180E longitude.
(coordinates represent the center of the grid cell)
The latitude and longitude of the center of the grid is given by:
latitude = (j-91) + 0.5
longitude = (i-181) + 0.5
| Last modified: | 14 February 2019 5.23 p.m. |