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MERRA Version imprimable
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MERRA
Coverage
Levels
Parameters
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Format
Documents

Levels

Model levels

The GEOS-5 model layers used for MERRA products are on a terrain-following hybrid sigma-p coordinate. Model-level data are output on the LM=72 layers; the indexing for the GEOS-5 vertical coordinate system in the vertical is top to bottom, i.e., layer 1 is the top layer of the atmosphere, while layer LM is adjacent to the earth’s surface.

Note that the full 3-dimensional pressure variables are explicitly provided through the 3D variable DELP ( Layer pressure thickness) and PTOP ( the pressure at the model top is a fixed constant, PTOP=0.01 hPa).

 



Dernière mise à jour : ( 04-07-2013 )
 
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