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MERRA-2 incidnet longwave radiation

Posted: Thu Jul 08, 2021 12:06 pm America/New_York
by xgao
Dear Sir/Madam,

I am wondering how to derive the incident longwave radiation from MERRA-2, such as the one commonly used to drive land surface models offline as one of the main near-surface meteorological forcing variables.

I find several relevant variables in radiation diagnostics of MERRA-2 (M2T1NXRAD), such as
surface net downward longwave flux (LWGNT)
surface absorbed longwave radiation (LWGAB)
Longwave flux emitted from surface (LWGEM)

I am wondering if the incident longwave radiation is simply equal to "LWGAB + LWGNT"



Re: MERRA-2 incidnet longwave radiation

Posted: Fri Jul 09, 2021 5:02 pm America/New_York
by GES DISC - jimacker

This short FAQ may assist with your question: ... diation%3F

Please reply if additional information is required.