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[M2I6NPANA] Missing values in air temperature

Posted: Sun Sep 24, 2023 4:54 am America/New_York
by takaaki09
I am using the M2I6NPANA product to obtain air temperature data for different pressure levels in South Asian countries. I have seen corresponding values for most regions, but have encountered some NA/NaN values in some places. I tried to see if this was documented in the FAQs and other notes, but I could not find them.

Could you please guide me to the appropriate answers if already documented, or tell me what would be the causes of producing NA values?

Thank you for your kind support.

Re: [M2I6NPANA] Missing values in air temperature

Posted: Mon Sep 25, 2023 8:15 am America/New_York
by GES DISC - mgreene
Our MERRA-2 data and subject matter experts will examine your question and formulate a reply shortly.

Re: [M2I6NPANA] Missing values in air temperature

Posted: Mon Sep 25, 2023 10:22 am America/New_York
by GES DISC - mgreene
Hello,
MERRA-2 has not extrapolated data beneath the surface. The result is that
lower pressure levels, such as 1000, 925, and 850 hPa may consist of missing
data if it is below the surface. More information can be found in the FAQ of
the MERRA-2 project page :

https://gmao.gsfc.nasa.gov/reanalysis/MERRA-2/FAQ/

WHY ARE THERE SUCH LARGE DISCREPANCIES AT 1000MB AND 850MB BETWEEN MERRA AND
OTHER REANALYSES?