README -- Describes contents of HEMCO/NOAA_GMD/2023-10/ directory
06 Oct 2023
GEOS-Chem Support Team

Overview:
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This directory contains monthly mean surface methane mixing ratios spatially
interpolated from NOAA GLOBALVIEW discrete monthly mean flask data using
ordinary kriging for 1983-2021. Surface mixing ratios are extended back to 1975
and forward to 2022 via linear extrapolation of the local 1983-1990 and
2018-2021 trends, respectively.

The included netCDF file was provided by Lee Murray (Aug 2023).

For more information, please see this wiki page:


Files:
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monthly.gridded.surface.methane.1975-2022.1x1.nc

 -- Monthly mean surface methane mixing ratio

    Resolution  : Generic 1 x 1
    Units       : ppbv
    Timestamp   : 1975-2022/1-12/1
    Compression : Level 9 (e.g. nccopy -d9)

References:
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(1) Murray, L. T. (2016), Lightning NOx and Impacts on Air Quality, Curr. Poll.
    Rep., 2(2), 115-133, doi:10.1007/s40726-016-0031-7.