Add CYGNSS soil moisture observation reader #76
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…ure/amfox/cygnss_obs_reader
…m_ensupd_read_obs.F90)
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@amfox37, I added a few comments and questions. I might have misunderstood bits and pieces. I currently don't have access to Discover or GMAO Linux servers, so working entirely with the GitHub.com interface, which is somewhat limiting.
…ULT_inputs_ensupd.nml)
… check that dtstep_assim<=6h for CYGNSS sm obs (clsm_ensupd_read_obs.F90, clsm_ensupd_upd_routines.F90)
amfox37
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Jan 30, 2025
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After e274718
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gmao-rreichle
approved these changes
Jan 31, 2025
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This PR aims to add ability to read CYGNSS L3 soil moisture daily and subdaily soil moisture v3.2 observations from daily files available from: https://podaac.jpl.nasa.gov/dataset/CYGNSS_L3_SOIL_MOISTURE_V3.2
Subdaily observations represent 6 hour long time slices and are assimilated at 3z, 9z, 15z, 21z. Daily observations are assimilated at 12z. NB It is not anticipated both subdaily and daily observations will be jointly assimilated, although the code alllows this.
There is no capability to assimilate two subdaily time slices simultaneously, so assimilation windows longer than 6hrs will error out.
Individual observation "sigma" values are currently read, but not used. errstd from nml is used.
A fixed mask is read and applied with obs removed when any flags are set.
This mask is on the same 36km grid as the 36km resolution observations. If the observations are not on this grid it will error out.
For now, employs scale_obs_sfmc_zscore(), which uses scaling parameters on lat/lon grid in nc4 file (as in ASCAT_MET* species).