The SMAP Level 4 data sets, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC), were reprocessed from 1 Nov 2023 through the present after an issue was discovered with the IMERG-Late precipitation input after the GPM orbit boost on 7-8 November 2023. The reprocessed data files have the SVID (science version ID) Vv7031 (the L4 SM products) and Vv7041 (the L4 carbon product) and now use the NOAA Climate Prediction Center "Unified" (CPCU) precipitation inputs instead of IMERG-Late precipitation inputs. Data from the older versions (Vv7030 and Vv7040) from 1 Nov 2023 through the present is considered bad; users are strongly encouraged to download the newer files.
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Analysis Update, Version 7
Data set DOI: https://doi.org/10.5067/LWJ6TF5SZRG3
SMAP L4 Global 3-hourly 9 km EASE-Grid Surface and Root Zone Soil Moisture Geophysical Data, Version 6
Data set DOI: https://doi.org/10.5067/EVKPQZ4AFC4D
SMAP L4 Global 9 km EASE-Grid Surface and Root Zone Soil Moisture Land Model Constants, Version 7
Data set DOI: https://doi.org/10.5067/KN96XNPZM4EG
SMAP L4 Global Daily 9 km EASE-Grid Carbon Net Ecosystem Exchange, Version 7
Data set DOI: https://doi.org/10.5067/3K9F0S1Q5J2U