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Description
This is the last version of the TRMM-formatted, in HDF4 format, Combined (Radar-Radiometer) product, which is in a state of permanent preservation. New version that is consistently processed with Global precipitation Measurement (GPM) algorithms, and in a concistent with GPM HDF5 format, is available under short name GPM_3CMB_TRMM. Note that new TRMM Daily Combined product has now been made available: GPM_3CMB_TRMM_DAY.
The dataset TRMM_3B31 uses the high quality retrievals done for the narrow swath in 2B31 to calibrate the wide swath retrievals generated in 2A12. For each 0.5 degree box and each vertical layer, an adjustment ratio is calculated for the swath overlap region for one month. Only TMI pixels with 2A12 pixelStatus equal to zero are included in monthly averages, which effectively removes sea ice.
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C1282032614-GES_DISC
Data State
COMPLETE
Number of Files/Granules
205
Processing Level
3
Published
Updated
Science Keywords
Cloud Liquid Water/Ice
,
Precipitation Amount
,
Rain
Citation
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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MENEGHINI, R. O. B. E. R. T. (2011). TRMM TMI/PR Combined Precipitation L3 1 month 0.5 degree x 0.5 degree V7 (TRMM_3B31) at GES DISC [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/6D9G45TPT6A6 Date Accessed: 2026-05-19
MENEGHINI, ROBERT. “TRMM TMI/PR Combined Precipitation L3 1 Month 0.5 Degree x 0.5 Degree V7 (TRMM_3B31) at GES DISC.” NASA Goddard Earth Sciences Data and Information Services Center, 2011. doi:10.5067/6D9G45TPT6A6. Date Accessed: 2026-05-19
MENEGHINI, R. OB ER T. TRMM TMI/PR Combined Precipitation L3 1 Month 0.5 Degree x 0.5 Degree V7 (TRMM_3B31) at GES DISC. NASA Goddard Earth Sciences Data and Information Services Center, 2011, doi:10.5067/6D9G45TPT6A6. Date Accessed: 2026-05-19