Liquid Water Path (LWP) Retrievals from Reprocessed S-NPP ATMS Through Remapping

The Advanced Technology Microwave Sounder (ATMS) onboard the Suomi-National Polar-orbiting Partnership (S-NPP) is a cross-track scanning instrument with frequencies ranging from 23 to 183 GHz which allows for probing the atmospheric temperature and moisture. Reprocessed S-NPP ATMS data produced by NOAA/STAR provides consistent high quality data by optimizing algorithms and processing systems. In this study, measurements at 23.8 and 31.4 GHz from reprocessed S-NPP ATMS data are used to retrieve the liquid water path (LWP) in the atmosphere over ocean surfaces. In order to connect with AMSU-A retrieved LWPs, those two ATMS channels are remapped to AMSU-A beam width of 3.3° from their original 5.2° beam width. It’s found that LWP retrieved from remapped ATMS is larger than that from original ATMS, and more consistent with LWPs retrieved from AMSU-A onboard NOAA and MetOp satellites. Moreover, diurnal cycle of LWP can be identified among those NOAA and MetOp satellites.

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