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August 16, 2026Journal of Geophysical Research Atmospheres

Assessing TROPICS SmallSat Precipitation for IMERG

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Authors

YMYayu MaUniversity of North Carolina WilmingtonYYYalei YouUniversity of North Carolina WilmingtonJRJihoon RyuUniversity of North Carolina Wilmington

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Implication

Comparative evaluation reveals reliable ocean precipitation retrievals from TROPICS smallsats, suggesting viable integration into global IMERG products despite land underestimation.

Key Points

  • Evaluate precipitation retrievals from the TROPICS smallsat constellation to assess suitability for integration into the Global Precipitation Measurement (GPM) IMERG product.
  • Evaluated Precipitation Retrieval and Profiling Scheme (PRPS) retrievals from four TROPICS Millimeter-wave Sounders (TMS) over ocean and land against the GPM radar-radiometer combined product (2BCMB).
  • Compared TMS retrieval performance against five operational GPM radiometers, including two cross-track scanning (ATMS, MHS) and three conical-scanning (GMI, AMSR2, SSMIS) sensors.
  • Over ocean, PRPS-TMS precipitation intensity correlated better with 2BCMB (correlation 0.52–0.56) than cross-track sensors ATMS (0.39) and MHS (0.38), but underperformed relative to conical-scanning sensors.
  • Over land, TMS underestimated heavy rainfall more than all evaluated GPM sensors except SSMIS, with retrieval accuracy degrading toward the swath edges.
  • Precipitation occurrence, intensity correlation, and bias remained consistent across all four TMS satellite sensors throughout the operational mission duration.

Cite This Study

Ma et al. (2026) studied this question.

synapsesocial.com/papers/6a8179bcf2fb91fc834ad010https://doi.org/10.1029/2026jd046970
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