Evaluation of Daily Precipitation Estimate from Integrated MultisatellitE Retrievals for GPM (IMERG) Data over South Korea and East Asia

동아시아 및 남한 지역에서의 Integrated MultisatellitE Retrievals for GPM (IMERG) 일강수량의 지상관측 검증

  • Lee, Juwon (Korea Institute of Atmospheric Prediction Systems) ;
  • Lee, Eun-Hee (Korea Institute of Atmospheric Prediction Systems)
  • 이주원 ((재)한국형수치예보모델개발사업단) ;
  • 이은희 ((재)한국형수치예보모델개발사업단)
  • Received : 2018.04.14
  • Accepted : 2018.06.25
  • Published : 2018.09.30


This paper evaluates daily precipitation products from Integrated Multisatellite Retrievals for Global Precipitation Measurement (IMERG), Tropical Rainfall Measuring Mission Multisatellite (TRMM) Precipitation Analysis (TMPA), and the Climate Prediction Center Morphing Method (CMORPH), validated against gauge observation over South Korea and gauge-based analysis data East Asia during one year from June 2014 to May 2015. It is found that the three products effectively capture the seasonal variation of mean precipitation with relatively good correlation from spring to fall. Among them, IMERG and TMPA show quite similar precipitation characteristics but overall underestimation is found from all precipitation products during winter compared with observation. IMERG shows reliably high performance in precipitation for all seasons, showing the most unbiased and accurate precipitation estimation. However, it is also noticed that IMERG reveals overestimated precipitation for heavier precipitation thresholds. This assessment work suggests the validity of the IMERG product for not only seasonal precipitation but also daily precipitation, which has the potential to be used as reference precipitation data.


Supported by : 기상청


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