Early assessment of Integrated Multi-satellite Retrievals for Global Precipitation Measurement over China

Hao Guo, Sheng Chen, Anming Bao, Ali Behrangi, Yang Hong, Felix Ndayisaba, Junjun Hu, Phillip M. Stepanian

Research output: Contribution to journalArticlepeer-review

145 Scopus citations

Abstract

Two post-real time precipitation products from the Integrated Multi-satellite Retrievals for Global Precipitation Measurement Mission (IMERG) are systematically evaluated over China with China daily Precipitation Analysis Product (CPAP) as reference. The IMERG products include the gauge-corrected IMERG product (IMERG_Cal) and the version of IMERG without direct gauge correction (IMERG_Uncal). The post-research TRMM Multisatellite Precipitation Analysis version 7 (TMPA-3B42V7) is also evaluated concurrently with IMERG for better perspective. In order to be consistent with CPAP, the evaluation and comparison of selected products are performed at 0.25° and daily resolutions from 12 March 2014 through 28 February 2015.The results show that: Both IMERG and 3B42V7 show similar performances. Compared to IMERG_Uncal, IMERG_Cal shows significant improvement in overall and conditional bias and in the correlation coefficient. Both IMERG_Cal and IMERG_Uncal perform relatively poor in winter and over-detect slight precipitation events in northwestern China. As an early validation of the GPM-era IMERG products that inherit the TRMM-era global satellite precipitation products, these findings will provide useful feedbacks and insights for algorithm developers and data users over China and beyond.

Original languageEnglish (US)
Pages (from-to)121-133
Number of pages13
JournalAtmospheric Research
Volume176-177
DOIs
StatePublished - Jul 1 2016
Externally publishedYes

Keywords

  • Global Precipitation Measurement
  • Precipitation
  • Remote sensing
  • Satellite

ASJC Scopus subject areas

  • Atmospheric Science

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