Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 46, Issue 22, Pages 13584-13592Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL085395
Keywords
Global Precipitation Measurement; rainfall; snowfall; satellite precipitation; variability; remote sensing
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Funding
- NASA [NNH18ZDA001N-PMMST]
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This study demonstrates the maturing ability of the half-hourly precipitation estimates from the Integrated Multi-satellitE Retrievals for GPM (IMERG) for use in global analyses of the diurnal cycle. The refined intercalibration and interpolation between the sensors in V06 leads to greater consistency in the precipitation retrievals over different hours of the day. Evaluation against ground measurements suggests a slight lag in the diurnal phase of only +0.59 hr. We demonstrate the diurnal cycle over different regions around the globe, including the Maritime Continent, where accurate representation of precipitation variability in global models remains a challenge. Using examples over Singapore, Bangladesh, and Lake Victoria, we reveal the intricate interplay between diurnal and seasonal variability. This study demonstrates the unprecedented capability of IMERG in capturing the diurnal cycle of precipitation globally, potentially advancing our understanding in regions of sparse ground measurements and supporting improvements in its representation in global models.
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