Global Precipitation Means and Variations with the

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Global Precipitation Means and Variations with the New Version of GPCP Robert Adler1, Guojun Gu1, George Huffman2, Ali Behrangi3, David Bolvin2, Jian-Jian Wang1, Eric Nelkin2 1U. of Maryland, 2NASAGoddard, 3U. of Arizona Global

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01
Global Precipitation Means and Variations with the New Version of GPCP
Robert Adler1, Guojun Gu1, George Huffman2, Ali Behrangi3, David Bolvin2, Jian-Jian Wang1, Eric Nelkin2
1U. of Maryland, 2NASA/Goddard, 3U. of Arizona Global Precipitation Climatology Project (GPCP) Monthly Product is an observational-based, blended analysis using satellite (over ocean and land) and gauge (over land) information GPCP analysis used in ~5000 journal papers GPCP V3 climatology
(1983-2020) Development of GPCP V3 sponsored by NASA MEaSUREs program<br>
02
Version 3.2 of the Global Precipitation Climatology Project (GPCP) Monthly Analysis (1983-2019) Key Features • Finer spatial resolution (0.5º latitude/longitude)
• Updated satellite algorithms, including GPROF applied to SSMI and SSMIS, but adjusted by V2 PMW algorithm (METH) for consistency
• Latest gauge analysis over land from the Global Precipitation Climatology Center (GPCC) in Germany
• Improved high-latitude analysis with improved satellite analysis and modified wind-loss gauge adjustments
• Fraction of frozen precipitation estimated from reanalysis surface temperature/moisture information (post-1992)
• Ocean estimates adjusted using climatologies from the Tropical Rainfall Measuring Mission (TRMM), the Global Precipitation Measurement (GPM) mission and CloudSat. “Old” GPCP V2.3 will continue (for a while) and is compared to V3.2 in this talk

V2 is part of NOAA’s Climate Data Record (CDR) program [Available from Goddard Disc]<br>
03
Version 3 Climatology compared to V2 Climatology (1983-2020) V3
New V2
Old V3-V2 • Small changes over land
• General increases over ocean with small decreases in drier zones
• Increases along ITCZ
• Increases in mid-latitude ocean maxima
• Decrease along 60S related to artifact in V2<br>