NDLI: Global precipitation variations and long-term changes derived from the gpcp monthly product

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Global precipitation variations and long-term changes derived from the gpcp monthly product

Content Provider	NASA Technical Reports Server (NTRS)
Author	Huffman, George Adler, Robert F. Gu, Guojun Curtis, Scott
Copyright Year	2005
Description	Global and large regional rainfall variations and possible long-term changes are examined using the 25-year (1979-2004) monthly dataset from the Global Precipitation Climatology Project (GPCP). The emphasis is to discriminate among the variations due to ENSO, volcanic events and possible long-term changes. Although the global change of precipitation in the data set is near zero, the data set does indicate an upward trend (0.13 mm/day/25yr) and a downward trend (-0.06 mm/day/25yr) over tropical oceans and lands (25S-25N), respectively. This corresponds to a 4% increase (ocean) and 2% decrease (land) during this time period. Techniques are applied to attempt to eliminate variations due to ENSO and major volcanic eruptions. The impact of the two major volcanic eruptions over the past 25 years is estimated to be about a 5% reduction in tropical rainfall. The modified data set (with ENSO and volcano effect removed) retains the same approximate change slopes, but with reduced variance leading to significance tests with results in the 90-95% range. Inter-comparisons between the GPCP, SSWI (1988-2004), and TRMM (1998-2004) rainfall products are made to increase or decrease confidence in the changes seen in the GPCP analysis.
File Size	54651
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20050243326
Archival Resource Key	ark:/13960/t4rj9dp2j
Language	English
Publisher Date	2005-01-01
Access Restriction	Open
Subject Keyword	Meteorology And Climatology Climatology Southern Oscillation Estimating Trmm Satellite El Nino Volcanoes Precipitation Meteorology Statistical Tests Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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