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Record 1 of 7046
The Evolution of Tropical Precipitation Patterns During ENSO Events Using 21+ Years of GPCP Merged Data
Author and Affiliation:
Curtis, Scott(Maryland Univ., Joint Center for Earth Systems Technology, Greenbelt, MD United States)
Adler, Robert(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Abstract: The ENSO phenomenon is characterized by fluctuations in the climate system of the tropical Pacific. Quantifying changes in the precipitation component of this system is important in understanding the distribution of heating in the atmosphere which drives the large-scale circulation and affects the weather patterns in the mid-latitudes. Monitoring precipitation anomalies in the Pacific is also an important component for tracking the evolution of ENSO. The most timely and complete observations of the earth come from satellite instruments. In this study, the state of the art satellite-gauge merged monthly precipitation data set from the Global Precipitation Climatology Project (GPCP) is used to depict tropical rainfall patterns during ENSO events over the past two decades and quantify these patterns using indices. This analysis will be complemented by daily precipitation data which can resolve the Madden-Julian Oscillation and westerly wind burst events. The 1997-98 El Nino and 1998-2000 La Nina were the best observed ENSO cycle in the historic record. Prior to the El Nino (in terms of anomalous warming of the east Pacific) dry anomalies over the Maritime Continent were observed in February 1997 as a westerly wind burst advected convection to the east. The largest SST anomalies occurred around November-December 1997, which were followed by the largest precipitation anomalies in the beginning of 1998. The largest precipitation departures from normal were not colocated with the SST anomalies, but were further west, In the spring of 1998 negative precipitation anomalies to the north of the equator intensified, signaling the mature phase of the El Nino. A rapid increase in the precipitation-based La Nina index from December-January 1998 to March-April 1998 signaled the coming La Nina. The 1982-1983 El Nino was comparable in strength (according to several indices) and the precipitation patterns evolved in a similar fashion. For the 1998-2000 La Nina, the coldest anomalies, were confined to the central equatorial Pacific, while the driest anomalies were found in the west Pacific,
Publication Date: Jan 01, 2000
Document ID:
20000090520
(Acquired Sep 22, 2000)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Document Type: Preprint
Meeting Information: 30 May - 3 Jun. 2000; Washington, DC; United States
Meeting Sponsor: American Geophysical Union; Washington, DC United States
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: CLIMATOLOGY; EL NINO; PACIFIC OCEAN; PRECIPITATION (METEOROLOGY); SOUTHERN OSCILLATION; TROPICAL METEOROLOGY; SATELLITE INSTRUMENTS; TROPICAL REGIONS
Availability Source: Other Sources
Availability Notes: Abstract Only
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