HR: 1340h
AN: A13A-0905    [Abstracts]
TI: On the Definition of El Niño and Associated Seasonal Average U.S. and Global Weather Anomalies
AU: * Larkin, N
EM: larkin@fs.fed.us
AF: USDA Forest Service, 400 N. 34th St #201, Seattle, WA 98103 United States
AU: Harrison, D
EM: d.e.harrison@noaa.gov
AF: NOAA PMEL, 7600 Sand Point Way NE, Seattle, WA 98155 United States
AU: Harrison, D
EM: d.e.harrison@noaa.gov
AF: JISAO, University of Washington, Seattle, WA 98155 United States
AB: A new NOAA definition of El Niño identifies a number of additional El Niño seasons beyond those conventionally agreed. These additional seasons are characterized by SST anomalies primarily in the western central equatorial Pacific. We show here that the seasonal weather anomalies over associated with these additional "Dateline" El Niño seasons are substantially different from those associated with conventional El Niño seasons. Although some regions have similar associated anomalies, most of the major regional anomalies are quite different. Treating the two as a single phenomenon yields weaker overall seasonal weather associations and does not take advantage of the stronger associations available when the two are treated separately.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1620 Climate dynamics (0429, 3309)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005