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The influence of the PDO on winter precipitation during high- and low-index ENSO conditions in the Eastern United States

Auteur(s) et Affiliation(s)

GOODRICH, G.B.
Dep. of geography and Geology Western Kentucky, Univ., Bowling Green, Etats-Unis
WALKER, J.M.
Dep. of geography and Geology Western Kentucky, Univ., Bowling Green, Etats-Unis


Description :
The AA. analyzed the influence of the PDO (Pacific Decadal Oscillation) on winter precipitation during years of high- and low-index ENSO conditions for 260 climate divisions in the eastern U.S. from 1925 to 1998. When the 33 neutral ENSO years are split by cold (12 years) and warm (21 years) PDO, the resulting winter precipitation patterns show wetter (drier) than average conditions in nearly all (80%) of the 260 climate divisions during the warm (cold) phase of the PDO. The two ENSO/PDO combinations with the driest signals for the eastern U.S. are La Niña/warm PDO and neutral ENSO/cold PDO. The modulation effect of the PDO is significant during La Niña in northern Texas and parts of New England and during neutral ENSO in southern Texas and the northern Plains. The AA. suggest that seasonal forecasters in these regions may use this knowledge to improve long-lead winter forecasts during those ENSO phases, assuming the current PDO phase is well established.


Type de document :
Article de périodique

Source :
Physical geography, issn : 0272-3646, 2011, vol. 32, n°. 4, p. 295-312, nombre de pages : 18, Références bibliographiques : 38 ref.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, Abingdon, Taylor and Francis

Langue :
Anglais
Droits :
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