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contributor authorWang, Fuyao
contributor authorLiu, Zhengyu
contributor authorNotaro, Michael
date accessioned2017-06-09T17:07:26Z
date available2017-06-09T17:07:26Z
date copyright2013/08/01
date issued2013
identifier issn0894-8755
identifier otherams-79738.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222551
description abstracthe seasonal impacts of the dominant sea surface temperature (SST) modes to North American climate are assessed comprehensively in observations using the multivariate generalized equilibrium feedback assessment (GEFA) method. The GEFA method is first validated before applying it to observations. Impacts of each individual SST mode are quantified and the associated mechanisms are discussed. Four critical SST modes for North American climate are found: the ENSO mode, Indian Ocean Basin (IOB) mode, North Pacific first empirical orthogonal function (EOF) mode, and tropical Atlantic second EOF mode. The impacts of the ENSO mode are consistent with previous studies qualitatively, while the impact strength is further quantified here. The IOB mode has a strong influence on surface air temperature across North America, and it is demonstrated for the first time that its impact strength might even exceed that of ENSO during both winter and summer. The IOB mode also affects the year-round precipitation. A deeper understanding of the impact of North Pacific SSTs on wintertime surface air temperature is achieved: namely, positive SST anomalies in the Kuroshio Extension region correspond to colder (warmer) air in western (eastern) North America. The tropical Atlantic has a more significant influence on North American precipitation than does the extratropical Atlantic, with colder than normal tropical North Atlantic SSTs supporting wetter conditions across much of the United States, especially during autumn. Because of the linearity of GEFA, the total impacts of multiple SST modes can be obtained by the linear combination of each individual mode's impact. The GEFA method is a potentially powerful tool for seasonal climate prediction.
publisherAmerican Meteorological Society
titleExtracting the Dominant SST Modes Impacting North America's Observed Climate
typeJournal Paper
journal volume26
journal issue15
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-12-00583.1
journal fristpage5434
journal lastpage5452
treeJournal of Climate:;2013:;volume( 026 ):;issue: 015
contenttypeFulltext


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