Arctic-North Pacific coupled impacts on the late autumn cold in North America

The Pacific decadal oscillation (PDO) is known to bring an anomalously cold (warm) period to southeastern (northwestern) North America during the cold season of its positive phase through a Rossby wave linkage. This study provides evidence that the remote connection between the North Pacific and the...

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Bibliographic Details
Published in:Environmental Research Letters
Main Authors: Mi-Kyung Sung, Baek-Min Kim, Eun-Hyuk Baek, Young-Kwon Lim, Seong-Joong Kim
Format: Article in Journal/Newspaper
Language:English
Published: IOP Publishing 2016
Subjects:
Pacific decadal oscillation
arctic warming
Arctic–midlatitude interaction
Environmental technology. Sanitary engineering
TD1-1066
Environmental sciences
GE1-350
Science
Q
Physics
QC1-999
Arctic
East Siberian Sea
Pacific
Chukchi
Online Access:https://doi.org/10.1088/1748-9326/11/8/084016
https://doaj.org/article/689b86c4c65c4bcfaf0d31d301fe4ff1
Description
Summary:The Pacific decadal oscillation (PDO) is known to bring an anomalously cold (warm) period to southeastern (northwestern) North America during the cold season of its positive phase through a Rossby wave linkage. This study provides evidence that the remote connection between the North Pacific and the downstream temperature over central North America is strengthened by the warm arctic conditions over the Chukchi and East Siberian Sea, especially in the late autumn season. The modulation effect of the Arctic manifests itself as an altered Rossby wave response to a transient vorticity forcing that results from an equatorward storm track shift, which is induced collaboratively by the PDO and the warm Arctic. This observational finding is supported by two independent modeling experiments: (1) an idealized coupled GCM experiment being nudged toward the warm arctic surface condition and (2) a simple stationary wave model experiment forced by transient eddy forcing.

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