Arctic-North Pacific coupled impacts on the late autumn cold in North America
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- Arctic-North Pacific coupled impacts on the late autumn cold in North America
- Other Titles
- 북극-북태평양 상호작용이 북미 지역 늦가을 한파에 미치는 영향
- Sung, Mi-Kyung
- Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
- PDO; 북극; 한파
- Issue Date
- Sung, Mi-Kyung, et al. 2016. "Arctic-North Pacific coupled impacts on the late autumn cold in North America". ENVIRONMENTAL RESEARCH LETTERS, 11(8): 1-8.
- 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 thePDOand the warm Arctic. This observational finding is supported by two independent modeling experiments: (1) an idealized coupledGCMexperiment 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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