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Interdecadal Variability of the Warm Arctic and Cold Eurasia Pattern and Its North Atlantic Origin

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Title
Interdecadal Variability of the Warm Arctic and Cold Eurasia Pattern and Its North Atlantic Origin
Other Titles
따뜻한 북극과 차가운 유라시아 패턴과 북대서양 기원의 간접적인 변동성
Authors
Sung, Mi-Kyung
Choi, Yong-Sang
Kim, Baek-Min
Kim, Seon-Hwa
Subject
Meteorology & Atmospheric Sciences
Keywords
Barents/Kara Seas; Warm Arctic and Cold Eurasia pattern; internal variability
Issue Date
2018-08
Citation
성미경, et al. 2018. "Interdecadal Variability of the Warm Arctic and Cold Eurasia Pattern and Its North Atlantic Origin". JOURNAL OF CLIMATE, 31(15): 5793-5810.
Abstract
This study investigates the origin of the interdecadal variability in the Warm Arctic and Cold Eurasia (WACE) pattern, which is defined as the second empirical orthogonal function of surface air temperature (SAT) variability over Eurasian continent in Northern winter, by analyzing the Twentieth Century Reanalysis dataset. While previous studies highlight recent enhancement of the WACE pattern ascribing it to anthropogenic warming, we found that the WACE pattern has experienced a seemingly periodic interdecadal variation over the twentieth century. This long-term variation in the Eurasian SAT is attributable to the altered coupling between the Siberian High (SH) and intraseasonal Rossby wave emanating from the North Atlantic, as the local wave branch interacts with the SH and consequentially enhances the continental temperature perturbation. It is further identified that these atmospheric circulation changes in Eurasia are largely controlled by the decadal amplitude modulation of the climatological stationary waves over the North Atlantic region. The altered decadal mean condition of stationary wave components brings changes in local baroclinicity and storm track activity over the North Atlantic, which jointly change the intraseasonal Rossby wave generation and propagation characteristics as well. With simple stationary wave model experiments, we confirm how the altered mean flow condition in North Atlantic acts as a source for the growth of the Rossby wave that leads to the change in the downstream WACE pattern.
URI
http://repository.kopri.re.kr/handle/201206/9523
DOI
http://dx.doi.org/10.1175/JCLI-D-17-0562.1
ISSN
0894-8755
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