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Arctic Oscillation and the autumn/winter snow depth over the Tibetan Plateau

Cited 10 time in scopus
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Title
Arctic Oscillation and the autumn/winter snow depth over the Tibetan Plateau
Other Titles
북극진동과 가을/겨울철 테벳고원의 눈의 양과의 관계연구
Authors
Junmei Lu
Jian-Hua Ju
Yu-Xiang Zhu
Ju-Zhang Ren
Kim, Seong-Joong
Subject
Meteorology & Atmospheric Sciences
Keywords
Arctic Oscillation; Climate; Rossyby Waves; Snow Depth; Tibetan Plateau
Issue Date
2008
Publisher
American Geophysical Union
Citation
Junmei Lu, et al. 2008. "Arctic Oscillation and the autumn/winter snow depth over the Tibetan Plateau". JOURNAL OF GEOPHYSICAL RESEARCH, 13(D14): 1-9.
Abstract
The present study examines the relationship between the Arctic Oscillation (AO) and the autumn/winter snow depth over the Tibetan Plateau. Results show that there exists significant correlation between the AO and the Tibetan Plateau snow depth on interdecadal time scale. The AO and the snow depth over the Tibetan Plateau experienced interdecadal regime shift in the late 1970’s. Before the late 1970’s when the AO was in its interdecadal negative phase, the snow depth over the Tibetan Plateau increased in fall, and then decreased in following winter. On the contrary, when the AO has entered its interdecadal positive phase since the early 1980’s, the snow depth decreased in fall, but increased in winter. The vertical propagation of Rossby waves is proposed to explain the physical process linking the AO with the snow depth. Anomalously excessive fall snow depth over the Tibetan Plateau amplifies orographically forced upward stationary waves. The snow-forced changes in stratosphere are not identified until later in the winter season when Rossby waves propagate into the stratosphere and the AO becomes negative. In winter, when the troposphere and stratosphere are actively coupled, the downward propagation of Rossby waves associated with the positive AO phase modulates the atmospheric circulation in the troposphere, and causes the abnormal increase of snow depth over the Tibetan Plateau.
URI
http://repository.kopri.re.kr/handle/201206/6341
DOI
http://dx.doi.org/10.1029/2007JD009567
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