期刊
ADVANCES IN ATMOSPHERIC SCIENCES
卷 27, 期 4, 页码 788-794出版社
SCIENCE PRESS
DOI: 10.1007/s00376-009-9071-x
关键词
Tibetan Plateau; snow depth; North Atlantic Oscillation (NAO); tropospheric cooling
资金
- R&D Special Fund for Public Welfare Industry (meteorology) [GYHY200706010, GYHY200806020]
- National Science Foundation of China [40625014, 40821092]
- National Key Project of Scientific and Technical Supporting Programs [2007BAC03A01, 2007BAC29B03]
The authors present evidence to suggest that variations in the snow depth over the Tibetan Plateau (TP) are connected with changes of North Atlantic Oscillation (NAO) in winter (JFM). During the positive phase of NAO, the Asian subtropical westerly jet intensifies and the India-Myanmar trough deepens. Both of these processes enhance ascending motion over the TP. The intensified upward motion, together with strengthened southerlies upstream of the India-Myanmar trough, favors stronger snowfall over the TP, which is associated with East Asian tropospheric cooling in the subsequent late spring (April-May). Hence, the decadal increase of winter snow depth over the TP after the late 1970s is proposed to be an indicator of the connection between the enhanced winter NAO and late spring tropospheric cooling over East Asia.
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