Summertime atmospheric teleconnection pattern associated with a warming over the eastern Tibetan Plateau |
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| Authors: | Weijun Zhu Yongsheng Zhang |
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| Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education,
Nanjing University of Information Science and Technology, Nanjing 210044;
International Pacific Research Center, University of Hawaii at Manoa, Honolulu 96822, USA;International Pacific Research Center, University of Hawaii at Manoa, Honolulu 96822, USA |
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| Abstract: | By using a surface air temperature index (SATI) averaged over the eastern Tibetan Plateau (TP),
investigation is conducted on the short-term climate variation associated with the interannual air warming
(or cooling) over the TP in each summer month. Evidence suggests that the SATI is associated with a consistent
teleconnection pattern extending from the TP to central-western Asia and southeastern Europe. Associated
rainfall changes include, for a warming case, a drought in northern India in May and June, and a stronger
mei-yu front in June. The latter is due to an intensified upper-level northeasterly in eastern China and
a wetter and warmer condition over the eastern TP. In the East Asian regions, the time-space distributions
of the correlation patterns between SATI and rainfall are more complex and exhibit large differences from
month to month. Some studies have revealed a close relationship between the anomalous heating over the TP
and the rainfall anomaly along the Yangtze River valley appearing in the summer on a seasonal mean time-scale,
whereas in the present study, this relationship only appears in June and the signal's significance becomes
weaker after the long-term trend in the data was excluded. Close correlations between SATI and the convection
activity and SST also occur in the western Pacific in July and August: A zonally-elongated warm tone in the
SST in the northwestern Pacific seems to be a passive response of the associated circulation related to a
warm SATI. The SATI-associated teleconnection pattern provides a scenario consistently linking the broad
summer rainfall anomalies in Europe, central-western Asia, India, and East Asia. |
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| Keywords: | teleconnection pattern short-term climate variation Tibetan Plateau surface air temperature |
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