论文--中国科学院地理科学与资源研究所

论文

论文题目：	Variability in temperature extremes across the Tibetan Plateau and its non-uniform responses to different ENSO types
第一作者：	Yong Zhiwei, Wang Zegen, Xiong Junnan, Ye Chongchong etc.
联系作者：
发表年度：	2023
摘　　要：	Variability of extreme temperatures has an important influence on sensitive ecosystem and human activities on the Tibetan Plateau (TP). Nevertheless, the uncertainties of different El Nino-Southern Oscillation (ENSO) effects on extreme temperatures over the TP are poorly understood. Thus, this study focuses on variations in temperature extremes across the TP during 1980-2020 based on the daily maximum temperature and minimum temperature. We quantitatively examine the effects of different ENSO phases and related large-scale atmospheric circulation anomalies on the changes in temperature extremes according to different ENSO phases. The results show that the number of extreme cold events decreased significantly on the TP, while the number of extreme warm events increased significantly from 1980 to 2020. Moreover, our results suggest that the response of temperature extremes differs between the Eastern Pacific (EP) and Central Pacific (CP) ENSO. In particular, EP El Nino episodes result in more extreme cold events (r = 0.36, P < 0.01), whereas the influence of the CP El Nino episodes on the temperature extreme over the TP is weak. The correlation coefficients between the CP ENSO index and daily minimum temperature (daily maximum temperature) are 0.46 (0.49). In addition, the developing and decaying phases of ENSO had an essential influence on temperature extreme variability on the TP through the modulation of large-scale atmospheric circulation anomalies. Sea surface temperature during the different ENSO phases induced a Walker circulation anomaly in the tropical Pacific and ascending motion over the tropical Indian Ocean, which contributes to the generation of the anomalies of wind and geopotential height around the TP, inducing non-uniform responses of temperature extremes over the TP. In conclusion, ENSO is a critical factor that influences temperature extremes on the TP. This study provides some insight into understanding the dynamics of regional extreme temperatures during different ENSO episodes.
英文摘要：
刊物名称：	CLIMATIC CHANGE
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论文类别：	SCI