[特邀报告]Drying tendency over the southern slope of the Tibetan Plateau in recent decades

Drying tendency over the southern slope of the Tibetan Plateau in recent decades
编号:2524 稿件编号:1316 访问权限:私有 更新:2023-04-11 20:43:39 浏览:294次 特邀报告

报告开始:2023年05月07日 10:00 (Asia/Shanghai)

报告时间:15min

所在会议:[13A] 13A、大气物理与气象气候 » [13A-2] 13A-2 区域气候变化动力学

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摘要
A significant drying tendency over the southern slope of the Tibetan Plateau (SSTP) in summer (especially in July–September) during 1980–2018 is identified in this study. Moisture budget analysis reveals that the drying tendency is dominated by a decreased vertical moisture advection due to weakened upward motion, which is mainly resulted from an anticyclonic trend appeared over the northeastern TP. This anomalous anticyclone can weaken the upper-tropospheric divergence pumping over the SSTP. In addition, moist static energy diagnosis indicates that the southern branch of the anomalous anticyclone advects low moist enthalpy air into the SSTP, which also suppresses local upward motion and convection. Moreover, the anticyclonic trend over the northeastern TP is found not a local phenomenon, but is rather associated with the large-scale atmospheric change in the middle latitudes that shows a circumglobal teleconnection (CGT)-like pattern. Our results highlight that the long-term CGT-like trend of atmospheric circulation plays a crucial role in triggering the drying tendency over the SSTP in recent decades. 
关键字
Drying trend,Tibetan Plateau,Mid-latitude atmospheric changes
报告人
王子谦
中山大学

稿件作者
王子谦 中山大学
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