[口头报告]Influences of tropical Pacific and North Atlantic SST anomalies on summer drought over Asia

Influences of tropical Pacific and North Atlantic SST anomalies on summer drought over Asia
编号:401 稿件编号:954 访问权限:仅限参会人 更新:2024-04-10 19:31:39 浏览:360次 口头报告

报告开始:2024年05月18日 17:55 (Asia/Shanghai)

报告时间:10min

所在会议:[S12] 主题12、大气物理与气象气候 » [S12-3] 主题12、大气物理与气象气候 专题12.5(18日下午,226)

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摘要
Present study investigates the characteristics and factors of summer drought variations over Asia during 1950-2020 using 3-month Standardized Precipitation Evapotranspiration Index (SPEI03) in July. The leading mode of Asian summer drought variations exhibits a roughly north-south contrasting distribution across 30°N with dominant interannual variability. The interannual variation of the leading mode is associated with both precipitation and temperature. In comparison, the contribution of precipitation is larger in the eastern part of the mid-latitude Asia. The Asian summer drought variations subject to both individual and combined impacts of preceding winter equatorial central-eastern Pacific (ECEP) sea surface temperature (SST) anomalies and concurrent North Atlantic (NA) tripole SST anomalies. Preceding ECEP SST anomalies induce anomalous vertical motion and precipitation over the mid-latitude Asia through large-scale divergence and convergence in previous winter and spring. The resulted soil moisture anomalies persist to summer and are conducive to anomalous summer precipitation through evaporation. The accompanying changes in cloud-radiation, surface longwave radiation and sensible heat flux induce temperature and evapotranspiration anomalies. The NA tripole SST anomalies induce anomalous vorticity forcing over the western mid-latitude NA. This contributes to a wave train that propagates from the NA to East Asia and affects wind and vertical motion over the mid-latitude Asia.
关键字
Asian summer drought; precipitation and temperature; SST anomalies; atmospheric wave train; soil moisture
报告人
张建敏
博士研究生 浙江大学地球科学学院

稿件作者
张建敏 浙江大学地球科学学院
吴仁广 浙江大学地球科学学院
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