[口头报告]Dynamic pathway linking Pakistan flooding to East Asian heatwaves

Dynamic pathway linking Pakistan flooding to East Asian heatwaves
编号:1931 稿件编号:250 访问权限:仅限参会人 更新:2024-04-11 20:55:30 浏览:340次 口头报告

报告开始:2024年05月19日 14:50 (Asia/Shanghai)

报告时间:10min

所在会议:[S12] 主题12、大气物理与气象气候 » [S12-8] 主题12、大气物理与气象气候 专题12.10(19日下午,224)

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摘要
In July–August 2022, Pakistan suffered historic flooding while record-breaking heatwaves swept southern China, causing severe socio-economic impacts. Similar extreme events have frequently coincided between two regions during the past 44 years, but the underlying mechanisms remain unclear. Using observations and a suite of model experiments, here we show that the upper-tropospheric divergent wind induced by convective heating over Pakistan excites a barotropic anomalous anti-cyclone over eastern China, which further leads to persistent heatwaves. Atmospheric model ensemble simulation indicates that this dynamic pathway linking Pakistan flooding and East Asian heatwaves is intrinsic to the climate system, largely independent of global sea surface temperature forcing. This dynamic connection is most active during July–August when convective variability is large over Pakistan and the associated divergent flow excites barotropic Rossby waves that propagate eastward along the upper troposphere westerly waveguide. This robust waveguide and the time delay offer hopes for improved sub-seasonal prediction of extreme events in East Asia.
关键字
Extreme events,Heatwaves,Flooding,Dynamic pathway,Upper-level waveguide
报告人
傅正航
博士研究生 复旦大学

稿件作者
傅正航 复旦大学
周文 复旦大学
XieShang-Ping University of California San Diego
张如华 复旦大学
WangXudong 复旦大学
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