[特邀报告]Planetary and synoptic-scale dynamic control of extreme cold wave patterns over the United States

Planetary and synoptic-scale dynamic control of extreme cold wave patterns over the United States
编号:2343 稿件编号:2314 访问权限:私有 更新:2023-04-15 18:16:05 浏览:177次 特邀报告

报告开始:2023年05月08日 08:15 (Asia/Shanghai)

报告时间:15min

所在会议:[13C] 13C、大气物理与气象气候 » [13C-1] 13C-1 平流层-对流层大气耦合和物质交换及冰冻圈与大气相互作用

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摘要
Low Arctic sea ice extent favor the occurrence of extreme cold wave (ECW) events over the southeastern United States (US) via the Northern Hemisphere annular mode (NAM) negative phase. The roles of planetary and synoptic-scale waves in extreme cold wave (ECW) events over the southeastern US are studied using a spherical harmonic decomposition in conjunction with piecewise tendency diagnosis (PTD). Planetary waves and synoptic waves jointly work together to initiate ECW events. Notably, the planetary waves not only provide a direct contribution to circulation field enacting ECW events but also alter the background circulation field in such a manner that promotes synoptic waves growth via increases in regional barotropic deformation. The ECW events over the southeastern US, concurrent with the Northern Hemisphere annular mode (NAM) negative phase, feature high latitude intensification and subsequent southeastward movement of cold surface air temperature anomalies. The planetary-scale pattern provides a sizable contribution to the total wave pattern on both sea level pressure (SLP) and upper level. Moreover, the negative NAM planetary anomaly acts to displace the jet equatorward and thereby increases the barotropic deformation of the synoptic-scale anomaly over southeastern US. PTD confirms that the planetary-scale barotropic deformation plays a key role in deepening the negative height anomaly with a secondary contribution from baroclinic growth.
 
关键字
Sea ice,Extreme cold wave,Planetary wave,Barotropic deformation,Piecewise tendency diagnosis
报告人
谢作威
副研究员 中国科学院大气物理研究所

稿件作者
谢作威 中国科学院大气物理研究所
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徐 鹏(13554674258;xupengwhu@whu.edu.cn)
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李星华(15527964369;lixinghua5540@whu.edu.cn)
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