[口头报告]极涡前期条件对平流层最后增温事件形成的影响

极涡前期条件对平流层最后增温事件形成的影响
编号:1380 稿件编号:364 访问权限:仅限参会人 更新:2024-04-11 15:51:15 浏览:327次 口头报告

报告开始:2024年05月19日 16:02 (Asia/Shanghai)

报告时间:12min

所在会议:[S12] 主题12、大气物理与气象气候 » [S12-7] 主题12、大气物理与气象气候 专题12.8(19日下午,222)

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摘要
Stratospheric Final Warmings (SFWs) are considered to have a distinct impact on the surface weather and stratospheric ozone. Most SFWs are predominantly wave-driven, while previous studies generally focused on the effects of tropospheric anomalous wave forcing on stratospheric wave amplification. This study demonstrates the crucial role of preconditioned stratospheric modulation on the occurrence of wave-driven SFWs in the Northern Hemisphere, using ERA5 reanalysis. In most cases, the preconditioned stratospheric state is the key factor in determining the occurrence of both early and late SFWs. The tropospheric anomalous wave forcing cannot independently trigger most SFWs without stratospheric modulation. The proportion of anomalous stratospheric signals followed by SFWs is much higher than that of anomalous tropospheric forcing, even if the proportions of SFWs preceded by anomalous stratospheric signals and tropospheric wave forcing are similar. Additionally, about 25% of SFWs are only preceded by stratospheric modulation without anomalously strong tropospheric wave amplification.
关键字
平流层极涡,平流层最后增温
报告人
杨鹏坤
博士研究生 南京大学大气科学学院

稿件作者
杨鹏坤 南京大学大气科学学院
鲍名 南京大学
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