Severe extreme cold event in Beijing-Tianjin-Hebei region tied to mid–high-latitude intraseasonal waves
编号：460
稿件编号：146 访问权限：仅限参会人
更新：2025-03-29 10:12:06 浏览：99次
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报告开始：2025年04月19日 17:30 （Asia/Shanghai）
报告时间：10min
所在会议：[S1-11] 专题1.11 极端气候事件的形成机理与预测技术 » [S1-11] 专题1.11 极端气候事件的形成机理与预测技术
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摘要
Plain Language Summary
In February 2022, an extreme cold event affected the Beijing-Tianjin-Hebei (BTH) region during the Winter Olympics, posing significant challenges to public health and economic activities. This study investigates the main subseasonal atmospheric conditions that caused this extreme cold spell by observational diagnostics and subseasonal prediction analyses. Two propagating quasi-biweekly oscillations (QBWO) contributed to the development of the event by generating and enhancing a low-level cyclonic anomaly, which created favorable conditions for cold air accumulation over BTH. The fidelity of the dynamic model to the mid–high-latitude QBWO signals determines the accuracy of the subseasonal prediction of such cold events.
In February 2022, an extreme cold event affected the Beijing-Tianjin-Hebei (BTH) region during the Winter Olympics, posing significant challenges to public health and economic activities. This study investigates the main subseasonal atmospheric conditions that caused this extreme cold spell by observational diagnostics and subseasonal prediction analyses. Two propagating quasi-biweekly oscillations (QBWO) contributed to the development of the event by generating and enhancing a low-level cyclonic anomaly, which created favorable conditions for cold air accumulation over BTH. The fidelity of the dynamic model to the mid–high-latitude QBWO signals determines the accuracy of the subseasonal prediction of such cold events.
关键字
Extreme cold wave,subseasonal prediction,intraseasonal variability
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