南京大学学报(自然科学版) ›› 2024, Vol. 60 ›› Issue (2): 209217.doi: 10.13232/j.cnki.jnju.2024.02.003
• • 上一篇
艾真珍1,2, 董寅硕2, 徐昕1(), 季玉枝1, 衡志炜3
Zhenzhen Ai1,2, Yinshuo Dong2, Xin Xu1(), Yuzhi Ji1, Zhiwei Heng3
摘要:
针对2021年8月8日发生在四川盆地东北部的一次暴雨,利用地面观测和再分析资料,结合WRF (Weather Research and Forecasting)敏感性数值试验,研究了青藏高原东部地形对本次暴雨过程的影响和机理.结果表明,暴雨发生期间四川盆地主要受500 hPa高压脊影响,青藏高原东南侧绕流形成的西南气流向暴雨区输送暖湿空气,并在盆地形成低涡.高低空系统的耦合使得气流辐合抬升,为暴雨发生提供了良好条件.当青藏高原东部地形高度降低以后,地形对气流的阻挡作用减弱,原先高原东南侧绕流产生的西南气流减弱变为偏西气流.同时,高原东北侧的西北气流加强并南下,进一步减弱四川盆地的南风分量和水汽输送,最终导致水汽在四川盆地东南侧聚集和暴雨落区的南移.
中图分类号:
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