福建登陆减弱强台风降雨的基因诊断

IF 2.4 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Xiaohong Lin , Siyu Yin , Wei Wu , Mei Han , Tongyi Liu
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引用次数: 1

摘要

本研究利用上海台风研究所的台风资料、福建省降水资料和美国NCEP再分析资料,重点对最强12次 h暴雨进行基因诊断,采用动态综合分析方法,分析了一次西进台风登陆福建后暴雨减弱的原因。结果表明:(1)台风西进的环境场有利于沿海地区辐合的长期维持,为东南沿海暴雨增强提供天气尺度强迫;(2)边界层西南急流将低纬度暖水汽输送到台风东部环流;水汽峰值出现在最强暴雨前6 h,可作为预报强暴雨的参考指标;(3)高空强辐散中心位于100-150 hPa,强辐合中心位于边界层925-950 hPa附近,高于(低于)专业工作中常用的200 hPa辐散层(850 hPa辐合层);(4)边界层暖湿平流向南输送不稳定能量和弱冷空气,增强了斜压,增加了海面潜热通量,对东南沿海中尺度对流云的触发和发展起着重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Genetic diagnosis for heavy typhoon rainfall attenuated by Fujian landfall

This study used the dynamic synthetic analysis method to analyze the causes of attenuated heavy rainfall from a westward moving typhoon after landfall over Fujian by focusing on the genetic diagrgnosis of the strongest 12 h rainstorms based on typhoon data obtained from the Shanghai Typhoon Institute, precipitation data from Fujian Province, and NCEP reanalysis data from the United States. The results showed that: (1) the environmental field of the westward moving typhoon benefits the long-term maintenance of convergence in coastal areas, which provides synoptic scale forcing for rainstorm intensification along the southeastern coast; (2) the southwest jet in the boundary layer transports warm water vapor from low latitudes into the eastern circulation of typhoon; the water vapor peak occurs 6 h before the strongest rainstorm and can be used as a reference index to predict heavy rainstorms; (3) the high altitude strong divergence center is located at 100–150 hPa, and the strong convergence center is located near 925–950 hPa in the boundary layer, which is higher (lower) than the 200 hPa divergence layer (850 hPa convergence layer) commonly used in professional work; (4) warm and wet advection in the boundary layer transports unstable energy and weak cold air southward, strengthens the baroclinic pressure, increases the latent heat flux on the sea surface, and plays a significant role in triggering and developing mesoscale convective clouds along the southeast coast.

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来源期刊
Tropical Cyclone Research and Review
Tropical Cyclone Research and Review METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.60
自引率
3.40%
发文量
184
审稿时长
30 weeks
期刊介绍: Tropical Cyclone Research and Review is an international journal focusing on tropical cyclone monitoring, forecasting, and research as well as associated hydrological effects and disaster risk reduction. This journal is edited and published by the ESCAP/WMO Typhoon Committee (TC) and the Shanghai Typhoon Institute of the China Meteorology Administration (STI/CMA). Contributions from all tropical cyclone basins are welcome. Scope of the journal includes: • Reviews of tropical cyclones exhibiting unusual characteristics or behavior or resulting in disastrous impacts on Typhoon Committee Members and other regional WMO bodies • Advances in applied and basic tropical cyclone research or technology to improve tropical cyclone forecasts and warnings • Basic theoretical studies of tropical cyclones • Event reports, compelling images, and topic review reports of tropical cyclones • Impacts, risk assessments, and risk management techniques related to tropical cyclones
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