灾害学2016，Vol.31Issue(3)：84-90,7.DOI:10.3969/j.issn.1000-811X.2016.03.014
2014年2号热带低压导致福建闽西北灾害成因分析
Analysis of the Causes of Geological Disaster in Northwestern Fujian Province Induced by No.2 Tropical Depression of 2014
摘要
Abstract
In August,2014,No.2 tropical depression (TD2)moves northward after landing in Xiapu Coun-ty,Fujian Province.It results in an extremely heavy rainstorm in northwestern Fujian Province and the related flood and geological disasters.These disasters affect nearly 100,000 people with 4 people dead,and cause an economic loss of 250 million RMB.Great discrepancies in terms of the intensity and location of this rainstorm are found a-mong different numerical prediction models (NWPs).To analyze this extremely heavy rainstorm process,various data including automatic meteorological station,radar products,and routine weather map are used.It is shown that this rainstorm is attributed to the interactions between northward-movement TD2 arising from the South China Sea and cold air from high latitudes.The rainstorm originates from this type of weather background:eastward migration of high-level trough,wind shear in middle-low levels,southward movements of cold front,and northward move-ments of TD2 in the South China Sea.After landing in Fujian,the maintenance of TD2 intensity is due to the incor-porations of the moist baroclinic frontal zone related to the cold air,positive vorticity area near the wind shear in middle-low levels,and high divergence area before high-level trough and to the right of the southwesterly jet. Northward-movement TD2 provides a great amount of water vapor with high energy and high temperature.Through interacting with the cold air,unstable condition and ascending motion intensify,which further triggers the convec-tion.Since the cloud clusters of the TD2 and the westerly trough merge in Northwestern Fujian Province,a more powerful cloud cluster is formed.The location of the extremely heavy rainstorm is in good accordance with the area of moist baroclinic front,convective unstable zone,overlapping area of positive moist potential vorticity in high lev-el and negative moist potential vorticity in low level,and ascending motion zone.关键词
热带低压/冷空气/大暴雨/灾害/湿斜压锋区/对流不稳定/福建闽西北Key words
tropical depression/cold air/extremely heavy rainstorm/disaster/moist baroclinic frontal zone/convective instability/northwestern Fujian Province分类
环境科学引用本文复制引用
陈敏艳,刘爱鸣,陈秋萍..2014年2号热带低压导致福建闽西北灾害成因分析[J].灾害学,2016,31(3):84-90,7.基金项目
福建省自然科学基金 （）
