摘要
利用自动站、卫星云图、探空等常规和非常规资料,对2010年8月8日凌晨造成舟曲特大泥石流的短时强降水天气过程的天气背景、形成机理、物理成因、卫星云图特征进行了较为深入细致的研究。结果表明,自动站气象要素变化能反映中小尺度天气系统的信息;卫星云图上,东移锋面云系尾部在顺时针旋转的南亚高压东部激发起对流云团,对流云团在有利的温湿条件、不稳定的层结、较大的高空风垂直切变下,迅速发展、合并成中α对流系统,在其前进方向右后方边缘亮温梯度大的地方出现短时强降水;副高边缘的高能水汽输送带使甘肃南部具备对流发展的潜势,500 hPa小槽、200 hPa辐散区、地面冷锋的配合,激发中尺度对流系统(MCS),使其得以发展;有利的层结条件和高空风垂直切变使MCS得以加强,最终造成舟曲短时局地强降水,并引发特大山洪泥石流。
By using the data of automatic weather stations,satellite images,sounding,etc,the short-term strong rainfall weather process were analyzed which cause a large debris flow at Zhouqu of Gansu Province on Aug.8,2010.The results showed that meteorological elements of the automatic station changes can reflect the small and medium scale weather system.A tail of frontal cloud into the east of South Asia high stimulates the convective clouds,the humid conditions,unstable stratification and the larger upper wind vertical shear,made cloud cluster in rapid development and merge into the MαCS,in the direction of the right rear edge temperature gradient of the place appear short-term strong precipitation.The edge of the subtropical high vapour conveyor belt make south Gansu have convection development potential,500 hPa small groove,200 hPa divergence,ground front,stimulate mesoscale convective system（MCS）,make it to development.Favorable stratification conditions and high altitude wind vertical shear make MCS to strengthen,resulting short local strong rainfall at Zhouqu,and trigger large flash flood debris flow.
出处
《安徽农业科学》
CAS
2013年第12期5448-5452,共5页
Journal of Anhui Agricultural Sciences
基金
甘肃省气象局重点项目(2011_03)
中国气象局关键技术项目(CMAGJ2013Z09)
中国气象局行业专项(GYHY201206029)
关键词
强对流
特大泥石流
天气背景
舟曲
Strong convection
Large debris flow
Weather background
Zhouqu
