气象2017，Vol.43Issue(5)：528-539,12.DOI:10.7519/j.issn.1000-0526.2017.05.002
“16·7”华北极端强降水特征及天气学成因分析
Characteristics and Synoptic Mechanism of the July 2016 Extreme Precipitation Event in North China
摘要
Abstract
An extremely severe precipitation event took place in North China in 19-20 July 2016.It was characterized by large rainfall,persistent rainfall,warm cloud rainfall,strong local rainfall intensity and orographic precipitation.Its rainfall was larger than that of the extreme rainfall in 3-5 August 1996,and only next to the amount of the 2-7 August 1963 extreme rainfall event.It occurred under the circulation background of the South Asia high moving eastward,the West Pacific subtropical high moving northwestward and the low vortex in the westerlies developing in mid-high latitude.The abnormal development of Huanghuai cyclone,southwest and southeast low-level jets,and the abnormally abundant moisture indicates that the dynamic lifting and moisture conditions favored this severe rainfall process significantly.The whole rainfall event presented clearly the phase characteristics,and could be divided into two stages.The first stage was the orographic rainfall caused by the easterly winds ahead of the trough from the early morning to the daytime of 19 July,while the second part was produced by spiral rain bands in the north side of Huanghuai cyclone from the night of 19 to the daytime of 20 July.In the first stage,the easterly low-level jet was lifted by the Taihang Mountains,which continuously triggered the convective cells along the east edge of the mountains.The weak dry and cold advection at mid-level and the strong warm and wet advection at low-level jointly maintained the convective instability.The cold pool generated by heavy rainfall and the mesoscale frontogenesis process created by local orographic effect provided favorable conditions for severe convections to occur continuously.The second stage rainfall was mainly related to the development of cut-off vortex and Huanghuai cyclone.The blocking of the high pressure system slowed the steps of Huanghuai cyclone in North China,thus leading to the long-lasting rainfall process.关键词
极端降水事件/切断低涡/异常发展/移动缓慢/地形增幅Key words
extreme precipitation event/cut-off low vortex/abnormal development/slow-moving/orographic effect on precipitation分类
天文与地球科学引用本文复制引用
符娇兰,马学款,陈涛,张芳,张夕迪,孙军,权婉晴,杨舒楠,沈晓琳..“16·7”华北极端强降水特征及天气学成因分析[J].气象,2017,43(5):528-539,12.基金项目
中国气象局预报员专项(CMAYBY2016-086)、国家自然科学基金项目(41105030)和预报预测核心业务发展专项(CMAHX20160101)共同资助 （CMAYBY2016-086）
