摘要
利用FNL再分析、常规资料、区域自动站、FY-2G资料,对新疆东部2018年7月31日出现的区域极端暴雨环境场特征进行分析,并与新疆暴雨研究成果及中国南方进行对比。结果表明:此次极端暴雨是在稳定的两脊一槽大尺度环流背景下,由高架对流造成;暴雨落区位于高空西南急流入口区右侧,500 hPa中亚低涡前西南气流与西太平洋副热带高压(下称西太副高)西侧偏南气流汇合区域,700 hPa东南低空急流出口区前部辐合区及地面上冷锋后部负变温区的重叠区域;500 hPa中亚低涡、700 hPa低空急流及其前部辐合区、800~600 hPa强锋区触发了高架对流;对流层低层700 hPa附近强辐合与高层强辐散,为高架对流的发展提供了动力触发条件,从而使中亚低涡前西南暖湿气流及来自阿拉伯海、孟加拉湾、南海和西太平洋的水汽绕过和翻越青藏高原迅速在暴雨区辐合集中,并不断被抬升至高空,为极端暴雨的产生提供了充足的水汽条件。此次区域极端暴雨与新疆其他地区暴雨存在较大差异;与中国南方高架对流也存在明显的差异。
By using FNL reanalysis data,the routine observation data,the regional automatic station data,FY-2G data,Analysis of extreme rainstorm environmental field characteristics in eastern Xinjiang on July 31,2018,and compared with the research results of torrential rain in Xinjiang and southern China.The results are as follows:The extreme rainstorm were in the stable two ridges one trough large-scale circulation background;It caused by elevated convection;The rainstorm zone were located in the right side of southwest jet stream inlet region in high altitude,the Confluence area on the 500 hPa from southwest stream before central Asia low vortex and south airflow From western Pacific subtropical high on the west side,front convergence zone of southeast low level jet stream outlet zone on the 700 hPa and the overlapping area of the negative variable temperature area behind the cold front on the ground map;Central Asia low vortex of 500 hPa,low level jet of 700 hPa and its anterior convergence area,strong frontal zone 800~600 hPa that the elevated convection were triggered;Strong convergence and high level strong divergence nearby the lower troposphere 700 hPa,it provides dynamic triggering conditions for the development of elevated convection,so that SW Warm and Wet Air Flow in the Front of Central Asian Low Vortex and water vapor bypasses and crosses the Qinghai-Xizang Plateau,from the Arabian sea,Bay of Bengal,South China Sea and Western Pacific and Convergence and concentration rapidly in rainstorm area,and constantly being lifted to the sky,it provides sufficient water vapor condition for extreme rainstorm.The extreme rainstorm in this region is quite different from that in other parts of Xinjiang;There were also significant differences between the elevated convection system in south China.
作者
庄晓翠
李博渊
秦榕
李如琦
张云惠
白松竹
ZHUANG Xiaocui;LI Boyuan;QING Rong;LI Ruqi;ZHANG Yunhui;BAI Songzhu(Institut of Desert Meteorology of China Meteorological Administration,Urumqi 830002,Xinjiang,China;Altai Meteorological Office of Xinjiang Uygur Autonomous Region,Altai 836500,Xinjiang,China;Xinjiang Meteorological the Information Center,Urumqi 830002,Xinjiang,China;Xinjiang Meteorological Observatory,Urumqi 830002,Xinjiang,China;Hami Meteorological Office of Xinjiang Uygur Autonomous Region,Hami 839000,Xinjiang,China)
出处
《高原气象》
CSCD
北大核心
2020年第5期947-959,共13页
Plateau Meteorology
基金
国家自然科学基金项目(41965002)
国家重点研发计划重点专项(2018YFC1507103)
中亚大气科学研究基金项目(CAAS201921)。
关键词
区域极端暴雨
高架对流
水汽输送
Regional extreme rainstorm
elevated convection
water vapor transmission
