干旱区生态环境知识资源中心(Arid): 河西走廊中西部干旱区极端暴雨个例分析

Arid

	河西走廊中西部干旱区极端暴雨个例分析
其他题名	Case Analysis of Extreme Rainstorm in Arid Zone of the Midwestern Gansu Corridor
	孔祥伟 1; 陶健红 2; 刘治国 2; 傅朝 1; 吉惠敏 1
来源期刊	高原气象
ISSN	1000-0534
出版年	2015
卷号	34 期号:1 页码:70-81
中文摘要	利用常规、自动气象观测站资料、卫星资料及NCEP 1°*1°再分析资料, 对2012年6月4-5日河西走廊中西部干旱区极端暴雨天气过程的影响系统配置、中尺度特征、水汽输送、不稳定能量等方面进行了诊断分析。结果表明: 此次暴雨发生在地面冷锋过境后, 降温冷凝作用明显, 对流层高层存在强抽吸作用, 中层高原低涡受其下游弱脊阻挡较长时间维持在暴雨区上空, 低层存在切变线, 高低空系统的耦合提供了中尺度对流系统发生、发展的有利条件; 水汽主要来自对流层中低层东、西两路及高层南路三支水汽输送通道, 西路水汽输送强度最大, 东路水汽输送受小高压影响显著, 暴雨开始后6 h才完整建立, 暴雨中心整层大气可降水量达到了该地区夏季平均值的两倍多; 通过降温、增湿作用近地面出现对流不稳定能量, 自由对流高度较低; 涡旋云系的冷空气侵入处, 不断激发出6个beta中尺度的对流单体, 暴雨中心玉门两次受其中4个单体的影响, 产生短时强降水。
英文摘要	An extreme rainstorm has occurred in the midwestern of Gansu Corridor arid zone on 4-5 June 2012. Using the data of conventional and automatic weather stations, FY-2D satellite cloud image as well as NCEP 1°*1° reanalysis data, the impacts of influence system configuration, meso-scale characteristics, water vapor transport and unstable energy have been analyzed. The main results are as follows. After the ground cold front had passed, rainstorm happened, cooling condensation effect was significant. No convergence system formed on ground, while strong suction existed in upper troposphere; plateau low vortex which was blocked by its downstream weak ridge stayed longer over the rainstorm area in middle troposphere; a shear line could be found in low troposphere, the configuration of the upper and low influence systems provided meso-scale convection conditions. Water vapor came from east and west in the low troposphere and south in the upper troposphere, the west vapor transport was strongest, and east vapor transport was affected significantly by high pressure. The whole precipitation water was twice more than the climate. Cooling and humidifying in the boundary layer forced the convective energy to be unstable, and free convection altitudes was low, without the need of strong uplift triggering mechanism. The six meso-beta-scale convection cells had been activated at the cold air intrusion of low vortex cloud, and Yumen station which was affected by four convection cells was divided into two periods to produce short-time severe precipitation.
中文关键词	河西走廊中西部 ; 极端暴雨 ; 高原低涡
英文关键词	Midwestern Gansu Corridor Extreme rainstorm Plateau low vortex
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:5383451
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232829
作者单位	1.兰州中心气象台, 兰州, 甘肃 730020, 中国; 2.甘肃省气象局, 兰州, 甘肃 730020, 中国
推荐引用方式 GB/T 7714	孔祥伟,陶健红,刘治国,等. 河西走廊中西部干旱区极端暴雨个例分析[J],2015,34(1):70-81.
APA	孔祥伟,陶健红,刘治国,傅朝,&吉惠敏.(2015).河西走廊中西部干旱区极端暴雨个例分析.高原气象,34(1),70-81.
MLA	孔祥伟,et al."河西走廊中西部干旱区极端暴雨个例分析".高原气象 34.1(2015):70-81.