干旱区生态环境知识资源中心(Arid): 西北半干旱区一次盛夏暴雨水汽追踪分析

Arid

	西北半干旱区一次盛夏暴雨水汽追踪分析
其他题名	Analysis of the water vapor tracking on a rainstorm in midsummer and in semi-arid region of Northwest China
	卢姝; 许东蓓; 严小杰; 麦哲宁; 丁艺涵
来源期刊	自然灾害学报
ISSN	1004-4574
出版年	2021
卷号	30 期号:5 页码:122-134
中文摘要	利用常规气象观测资料、ERA5逐小时再分析资料、中国自动站与CMORPH降水产品融合的逐时降水量网格数据集、FY-2G卫星TBB资料等,针对2019年7月21日陇东南暴雨过程,综合分析其环流背景场、中尺度云团特征、动力成因以及暴雨过程水汽环境和水汽输送特征,并应用HYSPLIT4追踪水汽源地。结果表明: 500 hPa槽、700 hPa切变线、副热带高压及低空急流是本次暴雨过程直接影响系统,暴雨主要受新生beta中尺度对流云团影响,TBB中心最大值< - 72℃。暴雨形成的基本动力机制为低层辐合、高层辐散,高空急流右侧的次级环流使暴雨区垂直上升运动得以加强和维持。暴雨发生时近地面比湿达14 k·kg~(-1),整层大气可降水量达20 mm以上。水汽通量诊断结果表明,暴雨过程的水汽主要为来自孟加拉湾、南海的南路水汽,其次是东海水汽沿副高南侧西行北上。在暴雨后期,受西风槽东移影响,南路水汽减弱。从水汽边界收支来看,暴雨前期以及暴雨过程中,南边界水汽收入最高。结束之后,南边界对流层中低层水汽转为支出,北、西边界为收入。240 h后向轨迹聚类结果表明:暴雨发生前期,3 000 m、5 000 m高度均存在偏西路径、偏南路径水汽。而在暴雨发生时刻,1 500 m水汽源地为东海、3 000 m为南海、5 000 m为孟加拉湾。不同高度层气块到达降水区时比湿较前期均减小,但三个层次相对湿度均在85%以上。
英文摘要	By the conventional meteorological observation data,ERA5 hourly reanalysis data,the data set of China automatic station and CMORPH precipitation product fusion grid and TBB data of FY-2G satellite,the study revealed circulation background field,mesoscale cloud cluster characteristics,dynamic cause,water vapor environment and water vapor transport characteristics of the rainstorm in southeast of Gansu Province on 21 July 2019,also tracked water vapor source using the HYSPLIT4. The results were as follows: the upper-level trough at 500hPa, shear line at 700hPa,subtropical high and low-level jet were the direct system affecting the rainstorm. The rainstorm was mainly affected by newly formed meso-beta scale convective clusters. The maximum value of TBB center was less than - 72℃. The basic dynamic mechanism for the rainstorm was due to convergence at lower levels and divergence at high levels. The secondary circulation in the right side of the upper-level jet strengthened and maintained the vertical ascending motion of the rainstorm area. The surface specific humidity was 14k·kg~(-1),and the total precipitable water was more than 20 mm when the rainstorm occurred. The water vapor flux diagnosis results were as follows: Water vapor mainly came from the Bay of Bengal and the South China Sea. Besides,water vapor from the East China Sea moved westerly along the south side of subtropical high. In the late stage of the rainstorm, the water vapor from the south affected by the eastward movement of the westerly trough weakened. Water vapor income of the southern border was the highest before the rainstorm occurred and when it occurred. Later water vapor budget of the southern border was negative,which of northern and western border was positive in the middle and low troposphere. The clustering results of 240 h backward trajectory were as follows: before the rainstorm,western route and southern route were shown on the trajectory graph at 3 000 m and 5 000 m. When the rainstorm occurred,water vapor source respectively was the East China Sea at 1 500 m,the South China Sea at 3 000 m and the Bay of Bengal at 5 000 m. When air mass arrived precipitation area,its specific humidity decreased but relative humidity was more than 85% at different levels.
中文关键词	陇东南地区 ; 暴雨 ; 水汽环境 ; 源地追踪
英文关键词	southeast in Gansu rainstorm water vapor environment source tracing
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:7120908
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/378170
作者单位	卢姝, 成都信息工程大学, 高原大气与环境四川省重点实验室, 成都, 四川 610225, 中国.; 许东蓓, 成都信息工程大学, 高原大气与环境四川省重点实验室, 成都, 四川 610225, 中国.; 严小杰, 成都信息工程大学, 高原大气与环境四川省重点实验室, 成都, 四川 610225, 中国.; 麦哲宁, 成都信息工程大学, 高原大气与环境四川省重点实验室, 成都, 四川 610225, 中国.; 丁艺涵, 成都信息工程大学, 高原大气与环境四川省重点实验室, 成都, 四川 610225, 中国.
推荐引用方式 GB/T 7714	卢姝,许东蓓,严小杰,等. 西北半干旱区一次盛夏暴雨水汽追踪分析[J],2021,30(5):122-134.
APA	卢姝,许东蓓,严小杰,麦哲宁,&丁艺涵.(2021).西北半干旱区一次盛夏暴雨水汽追踪分析.自然灾害学报,30(5),122-134.
MLA	卢姝,et al."西北半干旱区一次盛夏暴雨水汽追踪分析".自然灾害学报 30.5(2021):122-134.