干旱区生态环境知识资源中心(Arid): Convection Initiation Associated with a Boundary Layer Convergence Line over a Real-World Sharp Vegetation-Contrast Area

Arid

DOI	10.1175/MWR-D-22-0083.1
	Convection Initiation Associated with a Boundary Layer Convergence Line over a Real-World Sharp Vegetation-Contrast Area
	Liu, Hongjun; Meng, Zhiyong; Zhu, Yuning; Huang, Yipeng
通讯作者	Meng, ZY
来源期刊	MONTHLY WEATHER REVIEW
ISSN	0027-0644
EISSN	1520-0493
出版年	2023
卷号	151 期号:5 页码:1189-1212
英文摘要	Convection initiation (CI) has remained a major challenge in weather forecasting worldwide. The Hetao area in North China, the location of Asia's largest irrigation area, contains highly heterogeneous vegetation where near -surface convergence lines (boundaries) parallel to the oasis-desert border often emerge over the desert and initiate convec-tion. This study investigated the evolution of such a boundary and its influence on the CI process where a series of cells were successively initiated along the boundary on 4 June 2013. Our results indicated that uneven surface heating across the oasis-desert border produced mesoscale thermal circulation. The westerly oasis breeze in the thermal circulation con-verged with the southerly background wind and formed a boundary over the desert along the high-temperature contrast line. A middle-hemisphere westerly trough further enhanced uplift and facilitated CI. Our simulation revealed that the first 30-dBZ parcels in each cell originated from either the desert side at a low level or the oasis side at a middle level, rather than from the oasis at a low level, as indicated by previous idealized studies. Southerly low-level parcels veered above the boundary and experienced a longer lifting time over the desert, while western parcels originating from the oasis experi-enced a shorter lifting time and smaller vertical displacement, resulting in middle-level parcels instead of low-level parcels that reached their level of free convection. Even though CI occurred over a surface boundary without a near-surface stable layer, the inflow may have originated from middle levels rather than in contact with the surface.
英文关键词	Convection lines Mesoscale processes Secondary circulation Vegetation -atmosphere interactions Topographic effects Boundary layer
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000986194200002
WOS关键词	SEA-BREEZE CIRCULATION ; SOIL-MOISTURE ; SURFACE HETEROGENEITY ; STORM INITIATION ; LAKE BREEZES ; SCALE FLOW ; PART II ; LAND ; MODEL ; IMPACT
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397872
推荐引用方式 GB/T 7714	Liu, Hongjun,Meng, Zhiyong,Zhu, Yuning,et al. Convection Initiation Associated with a Boundary Layer Convergence Line over a Real-World Sharp Vegetation-Contrast Area[J],2023,151(5):1189-1212.
APA	Liu, Hongjun,Meng, Zhiyong,Zhu, Yuning,&Huang, Yipeng.(2023).Convection Initiation Associated with a Boundary Layer Convergence Line over a Real-World Sharp Vegetation-Contrast Area.MONTHLY WEATHER REVIEW,151(5),1189-1212.
MLA	Liu, Hongjun,et al."Convection Initiation Associated with a Boundary Layer Convergence Line over a Real-World Sharp Vegetation-Contrast Area".MONTHLY WEATHER REVIEW 151.5(2023):1189-1212.