气候变化领域集成服务门户(CCPortal): Triggering effects of large topography and boundary layer turbulence on convection over the Tibetan Plateau

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DOI	10.5194/acp-23-3299-2023
	Triggering effects of large topography and boundary layer turbulence on convection over the Tibetan Plateau
	Xu, Xiangde; Tang, Yi; Wang, Yinjun; Zhang, Hongshen; Liu, Ruixia; Zhou, Mingyu
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	3299
结束页码	3309
卷号	23 期号:5 页码:11
英文摘要	In this study, we analyze the diurnal variations and formation mechanisms of low clouds at different elevations. We further discuss whether there exists a triggering mechanism for convection over the Tibetan Plateau (TP) and whether there is an association among low air density, strong turbulence, and ubiquitous popcorn-like cumulus clouds. The buoyancy term (BT) and shearterm (ST) over the TP are significantly greater than those at low elevations, which is favorable for the formation of an increasing planetary boundary layer height (PBLH) and also plays a key role in the convective activities in the lower troposphere. From the viewpoint of global effects,the triggering of convection by boundary layer dynamics is analyzed over the TP, but also in the Northern Hemisphere over the Rocky Mountains. It is foundthat ST and BT are strong over both high-elevation regions. The strong thermal turbulence and large-scale ascending motion jointly result inobvious positive values of PBLH-LCL (lifting condensation level) under low relative humidity (RH) conditions over the TP. The obvious large-scale subsidence on both sides of the Rocky Mountains, especially the western side, leads to inversion above the PBL and lower RH within the PBL, which further leads to negative values ofPBLH-LCL and decreased low cloud cover (LCC) in most parts of the Rocky Mountains. The slightly greater-than-zero PBLH-LCL corresponds spatially to increased LCC in the partial regions of the central Rocky Mountains. Thus, less LCC is generated at the Rocky Mountains compared to the TP.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000948880600001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273758
作者单位	Chinese Academy of Meteorological Sciences (CAMS); Chinese Academy of Sciences; China University of Geosciences; Peking University; China Meteorological Administration; National Marine Environmental Forecasting Center
推荐引用方式 GB/T 7714	Xu, Xiangde,Tang, Yi,Wang, Yinjun,et al. Triggering effects of large topography and boundary layer turbulence on convection over the Tibetan Plateau[J],2023,23(5):11.
APA	Xu, Xiangde,Tang, Yi,Wang, Yinjun,Zhang, Hongshen,Liu, Ruixia,&Zhou, Mingyu.(2023).Triggering effects of large topography and boundary layer turbulence on convection over the Tibetan Plateau.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(5),11.
MLA	Xu, Xiangde,et al."Triggering effects of large topography and boundary layer turbulence on convection over the Tibetan Plateau".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.5(2023):11.