气候变化领域集成服务门户(CCPortal): Diurnal Characteristics in Summer Water Vapor Budget and Transport over the Tibetan Plateau

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DOI	10.3390/atmos14020322
	Diurnal Characteristics in Summer Water Vapor Budget and Transport over the Tibetan Plateau
	Wang, Huimei; Zhao, Ping
发表日期	2023
EISSN	2073-4433
卷号	14 期号:2
英文摘要	Using the ERA5 reanalysis dataset during the period 1979-2019, the diurnal variation in summer water vapor budget (Bt) over the Tibetan Plateau (TP) is investigated in this study. It is found that the TP Bt shows a distinct diurnal cycle. It tends to increase in the morning, reaches a peak in the afternoon, and falls to a minimum in the early morning. The diurnal variations in four boundary water vapor budgets of the TP contribute to the growth in the TP Bt from the early morning to the afternoon, of which the western and eastern boundaries are more important. To understand the reasons for the diurnal variations in boundary water vapor budgets, the temporal evolutions of water vapor transports and relevant circulations at the four boundaries are examined. The results show that the temporal evolutions of water vapor transports and budgets at the four boundaries are essentially regulated by the changes in the orographic thermodynamic effect. Specifically, rapid and strong warming (cooling) on the TP slopes generates anomalous water vapor inputs (outputs) by anomalous upslope (downslope) flows during the daytime (nighttime). At the southern and western boundaries, apart from the terrain effects, the diurnal variation in the Indian southerly monsoon also has an effect on the changes in water vapor budgets by modulating the water vapor input towards the TP below 700 hPa. At the northern and eastern boundaries, under the orographic thermodynamic effects, low-level water vapor transports towards the TP accompanying by plateau-scale vertical circulations, exist significant diurnal variations and thereby adjust the boundary water vapor budgets. In this study, it is also found that the deviated water vapor flux vectors over the TP present a daily clockwise rotation, which mainly results from the diurnal variation in wind below 450 hPa. In addition, the largest amount of precipitation over the TP occurs 2-3 h after the Bt peak.
关键词	water vapor budget diurnal variation Tibetan Plateau terrain thermodynamic effect
英文关键词	PRECIPITATION; CHINA; EAST
WOS研究方向	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000938825600001
来源期刊	ATMOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283765
作者单位	Nanjing University of Information Science & Technology; China Meteorological Administration; Chinese Academy of Meteorological Sciences (CAMS); China Meteorological Administration; Chinese Academy of Meteorological Sciences (CAMS)
推荐引用方式 GB/T 7714	Wang, Huimei,Zhao, Ping. Diurnal Characteristics in Summer Water Vapor Budget and Transport over the Tibetan Plateau[J],2023,14(2).
APA	Wang, Huimei,&Zhao, Ping.(2023).Diurnal Characteristics in Summer Water Vapor Budget and Transport over the Tibetan Plateau.ATMOSPHERE,14(2).
MLA	Wang, Huimei,et al."Diurnal Characteristics in Summer Water Vapor Budget and Transport over the Tibetan Plateau".ATMOSPHERE 14.2(2023).