气候变化领域集成服务门户(CCPortal): Understanding the Mechanisms of Summer Extreme Precipitation Events in Xinjiang of Arid Northwest China

CCPortal

DOI	10.1029/2020JD034111
	Understanding the Mechanisms of Summer Extreme Precipitation Events in Xinjiang of Arid Northwest China
	Ning G.; Luo M.; Zhang Q.; Wang S.; Liu Z.; Yang Y.; Wu S.; Zeng Z.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:15
英文摘要	As one of the aridest regions in the mid-latitudes, arid Northwest China (ANC) has scarce water resources year-round, its annual total precipitation is mainly contributed by summer extreme precipitation events, which may also cause disastrous flash floods. However, the physical mechanism and climatic features of extreme precipitation events in ANC are not fully understood and warrant in-depth investigations. Taking Xinjiang as an example, this study investigates the underlying mechanisms and long-term trend of extreme precipitation events in ANC during 1961–2019 using observational and reanalysis data sets. Results suggest that summer extreme precipitation events in ANC are characterized by a zonal wave pattern with the deepening of the western Siberian trough, central Asian high, and Mongolian high. Under the effects of the zonal wave pattern, the westerly and the easterly airflows anomalously intensify and converge in ANC, transporting a large amount of water vapor from the Arctic Ocean, the Caspian Sea, the Aral Sea, the Arabian Sea, and eastern China to ANC. Meanwhile, a deep anomalous cyclone center induced by the deep wave pattern appears over ANC, thus providing favorable conditions for the occurrence of extreme precipitation events in ANC. Over the long-term period, total summer precipitation and the frequency of extreme precipitation events in ANC show significant increasing trends, indicating that summer climate in ANC is becoming more humid, and extreme precipitation events are becoming more frequent. These findings provide scientific insights for understanding the formation mechanism of summer extreme precipitation events and mitigating the corresponding disasters in arid regions. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Arid Northwest China; convective activity; extreme precipitation; long-term trend; water vapor; zonal wave pattern
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237093
作者单位	School of Geography and Planning, Guangdong Key Laboratory for Urbanization and Geo-simulation, Guangdong Provincial Engineering Research Center for Public Security and Disaster, Sun Yat-sen University, Guangzhou, China; The Gansu Key Laboratory of Arid Climate Change and Reducing Disaster, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong; Key Laboratory of Environmental Change and Natural Disaster of the Ministry of Education, Faculty of Geographical Science, Academy of Disaster Reduction and Emergency Management of the Ministry of Education/Ministry of Civil Affairs, Beijing Normal University, Beijing, China; School of Atmospheric Sciences, Sichuan Key Laboratory for Plateau Atmosphere and Environment, Chengdu University of Information Technology, Chengdu, China; Center for Climate Physics, Institute for Basic Science, Pusan National University, Busan, South Korea; School of Atmospheri...
推荐引用方式 GB/T 7714	Ning G.,Luo M.,Zhang Q.,et al. Understanding the Mechanisms of Summer Extreme Precipitation Events in Xinjiang of Arid Northwest China[J],2021,126(15).
APA	Ning G..,Luo M..,Zhang Q..,Wang S..,Liu Z..,...&Zeng Z..(2021).Understanding the Mechanisms of Summer Extreme Precipitation Events in Xinjiang of Arid Northwest China.Journal of Geophysical Research: Atmospheres,126(15).
MLA	Ning G.,et al."Understanding the Mechanisms of Summer Extreme Precipitation Events in Xinjiang of Arid Northwest China".Journal of Geophysical Research: Atmospheres 126.15(2021).