Understanding the Mechanisms of Summer Extreme Precipitation Events in Xinjiang of Arid Northwest China,Journal of Geophysical Research: Atmospheres

当前位置： X-MOL 学术 › J. Geophys. Res. Atmos. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Understanding the Mechanisms of Summer Extreme Precipitation Events in Xinjiang of Arid Northwest China
Journal of Geophysical Research: Atmospheres ( IF 4.4 ) Pub Date : 2021-07-07 , DOI: 10.1029/2020jd034111
Guicai Ning _{1,

2} , Ming Luo _{1,

3} , Qiang Zhang ₄ , Shigong Wang ₅ , Zhen Liu ₆ , Yuanjian Yang ₇ , Sijia Wu ₁ , Zhaoliang Zeng ₈

Affiliation

School of Geography and Planning and Guangdong Key Laboratory for Urbanization and Geo‐simulation Sun Yat‐sen University Guangzhou510275 China
The Gansu Key Laboratory of Arid Climate Change and Reducing Disaster College of Atmospheric Sciences Lanzhou University Lanzhou730000 China
Institute of Environment Energy and Sustainability The Chinese University of Hong Kong Sha TinN.T., Hong Kong China
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 Beijing100875 China
Sichuan Key Laboratory for Plateau Atmosphere and Environment School of Atmospheric Sciences Chengdu University of Information Technology Chengdu610225 China
Center for Climate Physics Institute for Basic Science Pusan National University Busan South Korea
School of Atmospheric Physics Nanjing University of Information Science & Technology Nanjing China
Chinese Antarctic Center of Surveying and Mapping Wuhan University Wuhan China

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.

更新日期：2021-07-27

点击分享查看原文

点击收藏

阅读更多本刊最新论文

全部期刊列表>>