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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (3): 21-35.DOI: 10.7522/j.issn.1000-694X.2022.00126

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Research progress on the influence mechanism of climate anomalies in arid and semi-arid regions in China

Shanling Cheng1(), Haipeng Yu2(), Yu Ren1, Jie Zhou1, Hongyu Luo2,3, Chenxi Liu4, Yongqi Gong1   

  1. 1.School of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China
    2.Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions / Nagqu Station of Plateau Climate and Environment,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
    4.Lanzhou Regional Climate Center / Gansu Meteorological Bureau,Lanzhou 730020,China
  • Received:2022-07-28 Revised:2022-08-29 Online:2023-05-20 Published:2023-05-31
  • Contact: Haipeng Yu

Abstract:

The arid and semi-arid regions cover more than half of China's land area, which are sensitive to global climate change and human activities with fragile ecological environment. Extreme climate events are frequent and strong in those regions, where the climate anomalies are not only modulated by the internal atmospheric variability, but also affected by the underlying surfaces such as sea surface temperature, sea ice and snow cover. These physical factors play a key role in the climate anomalies in arid and semi-arid regions. This article systematically reviews and sorts out the effects of these physical factors on climate anomalies in arid and semi-arid regions of China. Studies have shown that atmospheric teleconnection is an internal influencing factor of climate anomalies, and the circulation anomalies caused by its phase transition will cause climate anomalies in arid and semi-arid regions by regulating the position of jet stream, planetary wave activity, blocking intensity, and the location of trough-ridge. Sea surface temperature affects the climate anomalies in arid and semi-arid regions by influencing the intensity of monsoon and Walker circulation and the location of western Pacific subtropical high, in the meantime stimulating the response of atmospheric Rossby waves. Moreover, snow cover changes the thermal conditions of the underlying surfaces such as surface radiation and soil temperature and humidity through the albedo effect and hydrological effect, and then has a significant effect on the temperature and precipitation in arid and semi-arid regions by diabatic heating or changing atmospheric baroclinicity. On the basis of summarizing the existing research progresses and achievements, the paper points out that the synergistic mechanism among different factors and the contribution of each factor to the climate anomalies in the arid and semi-arid regions of China still need further research.

Key words: arid and semi-arid regions, climate anomaly, teleconnection, sea surface temperature, sea ice, snow cover

CLC Number: