PROGRESS IN GEOGRAPHY ›› 2019, Vol. 38 ›› Issue (7): 1069-1079.doi: 10.18306/dlkxjz.2019.07.011

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Regional strong winter wind events over Beijing-Tianjin-Hebei and the associated atmospheric circulation changes during 1979-2017

Xiaoxue SHI1,2(), Daoyi GONG1,2,*(), Yihong HU1,2   

  1. 1. Academy of Disaster Reduction and Emergency Management, Ministry of Emergency Management and Ministry of Education, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
    2. State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
  • Received:2019-03-15 Revised:2019-04-08 Online:2019-07-28 Published:2019-07-28
  • Contact: Daoyi GONG E-mail:sxx1020@mail.bnu.edu.cn;gdy@bnu.edu.cn
  • Supported by:
    National Natural Science Foundation of China, No. 41621061.

Abstract:

In this study, the variability of the strong wind events in the Beijing-Tianjin-Hebei (BTH) region during the period 1979 to 2017 and its relationship with atmospheric circulation were analyzed, by employing the daily average wind speed records from the meteorological stations and the ERA-Interim reanalysis data. The analysis boreal winter months cover November to March of the following year. During 1979-2017, there were 556 strong wind events, and nearly 90% of them were dominated by northerly winds. The frequency of strong wind events has decreased significantly at a rate of -1.77 d·(10 a)-1 (P<0.1), and the mean wind speed for these events has weakened with a trend of -0.07 m·s-1·(10 a)-1 (P<0.05). The regional and hemispheric atmospheric circulation anomalies were also analyzed. It was found that the East Asian westerly jet has a significant positive correlation with the frequency of strong wind events. The North Atlantic region has a negative-positive stratospheric circulation anomaly distribution in the north-south direction, and its correlation coefficients with both the frequency and mean wind speed of strong wind events are close to 0.30. These analyses suggest that the wind variability in northern China is related to the regional atmospheric circulation over East Asia, the large-scale circulation in the northern hemisphere, and the upstream circulation in the North Atlantic

Key words: regional strong wind events, East Asian westerly jet stream, atmospheric circulation in the northern hemisphere, Beijing-Tianjin-Hebei region