RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (03): 454-460.doi: 10.11870/cjlyzyyhj201703016

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VARIATION OF FOG AND THE UNDERLYING MECHANISMS BASED ON METEOROLOGICAL OBSERVATION STATIONS IN ENSHI

WANG Chuan-yi1, ZHAO Cai-ling2, LUO Ju-ying1   

  1. 1. Enshi Autonomous Prefecture Meteorological Bureau, Enshi 445000, China;
    2. Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climatic Change and Reducing Disaster of China Meteorological Administration Institute of Arid Meteorology China Meteorological Administration, Northwestern Regional Center of Numerical Weather Prediction, Lanzhou 730000, China
  • Received:2016-06-16 Revised:2016-10-31 Online:2017-03-20
  • Supported by:
    Science and Technplogy Development Foundation of Enshi Autonomous Prefecture Meteorological Bureau (No.201604)

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Abstract: Based on the observed data from eight meteorological observation stations in Enshi area from 1960 to 2015, fog variations and the underlying mechanisms were analyzed by using correlation analysis, linear tendency estimation method, and the Mann-Kendall mutation test (M-K test). The spatial distribution of fog in Enshi during 2000 to 2015 was different from that during 1960 to 1999, with a maximum center of fog being cut off from southwest to northeast, and a minimum center of fog from southwest to northeast. In the last 56 years, except for the continuously decreasing fog days in Xuanen, annual fog days the other stations increased after a shift in 1960s and 1970s, and then decreased in the late period of 20th Century, followed by a shift in 2012. The changes started in southwest of Enshi, followed by northwest, and then east. The fog in Enshi significantly reduced in the recent 16 years, and fog in the north area decreased (-40~-20 d·(10a)-1) much more quickly than in south area (-4d·(10a)-1). And the influence of temperature and precipitation on fog days is different from station to station. During the last 16 years, the reduction of fog days in low mountain was related to temperature and wind speed, while related to the humidity in middle mountain.

Key words: fog, trend, reason

CLC Number: 

  • P49
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