Climate Change Characteristics of Fog and Haze Critical Meteorological Conditions in Beijing
Yang Ruozi
Fang Xiaoyi
Gao Yun
Xiong Yajun
Ma Jingjin
Xing Pei
Dang Bing
Zhang Shuo
Abstract：In recent years,the number of days affected by the fog and haze weather in Beijing significantly increased,and lasted longer.The change have attracted more and more attention of the scientists.Meteorological conditions are the objective factors of fog and haze pollution formation,namely.Based on the fog and haze observation data (2013-2015) and meteorological observation data (1961-2015) in Beijing meteorological observatory,this paper studied the climate change characteristics of fog and haze critical meteorological conditions.The results show that the critical meteorological conditions,which promoted the accumulation of fog and haze,are the average daily wind speed ≤ 1.9 m/s,daily relative humidity≥76％,south wind direction,and which suppressed the accumulation of fog and haze,are the average daily wind speed ≥ 2.6 m/s,daily relative humidity ≤ 69％,daily precipitation ≥ 0.5 mm.For the wind speed,the days of low wind speed showed an increasing trend,and more for the southwest,meanwhile the days of high wind speed showed a decreasing trend,which caused the capacity of the pollutants removal decreased and played a key role in the accumulation of pollutants,for the daily relative humidity,the days of high daily relative humidity showed a decreasing trend,and the days of low daily relative humidity showed an increasing trend,for the daily precipitation,the days of high daily precipitation showed a decreasing trend from 1961 to 2015 in Beijing meteorological observatory.The change of relative humidity conditions is conducive to the dissipation of fog and haze,while the change of wind speed,wind direction and precipitation condition is not conducive to the spread and settlement of fog and haze.Some research shows that,wind speed conditions play a more decisive role in the formation and dissipation of fog and haze than others,therefore,the increase of low wind speed days is an important reason for air pollution in Beijing area,and meanwhile the adverse wind direction condition increases the accumulation of pollutants.
Keywords：fog and hazecritical meteorological conditionclimate change
Publication Date：2017-07-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 14-20 )