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《Meteorological Science and Technology》 2018-05
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Distribution Characteristics of Low-Visibility Weather Phenomena in Sichuan Province from 1981 to 2013

Huang Xiaolong;Wang Liwei;Wu Wei;Chen Zhongyu;Yuan Yue;Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province;Sichuan Meteorological Observation and Data Centre;Jilin Meteorological Information Centre;  
Based on the observation data of nine kinds of low-visibility phenomena(mist,fog,snowstorm,blowing snow,smoke,haze,sand storm,blowing sand,and dust)in Sichuan Province from 1981 to 2013,we discuss the number of occurrence days,occurrence probability,and space distribution characteristics.The results show that the number of occurrence days of low-visibility phenomena in Sichuan Province was:mistfog haze dustsmoke blowing sandsandstorm blowing snow snowstorm.The numbers of mist and fog days were 176 days and 29 days,and the probability of daily occurrence was 48%and 8%,far higher than other weather phenomena.As for seasonal variation,fog and haze mainly occurred in autumn and winter,and haze,blowing snow,and snowstorm in winter,sand dust in spring,dust storms mainly in winter and spring,and smoke mainly in spring and autumn.The trend of mist in Sichuan remained stable;the smoke was increasing;and the fog,haze,sandstorm,blowing sand and dust were descending.The stable atmosphere,sufficient water vapor,week wind,concentrated population and large emissions were favorable to the formation of fog,mist,basin haze and smoke.Unreasonable use of water and land resources and dust weather in North China along with the southward movement of cold air are the important causes of sand dust weather.Blowing snow and snowstorm occurred in the western Sichuan plateau with larger winter snowfall and higher wind speed.
【Fund】: 国家自然科学基金“青藏高原热力强迫与印度洋的相互作用及其对亚洲夏季风的影响”(41605038);; 四川省气象局课题“气象台站历史沿革数据质量控制与可视化系统”(2015-开发-18)资助
【CateGory Index】: P44
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