2007—2015年北京地区能见度时空变化特征

doi:10.3969/j.issn.1673-503X.2019.01.006

Abstract

Abstract:

Using the data from Daxing observation station,twenty-eight road automatic stations and regional automatic stations from 2007 to 2015,the temporal and spatial characteristics of visibility in Beijing were analyzed.The results show that the highest value of visibility appears in spring and the lowest one appears in summer.The annual and summer visibility in Beijing has increased significantly for the last nine years.From 2011 to 2014,the increase in the particulate matters results in low visibility in winter.The visibility in the northwest part is significantly higher than that in the southeast part.The annual spatial distribution of visibility features decreasing gradually from the northwest to the southeast,which is the same as those in autumn and winter.The factors that are highly correlated with visibility are as follows,i.e.relative humid,particulate matters,wind direction,wind speed,and rainfall.However,the degree of the correlation of these factors with the visibility is different according to the different months,seasons and years.During this period,the numbers of days with occurrence of the fog,haze and dust weather phenomena are all increasing.The frequency of visibility less than 10 km mainly increases and that of visibility less than 1 km decreases in the whole area.As for the case study,when the wet haze events (7.13%) occur,the visibility in Beijing becomes worse than when the dry haze events (44.29%) occur.

Key words: Visibility, Particulate matters, Haze

CLC Number:

P427.2⁺3

JIANG Jiang, GUO Wen-li, WANG Chun-ling. Temporal and spatial characteristics of visibility in Beijing from 2007 to 2015[J]. Journal of Meteorology and Environment, 2019, 35(1): 45-52.

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http://www.jme1984.net.cn/EN/Y2019/V35/I1/45

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Temporal and spatial characteristics of visibility in Beijing from 2007 to 2015

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