Horizontal visibility trends in China 1981-2005

被引：212

作者：

Che, Huizheng ^{[1
]}

Zhang, Xiaoye ^{[1
]}

Li, Yang ^{[2
]}

Zhou, Zijiang ^{[3
]}

Qu, John J. ^{[4
]}

机构：

[1] Chinese Acad Meteorol Sci, Ctr Atmosphere Watch & Serv, Key Lab Atmospher Chem, CMA, Beijing 100081, Peoples R China

[2] Chinese Meteorol Adm, Atmospher Observat Technol Ctr, Beijing, Peoples R China

[3] Chinese Meteorol Adm, Natl Meteorol Informat Ctr, Beijing, Peoples R China

[4] George Mason Univ, Coll Sci, EastFIRE Lab, Fairfax, VA 22030 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2007年 / 34卷 / 24期

关键词：

D O I：

10.1029/2007GL031450

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Trends in Chinese horizontal visibility, the frequency of visibility > 19 km, and haziness for the period between 1981 and 2005 were evaluated based on data for daily horizontal visibility. Annual means were calculated for each station and for China as a whole. Linear regression analysis was used to characterize long-term annual trends in these variables. Over the past 25 years, there has been a significant decrease in horizontal visibility (-2.1 km per decade from 1990 to 2005) and the frequency of visibility > 19 km (-3.5% per decade) but a significant increase in the 75th percentile annual extinction coefficients (25% per 25 year). According to rapid increase of total energy consumption, the consistent spatial and temporal variations of visibility and haze support the speculation that increased aerosol loadings were responsible for the observed decreases in horizontal visibility over much of East China.

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