Analysis of column-integrated aerosol optical thickness in beijing from aeronet observations

China Particuology Pub Date : 2006-12-01 DOI:10.1016/S1672-2515(07)60285-1

Xuehua Fan , Hongbin Chen , Philippe Goloub , Xiang'ao Xia , Wenxing Zhang , Bernadette Chatenet

{"title":"Analysis of column-integrated aerosol optical thickness in beijing from aeronet observations","authors":"Xuehua Fan , Hongbin Chen , Philippe Goloub , Xiang'ao Xia , Wenxing Zhang , Bernadette Chatenet","doi":"10.1016/S1672-2515(07)60285-1","DOIUrl":null,"url":null,"abstract":"<div>Aerosol Optical Thickness (AOT), water vapor content and derived Angstrom exponent acquired by a CIMEL sun photometer in Beijing are analyzed. Monthly means computed from quality-assured daily means, seasonal trends and inter-annual variations are presented and discussed. Summer has the highest seasonal average AOT at 440 nm (τa440), Angstrom exponent (α440–870) and water vapor content with the values 0.93, 1.34 and 3.0 cm, respectively. The second highest seasonal average τa440 appears in spring with the largest variation of α440–870 and minimum α440–870 0.99 due to the impact of coarse particles. The minimum seasonal average τa440 (0.44) and water vapor content (0.4 cm) appear in winter. The annual average τa440, α440–870 and water vapor content for about 4-year observation period are 0.70, 1.19 and 1.4 cm, respectively. All monthly average Angstrom exponents are within 0.8-1.4, which indicates aerosol in Beijing is a very complex mixture of both fine- and coarse-mode particles (from anthropogenic influence and natural mineral dust).</div>","PeriodicalId":100239,"journal":{"name":"China Particuology","volume":"4 6","pages":"Pages 330-335"},"PeriodicalIF":0.0000,"publicationDate":"2006-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1672-2515(07)60285-1","citationCount":"20","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"China Particuology","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1672251507602851","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 20

Abstract

Aerosol Optical Thickness (AOT), water vapor content and derived Angstrom exponent acquired by a CIMEL sun photometer in Beijing are analyzed. Monthly means computed from quality-assured daily means, seasonal trends and inter-annual variations are presented and discussed. Summer has the highest seasonal average AOT at 440 nm (τ_a440), Angstrom exponent (α_440–870) and water vapor content with the values 0.93, 1.34 and 3.0 cm, respectively. The second highest seasonal average τ_a440 appears in spring with the largest variation of α_440–870 and minimum α_440–870 0.99 due to the impact of coarse particles. The minimum seasonal average τ_a440 (0.44) and water vapor content (0.4 cm) appear in winter. The annual average τ_a440, α_440–870 and water vapor content for about 4-year observation period are 0.70, 1.19 and 1.4 cm, respectively. All monthly average Angstrom exponents are within 0.8-1.4, which indicates aerosol in Beijing is a very complex mixture of both fine- and coarse-mode particles (from anthropogenic influence and natural mineral dust).

查看原文本刊更多论文

利用大气观测资料分析北京地区柱积分气溶胶光学厚度

对北京CIMEL太阳光度计测得的气溶胶光学厚度(AOT)、水汽含量和导出埃指数进行了分析。提出并讨论了由有质量保证的日平均值计算出的月平均值、季节趋势和年际变化。夏季平均AOT (τa440)、埃指数(α440 ~ 870)和水汽含量最高，分别为0.93、1.34和3.0 cm。季节平均τa440次高出现在春季，α440-870变化最大，α440-870变化最小，为0.99。最小季节平均τa440(0.44)和水汽含量(0.4 cm)出现在冬季。近4年观测周期的年均τa440、α440-870和水汽含量分别为0.70、1.19和1.4 cm。月平均埃斯特姆指数均在0.8 ~ 1.4之间，表明北京地区的气溶胶是细态和粗态粒子(来自人为影响和天然矿物粉尘)的复杂混合体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

China Particuology

自引率

0.00%

发文量