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崇明2010年8月高CO浓度的成因分析

发表时间:2012-11-15  浏览量:1032  下载量:316
全部作者: 何京伟,王聿绚
作者单位: 清华大学地球系统科学研究中心地球系统数值模拟教育部重点实验室;清华大学环境学院
摘 要: 利用清华大学崇明站点的CO和气象观测资料,分析了2010年8月崇明CO的变化,结果发现:尽管由于东亚夏季风的影响,崇明8月的平均CO浓度较低,其月均值为330 ppb,但有3个时段的CO值异常升高,其平均值超过600 ppb,这3个时段分别为1日至4日,12日至17日和28日至30日。通过CO和天气条件的相关性分析,发现崇明的高CO与夏季季风环流密切相关,西太平洋副热带高压变化引起的下沉逆温和受台风影响形成的稳定气层是造成崇明CO浓度增加的气象成因。进一步通过GEOS-Chem大气化学传输模式的敏感性试验,结果指出:8月1日至4日和12日至17日的高CO主要来源于长三角地区人为源的区域排放,而8月28日至30日的高CO主要来源于崇明站点人为源的局地排放。崇明夏季地面CO浓度的异常升高取决于气象条件和排放源的共同作用。
关 键 词: 大气科学;CO混合比;气象条件;人为源排放;GEOS-Chem模式
Title: Analysis of high levels of CO at Chongming in August 2010
Author: HE Jingwei, WANG Yuxuan
Organization: Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University; School of Environment, Tsinghua University
Abstract: In this paper the variations of surface CO mixing ratios in August 2010 at Chongming, a remote rural site northeast of Shanghai founded by Tsinghua University, are analyzed. The results show that although the monthly mean concentrations of CO were low due to East Asia summer monsoon, high levels of CO pollution episodes occured during three time periods: 1-4, 12-17 and 28-30 August 2010. The correlation analysis of CO with meteorological parameters indicates that the subsidence flow associated with the West Pacific subtropical high and the stable layer associated with typhoon are the two meteorological causes of the high CO episodes. Sensitive simulations using the GEOS-Chem chemical transport model indicate that the high CO concentrations during 1-4 and 12-17 August 2010 originate from regional anthropogenic emissions in the Yangtze Delta region, while high CO levels during 28-30 August 2010 come from local emissions around Chongming. We conclude that abnormally high CO levels at Chongming in August 2010 are caused by the joint influence of anthropogenic emissions and favorable weather conditions.
Key words: atmospheric sciences; CO mixing ratios; weather conditions; anthropogenic emissions; GEOS-Chem model
发表期数: 2012年11月第21期
引用格式: 何京伟,王聿绚. 崇明2010年8月高CO浓度的成因分析[J]. 中国科技论文在线精品论文,2012,5(21):2079-2084.
 
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