北京上甸子站大气CH<sub>4</sub>数据筛分及变化特征

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摘要

基于气团72h后向轨迹输送特征，结合数值统计方法，对北京上甸子站2010~2014年瓶采样样品大气CH₄进行污染/非污染数据筛分.结果表明约42%的数据筛分为污染数据，剩余数据则被认为是未受局地源汇污染、混合较为均匀的本底数据.基于这些本底数据对上甸子站大气CH₄本底浓度变化特征进行研究，结果表明：观测期间上甸子站大气CH₄本底浓度从1884.0×10^-9（2010年）增长到1916.4×10^-9（2014年），年均增长率为8.5×10^-9/a.其季节变化特征与北半球平均状况类似，冬春季高、夏秋季低，高值出现在1~2月，低值出现在6~7月，季节振幅达32.8×10^-9，主要与·OH自由基浓度季节变化有关.此外，CH₄本底浓度年均值及平均季节变化月均值均高于同纬度带海洋边界层水平及全球大气本底站瓦里关站.

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	夏玲君
	刘立新

关键词 ：大气CH₄, 后向轨迹, 数据筛分, 北京上甸子站, 本底水平

Abstract：

Based on transport characteristics of air mass 72h back trajectories and statistical data filtered method, measurement data of atmospheric CH₄ obtained at Shangdianzi (SDZ) regional background station in Beijing during 2010 and 2014 were analyzed for non-pollution and pollution events. About 42% of the complete data set was filtered as pollution data, and the remainders not polluted by local emission sources were flagged as "representative background data". Variations of background CH₄ concentrations at SDZ station can be obtained based on the "representative background data". The annual mean background CH₄ concentrations varied from 1884.0×10^-9 in 2010 to 1916.4×10^-9 in 2014 observed at SDZ, with the averaged growth rate of 8.5×10^-9/a. Background atmospheric CH₄presented obvious seasonal fluctuations, the higher and lower levels of seasonal CH₄ cycle appeared in Jan-Feb and Jun-Jul, respectively, with the peak-to-peak amplitude of 32.8×10^-9. The seasonal variations of atmospheric CH₄ might be owing to the variations of OH concentration in atmosphere. Furthermore, the annual and "detrended" monthly CH₄ background concentrations observed at SDZ were higher than those of MBL at the same latitude and WLG global baseline station.

Key words： atmospheric CH₄ back trajectories data selection Shangdianzi station in Beijing background level

收稿日期: 2017-04-25

PACS:

X511

基金资助:

国家国际科技合作专项（2015DFG21960）；国家自然科学基金项目（40905066，41175116，41273097）；上海市气象与健康重点实验室开放基金项目（QXJK201501）；江西省气象科技面上项目（2017）

通讯作者: 刘立新,高级工程师,32899694@qq.com E-mail: 32899694@qq.com

作者简介: 夏玲君(1983-),女,江西鄱阳人,工程师,博士,主要研究方向为温室气体及其相关微量成分.发表论文10余篇.

引用本文:

夏玲君, 刘立新. 北京上甸子站大气CH₄数据筛分及变化特征[J]. 中国环境科学, 2017, 37(11): 4044-4051. XIA Ling-jun, LIU Li-Xin. Data selection and variation characteristics of atmospheric CH₄ observed at Shangdianzi station in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(11): 4044-4051.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2017/V37/I11/4044

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