北京上甸子站大气CO_2及δ^(13)C(CO_2)本底变化  

Monitoring Atmospheric CO_2 and δ^(13)C( CO_2) Background Levels at Shangdianzi Station in Beijing,China

作　　者：夏玲君[1,2] 周凌晞[1] 刘立新[1] 张根[1] 

机构地区：[1]中国气象科学研究院,北京100081 [2]南京信息工程大学大气物理学院,南京210044

出　　处：《环境科学》2016年第4期1248-1255,共8页Environmental Science

基　　金：国家国际科技合作专项(2015DFG21960;2011DFA21090);国家自然科学基金项目(40905066;41175116;41273097;41505108;41505123);中国气象局气候变化专项(CCSF201331);中国气象局气象关键技术集成与应用项目(CMAGJ2013M73);江苏省高校研究生科技创新项目(KYLX_0834);中国气象科学研究院基本科研业务费专项(2014Y005;2015Y002)

摘　　要：基于北京上甸子站(SDZ)2007~2013年大气CO_2及2009~2013年大气δ13C(CO_2)瓶采样观测资料,筛分获得混合均匀且未受局地污染影响、具代表性的大气CO_2及δ13C(CO_2)本底数据.2007~2013年SDZ站大气CO_2年均本底浓度变化范围为385.6×10-6~398.1×10-6,年均增长率为2.0×10-6a-1;2009~2013年其大气δ13C(CO_2)年均本底值变化范围为-8.38‰^-8.52‰,年均增长率为-0.03‰·a-1.SDZ站2007~2013年的7~9月月均浓度最低水平均出现在2008年,且2007~2008年增长率仅为0.3×10-6a-1,推测主要源于2008年奥运期间北京及其周边省市节能减排措施实施导致碳排放量减少.SDZ站大气CO_2本底浓度季节变化最低值出现在8月,最高值出现在3月,季节振幅达到23.9×10-6;大气δ13C(CO_2)与CO_2季节变化特征大致呈镜像关系,其季节振幅为1.03‰.对SDZ站CO_2源汇的碳同位素"signature"(δs)研究表明,供暖季Ⅰ(01-01~03-14)和Ⅱ(11-15~12-31)的δs分别为-21.30‰和-25.39‰,推测主要源自化石燃料与生物质燃烧的影响;其植物生长季的δbio值为-21.28‰,推测主要来自植被活动的贡献.The study presented time series of atmospheric CO2 concentrations from flask sampling at SDZ regional station in Beijing during 2007 and 2013,together with δ^13C（ CO2） values during 2009 and 2013. The＂representative data＂of CO2 and δ^13C（ CO2） were selected from the complete data for further analysis. Annual CO2 concentrations increased from 385. 6 × 10-6in 2007 to 398. 1 × 10^-6in 2013,with an average growth rate of 2. 0 × 10^-6a^-1,while the δ13C values decreased from-8. 38‰ in 2009 to-8. 52‰ in 2013,with a mean growth rate of-0. 03‰·a^-1. The absolute increase of CO2 from 2007 to 2008 reached the lowest level during 2007 and2013,possibly due to relatively less carbon emissions during the 2008 Olympic Games period. The peak-to-peak amplitudes of atmospheric CO2 and δ^13C seasonal variations were 23. 9 × 10^-6and 1. 03‰,respectively. The isotopic signatures of CO2 sources / sinks were also discussed in this study. The δsvalue for heating season Ⅰ（ Jan. 01-Mar. 14） was-21. 30‰,while-25. 39‰ for heating season Ⅱ（ Nov. 15-Dec. 31）,and for vegetative season（ Mar. 15-Nov. 14） the δbiovalue was estimated to be-21. 28‰,likely suggesting the significant impact of fossil fuel and corn straw combustions during winter heating season and biological activities during vegetative season.

关 键 词：大气CO2 大气δ^13C(CO2) 本底变化 碳同位素标记 瓶采样观测 

分 类 号：X131.1[环境科学与工程—环境科学] X831