| 北京上甸子站大气CO2及δ13C(CO2)本底变化 |
| 摘要点击 1984 全文点击 1015 投稿时间：2015-10-20 修订日期：2015-12-04 |
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| 中文关键词 大气CO2 大气δ13C(CO2) 本底变化 碳同位素标记 瓶采样观测 |
| 英文关键词 atmospheric CO2 atmospheric δ13C(CO2) background level carbon isotopic signature flask sampling |
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| 中文摘要 |
| 基于北京上甸子站(SDZ) 2007~2013年大气CO2及2009~2013年大气δ13C(CO2)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CO2及δ13C(CO2)本底数据. 2007~2013年SDZ站大气CO2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2.0×10-6 a-1; 2009~2013年其大气δ13C(CO2)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0.3×10-6 a-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CO2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(CO2) 与CO2季节变化特征大致呈镜像关系,其季节振幅为1.03‰. 对SDZ站CO2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. |
| 英文摘要 |
| The study presented time series of atmospheric CO2 concentrations from flask sampling at SDZ regional station in Beijing during 2007 and 2013, together with δ13C(CO2) values during 2009 and 2013. The "representative data" of CO2 and δ13C (CO2) were selected from the complete data for further analysis. Annual CO2 concentrations increased from 385.6×10-6 in 2007 to 398.1×10-6 in 2013, with an average growth rate of 2.0×10-6 a-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 and 2013, possibly due to relatively less carbon emissions during the 2008 Olympic Games period. The peak-to-peak amplitudes of atmospheric CO2 and δ13C seasonal variations were 23.9×10-6 and 1.03‰, respectively. The isotopic signatures of CO2 sources/sinks were also discussed in this study. The δs value 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 δbio value 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. |
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