| 青奥会期间基于δ13C观测的大气CO2来源解析 |
| 摘要点击 3787 全文点击 1201 投稿时间：2016-05-07 修订日期：2016-07-27 |
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| 中文关键词 城市大气CO2 高频原位观测 稳定同位素δ13 C 青奥会 长三角 |
| 英文关键词 urban atmospheric carbon dioxide high-frequency in-situ observation stable isotope δ13 C Youth Olympic Game Yangtze River Delta |
| 作者 | 单位 | E-mail | | 徐家平 | 南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044 | fengxuxudechui@sina.com | | 李旭辉 | 南京信息工程大学大气环境中心, 南京 210044 | | | 肖薇 | 南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044 | | | 次仁旺姆 | 南京信息工程大学大气环境中心, 南京 210044
西藏林芝市气象局, 林芝 860000 | | | 温学发 | 中国科学院地理科学与资源研究所生态系统网络观测与模拟实验室, 北京 100101 | | | 刘寿东 | 南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044 | | | 杜雪婷 | 南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044 | | | 曹畅 | 南京信息工程大学大气环境中心, 南京 210044
南京信息工程大学大气环境与装备技术协同创新中心, 南京 210044 | |
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| 中文摘要 |
| 开展城市冠层大气CO2及其δ13 C的观测有助于解析自然源与人为源在区域碳循环中的作用. 本研究于南京青奥会期间开展了大气CO2及其δ13 C高频原位观测，在小时尺度至日尺度上对比了有无临时排放管制期间大气CO2及其δ13 C的差异. 研究发现，短期减排对降低区域尺度大气CO2浓度有明显的短期效应（21×10-6），在整个青奥会临时管控期间长三角地区实际削减燃煤排放5%. 本研究进一步采用Miller-Tans方法确定了长三角地区的CO2排放源同位素组分；基于文献调查，提供了长三角地区主要人为源和自然源的δ13 C信息；量化了长三角夏季CO2地表净通量、植被通量及人为排放通量. 结果表明，水泥工业过程排放是长三角地区夏季大气δ13 C富集的主要人为原因（2.36‰）. 夏季长三角地区植被作用可以抵消23%~39%的人为CO2排放. 本文旨在通过采用自上而下的观测数据与传统IPCC的排放源清单相结合的方案，为城市区域碳源解析提供新的拆分方案. |
| 英文摘要 |
| Observations of urban atmospheric CO2 molar fraction and its 13 C isotope composition (δ13 C) is of great importance to interpret the effect of anthropogenic and biologic sources on local or regional carbon cycle. High-frequency in-situ observation on atmospheric in urban airsheds was performed during Youth Olympic Games (YOG) in Nanjing. The hourly, diurnal and daily differences of CO2 concentration and its δ13 C between the period with and without temporary CO2 emission controls were compared. The results showed that short-term emission reduction measures could cause 21×10-6 decrease in atmospheric CO2 concentration in a regional and short-term scale. The reduction of coal combustion during YOG in YRD was about 5%. The overall isotopic signature of local surface sources δ13 CS in Yangtze River Delta (YRD) was determined by Miller-Tans, and the isotopic signatures of anthropogenic and natural sources in YRD were also determined based on literature investigation. According to the above results, the surface net CO2 flux, plant flux and anthropogenic flux in YRD were quantified using mass-balance equation. The CO2 emission from cement production (non-energy industrial process) was the key human factor of high atmospheric δ13 C of CO2 in YRD during summer (2.36‰). The plant effect could offset 23% to 39% anthropogenic CO2 emission in YRD during summer. In this study, we tried to provide new solution to partition carbon sources in urban areas by combining top-down atmospheric observation and traditional IPCC's emission inventory. |
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