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  • 标题:Regional non-CO 2 greenhouse gas fluxes inferred from atmospheric measurements in Ontario, Canada
  • 本地全文:下载
  • 作者:F.R. Vogel ; M. Ishizawa ; E. Chan
  • 期刊名称:Journal of Integrative Environmental Sciences
  • 印刷版ISSN:1943-815X
  • 电子版ISSN:1943-8168
  • 出版年度:2012
  • 卷号:9
  • 期号:Supp 1
  • 页码:41-55
  • DOI:10.1080/1943815X.2012.691884
  • 出版社:Taylor & Francis
  • 摘要:Abstract Independent verification of bottom-up greenhouse gas (GHG) emission inventories is crucial for a reliable reporting of Kyoto gases to the United Nations Framework Convention on Climate Change. Here, we use a pseudo-data experiment to test if our improved version of the well-known Radon tracer method (RTM) is able to quantitatively retrieve regional GHG fluxes. Using in-situ observations in Egbert, Canada, from 2006 to 2009 for the RTM, we derive night-time fluxes of CH 4 and N 2 O in southern Ontario. The N 2 O fluxes found have a inter-quartile range of 7.6–31.2 μgN 2 O/(m 2 h) with an overall mean of 24.4 ± 5.6 μgN 2 O/(m 2 h). Comparison with the EDGAR4.1 inventory revealed an underestimation by a factor of 1.7 ± 0.4 in the inventory, which is explainable by missing natural sources and a missing seasonal cycle in the inventory. Our RTM-based fluxes of CH 4 with a inter-quartiles range of 0.19–0.49 mgCH 4 /(m 2 h) and a mean of 0.36 ± 0.08 mgCH 4 /(m 2 h) lie significantly below the inventory-based estimates of 0.79 ± 0.06 mgCH 4 /(m 2 h). Using a Stochastic Time-Inverted Lagrangian Transport (STILT) model this difference can be attributed to an overestimation of CH 4 emissions in a specific region, the highly urbanized Greater Toronto Area. This study displays how the application of the RTM in future monitoring networks could help to assess high-resolution emission inventories.
  • 关键词:non-CO2 greenhouse gases; regional flux estimate; Radon; top-down; urban emissions
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