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：2010
卷号：7
期号：Supp 1
页码：97-107
DOI：10.1080/19438151003680843
出版社：Taylor & Francis
摘要：Abstract The doubling of atmospheric methane (CH 4 ) during the twentieth century due largely to growth in anthropogenic emissions has made CH 4 the second largest contributor behind carbon dioxide to anthropogenic forcing of climate change. However, the global CH 4 budget and its decadal evolution remain poorly quantified despite re-evaluations that include the IPCC Fourth Assessment Report. Potentially, the aggregation of national anthropogenic emission inventories as reported to the United Nations Framework Convention on Climate Change could document the changing anthropogenic emission since 1990, as could other “bottom–up” inventories such as EDGAR. As an examination of the recent CH 4 budget evolution, we compare two constructions of CH 4 source history, one based on an aggregation of national emission inventories, the other version 4 of EDGAR, each in combination with alternative natural CH 4 emissions, for consistency with observed atmospheric mixing ratio and carbon isotope content (δ 13 C(CH 4 )). We conclude that despite the utility of isotopic constraints on budget evolution, the level of uncertainty in sink strengths and their isotopic fractionation limits the confidence in constructing anthropogenic emission histories over recent decades.
关键词：methane; carbon-13; national emission inventories; global budget
