Isotopic Ratios of Tropical Methane Emissions by Atmospheric Measurement
Isotopic Ratios of Tropical Methane Emissions by Atmospheric Measurement
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DOI：
10.1002/2017gb005689
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发表时间：
2017-09-01
影响因子：
5.2
通讯作者：
Nisbet, E. G.
中科院分区：
文献类型：
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作者：
Brownlow, R.;Lowry, D.;Nisbet, E. G.
热带甲烷来源是全球甲烷预算的重要组成部分，包括自然湿地、水稻农业、生物质燃烧、反刍动物、化石燃料和废物。 delta C-13(CH4) 可以对甲烷源分配提供强有力的约束。例如，本研究中的热带湿地给出的 Delta C-13(CH4) 值介于 -61.5 +/- 2.9% 和 -53.0 +/- 0.4% 之间，并且总体上比温带和北方湿地的 C-13 含量更高。然而，迄今为止，在热带地区对富含甲烷的空气中的 delta C-13(CH4) 进行的测量相对较少。在这项研究中，样本是从热带湿地、水稻、反刍动物和生物质燃烧排放到大气中的排放物中收集的。由于不同的过程和来源材料影响甲烷特征，区域同位素特征差异很大。进行测量是为了确定大气中的大量源输入，而不是研究单个过程。这些测量结果为区域甲烷预算模型提供输入，以更好地分配源来限制排放。 通俗易懂的语言摘要 热带甲烷来源是全球甲烷预算的重要组成部分，包括自然湿地、水稻农业、生物质燃烧、反刍动物、化石燃料和废物。甲烷中的碳同位素可以对甲烷来源分配提供强有力的约束。然而，迄今为止，在热带地区对富含甲烷的空气中的碳同位素进行的测量相对较少。在这项研究中，样本是从热带湿地、水稻、反刍动物和生物质燃烧排放到大气中的排放物中收集的。由于不同的过程和来源材料影响甲烷特征，区域同位素特征差异很大。进行测量是为了确定大气中的大量源输入，而不是研究单个过程，为区域甲烷预算模型提供输入，并通过更好的源分配来限制排放。
Tropical methane sources are an important part of the global methane budget and include natural wetlands, rice agriculture, biomass burning, ruminants, fossil fuels, and waste. delta C-13(CH4) can provide strong constraints on methane source apportionment. For example, tropical wetlands in this study give delta C-13(CH4) values between -61.5 +/- 2.9% and -53.0 +/- 0.4% and in general are more enriched in C-13 than temperate and boreal wetlands. However, thus far, relatively few measurements of delta C-13(CH4) in methane-enriched air have been made in the tropics. In this study samples have been collected from tropical wetland, rice, ruminant, and biomass burning emissions to the atmosphere. Regional isotopic signatures vary greatly as different processes and source material affect methane signatures. Measurements were made to determine bulk source inputs to the atmosphere, rather than to study individual processes. These measurements provide inputs for regional methane budget models, to constrain emissions with better source apportionment.Plain Language Summary Tropical methane sources are an important part of the global methane budget and include natural wetlands, rice agriculture, biomass burning, ruminants, fossil fuels, and waste. Carbon isotopes in methane can provide strong constraints on methane source apportionment. However, thus far, relatively few measurements of carbon isotopes in methane-enriched air have been made in the tropics. In this study samples have been collected from tropical wetland, rice, ruminant, and biomass burning emissions to atmosphere. Regional isotopic signatures vary greatly as different processes and source material affect methane signatures. Measurements were made to determine bulk source inputs to the atmosphere, rather than to study individual processes, to provide inputs for regional methane budget models, and to constrain emissions with better source apportionment.