Isotopic signatures of methane emissions from tropical fires, agriculture and wetlands: the MOYA and ZWAMPS flights.
Isotopic signatures of methane emissions from tropical fires, agriculture and wetlands: the MOYA and ZWAMPS flights.
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DOI：
10.1098/rsta.2021.0112
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发表时间：
2022-01-24
期刊：
影响因子：
--
通讯作者：
E Wilde S
中科院分区：
文献类型：
--
作者：
MOYA/ZWAMPS Team;Nisbet EG;Allen G;Fisher RE;France JL;Lee JD;Lowry D;Andrade MF;Bannan TJ;Barker P;Bateson P;Bauguitte SJ;Bower KN;Broderick TJ;Chibesakunda F;Cain M;Cozens AE;Daly MC;Ganesan AL;Jones AE;Lambakasa M;Lunt MF;Mehra A;Moreno I;Pasternak D;Palmer PI;Percival CJ;Pitt JR;Riddle AJ;Rigby M;Shaw JT;Stell AC;Vaughan AR;Warwick NJ;E Wilde S
我们报告了来自非洲和南美洲的飞机和地面测量的甲烷同位素数据。飞机活动在尼罗河、刚果和赞比西盆地的热带纸莎草类湿地、玻利维亚南部亚马逊河的草本湿地以及非洲林地、农田和大草原的大火上采集了很强的甲烷通量。赤道尼罗河湿地和农业区的甲烷δ13CCH4同位素特征在−55到−49‰范围内，而上刚果和赞比西湿地的甲烷排放在−60 ± 1‰范围内。在玻利维亚东北部的亚马逊湿地(约−59‰)上测量到了非常相似的δ13CCH4签名，从上刚果南部外部热带湿地和上亚马逊流域绘制的总体−13CCH4签名为−59 ± 2‰。这些结果比预期的更负面。对于非洲牛，δ13CCH4值在−60到−50‰之间。热带大火排放的甲烷中的同位素比率取决于生物质燃料的C3、 ： 、C4比率。在塞内加尔热带C3干燥森林火灾产生的烟雾中，δ13CCH4值约为−28‰。相比之下，非洲C4热带草火的δ13CCH4值为−16至−12‰。来自赞比亚和津巴布韦城市垃圾填埋场的甲烷，这两个国家经常发生垃圾火灾，其δ13CCH4约为−37到−36‰。这些新的同位素值有助于改善对全球甲烷收支模型的同位素约束，因为全球大气模型预测的大气δ13CCH4值对应用于热带湿地排放的δ13CCH4同位素特征高度敏感。实地和飞机运动还观察到非洲在雨季和旱季都有广泛的区域烟雾污染，以及大量的城市污染羽流。这项工作突出了了解热带温室气体排放的必要性，以实现《联合国气候变化框架公约巴黎协定》的目标，并帮助减少非洲广大地区的空气污染。本文是讨论会议议题《甲烷上升：变暖喂食变暖吗？(第二部分)》的一部分。
We report methane isotopologue data from aircraft and ground measurements in Africa and South America. Aircraft campaigns sampled strong methane fluxes over tropical papyrus wetlands in the Nile, Congo and Zambezi basins, herbaceous wetlands in Bolivian southern Amazonia, and over fires in African woodland, cropland and savannah grassland. Measured methane δ13CCH4 isotopic signatures were in the range −55 to −49‰ for emissions from equatorial Nile wetlands and agricultural areas, but widely −60 ± 1‰ from Upper Congo and Zambezi wetlands. Very similar δ13CCH4 signatures were measured over the Amazonian wetlands of NE Bolivia (around −59‰) and the overall δ13CCH4 signature from outer tropical wetlands in the southern Upper Congo and Upper Amazon drainage plotted together was −59 ± 2‰. These results were more negative than expected. For African cattle, δ13CCH4 values were around −60 to −50‰. Isotopic ratios in methane emitted by tropical fires depended on the C3 : C4 ratio of the biomass fuel. In smoke from tropical C3 dry forest fires in Senegal, δ13CCH4 values were around −28‰. By contrast, African C4 tropical grass fire δ13CCH4 values were −16 to −12‰. Methane from urban landfills in Zambia and Zimbabwe, which have frequent waste fires, had δ13CCH4 around −37 to −36‰. These new isotopic values help improve isotopic constraints on global methane budget models because atmospheric δ13CCH4 values predicted by global atmospheric models are highly sensitive to the δ13CCH4 isotopic signatures applied to tropical wetland emissions. Field and aircraft campaigns also observed widespread regional smoke pollution over Africa, in both the wet and dry seasons, and large urban pollution plumes. The work highlights the need to understand tropical greenhouse gas emissions in order to meet the goals of the UNFCCC Paris Agreement, and to help reduce air pollution over wide regions of Africa. This article is part of a discussion meeting issue 'Rising methane: is warming feeding warming? (part 2)'.
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DOI：
10.1016/s0031-0182(01)00358-3
发表时间：
2002-01-05
影响因子：
3
作者：
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0.9
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DOI：
10.1098/rsta.2020.0440
发表时间：
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期刊：
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
影响因子：
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作者：
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DOI：
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发表时间：
2017-01-01
期刊：
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影响因子：
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