CO2 flux emissions from the Earth's most actively degassing volcanoes, 2005-2015
CO2 flux emissions from the Earth's most actively degassing volcanoes, 2005-2015
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DOI：
10.1038/s41598-019-41901-y
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发表时间：
2019-04-01
影响因子：
4.6
通讯作者：
Bani, Philipson
中科院分区：
文献类型：
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作者：
Aiuppa, Alessandro;Fischer, Tobias P.;Bani, Philipson
来自地下火山的全球二氧化碳(CO2)通量仍然没有得到很好的量化，限制了我们对地质时代和现代地球深层碳循环的理解。过去推断全球火山二氧化碳通量的尝试由于相对较少的可进入火山的观测结果而有所偏差。在这里，我们提出，可以利用火山气体的二氧化碳/S-T比值与全岩微量元素组成(例如，BA/La)之间的区域/全球关系来预测全球几座偏远脱气火山的强劲但尚未测量的二氧化碳排放量。根据这些全球联系的气体/岩石组成，我们预测了34个没有可用气体测量的顶部脱气偏远火山的CO_2/S T气体比率。通过对来自全球目录的火山SO2通量进行标度，我们估计累积的“未测”二氧化碳排放量为11.4+/-1.1百万吨/年(或0.26+/-0.02.10(12)摩尔/年)。结合27.4+/-3.6 Mt/Yr(或0.62+/-0.08.10(12)Mol/Yr)的测量结果，我们的结果将地球上91座最活跃的空中火山的时间平均(2005-2015)累积CO2通量限制在38.7+/-2.9 Mt/Yr(或0.88+/-0.06.10(12)Mol/Yr)。
The global carbon dioxide (CO2) flux from subaerial volcanoes remains poorly quantified, limiting our understanding of the deep carbon cycle during geologic time and in modern Earth. Past attempts to extrapolate the global volcanic CO2 flux have been biased by observations being available for a relatively small number of accessible volcanoes. Here, we propose that the strong, but yet unmeasured, CO2 emissions from several remote degassing volcanoes worldwide can be predicted using regional/global relationships between the CO2/S-T ratio of volcanic gases and whole-rock trace element compositions (e.g., Ba/La). From these globally linked gas/rock compositions, we predict the CO2/S T gas ratio of 34 top-degassing remote volcanoes with no available gas measurements. By scaling to volcanic SO2 fluxes from a global catalogue, we estimate a cumulative "unmeasured" CO2 output of 11.4 +/- 1.1 Mt/ yr (or 0.26 +/- 0.02.10(12) mol/yr). In combination with the measured CO2 output of 27.4 +/- 3.6 Mt/yr (or 0.62 +/- 0.08.10(12) mol/yr), our results constrain the time-averaged (2005-2015) cumulative CO2 flux from the Earth's 91 most actively degassing subaerial volcanoes at 38.7 +/- 2.9 Mt/yr (or 0.88 +/- 0.06.10(12) mol/yr).