Constraining the atmospheric OCS budget from sulfur isotopes
Constraining the atmospheric OCS budget from sulfur isotopes
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限制硫同位素的大气 OCS 预算
DOI：
10.1073/pnas.2007260117
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yoshida Naohiro
中科院分区：
文献类型：
--
作者：
Hattori Shohei;Kamezaki Kazuki;Yoshida Naohiro
羰基硫化物(OCS)是大气中含量最丰富的含硫气体，被用作估算光合作用速率的指标。然而，已经推断出大气OCS的一个大的缺失源。接触网硫同位素测量(34S/32S比值和δ34S)是区分海洋和人为排放的可行工具。这里我们给出了日本境内接触网密度的纬向(南北)观测.观测到的9.7~14.5‰的接触网S反映了源和汇效应。特别是在冬季，接触网的INS值在纬度上的降低与接触网浓度的增加有关，因此在基林样地方法中截距为4.70.8‰。这一结果表明，亚洲季风的流出将人为OCS排放从亚洲大陆输送到西太平洋。东亚地区有组织机构的估计背景与以色列和加那利群岛以前报告的有组织机构的背景一致，这表明北半球有组织机构的背景在12.0至13.5‰之间。我们构建的OCS硫同位素质量平衡表明，人为来源，而不仅仅是海洋来源，占大气OCS缺失来源的很大一部分。
Carbonyl sulfide (OCS), the most abundant sulfur-containing gas in the atmosphere, is used as a proxy for photosynthesis rate estimation. However, a large missing source of atmospheric OCS has been inferred. Sulfur isotope measurements (34S/32S ratio andδ34S) on OCS are a feasible tool to distinguish OCS sources from oceanic and anthropogenic emissions. Here we present the latitudinal (north–south) observations of OCS concentration andS within Japan. The observedS of OCS of 9.7 to 14.5‰ reflects source and sink effects. Particularly in winter, latitudinal decreases inS values of OCS were found to be correlated with increases in OCS concentrations, resulting an intercept of (4.70.8)‰ in the Keeling plot approach. This result implies the transport of anthropogenic OCS emissions from the Asian continent to the western Pacific by the Asian monsoon outflow. The estimated backgroundS of OCS in eastern Asia is consistent with theS of OCS previously reported in Israel and the Canary Islands, suggesting that the backgroundS of OCS in the Northern Hemisphere ranges from 12.0 to 13.5‰. Our constructed sulfur isotopic mass balance of OCS revealed that anthropogenic sources, not merely oceanic sources, account for much of the missing source of atmospheric OCS.
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