Rapid increase in dichloromethane emissions from China inferred through atmospheric observations.

Rapid increase in dichloromethane emissions from China inferred through atmospheric observations.
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DOI:
10.1038/s41467-021-27592-y
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发表时间:
2021-12-14
影响因子:
16.6
通讯作者:
Rigby M
Rigby M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
An M;Western LM;Say D;Chen L;Claxton T;Ganesan AL;Hossaini R;Krummel PB;Manning AJ;Mühle J;O'Doherty S;Prinn RG;Weiss RF;Young D;Hu J;Yao B;Rigby M

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随着《关于消耗臭氧层物质的蒙特利尔议定书》的成功实施,大气中消耗臭氧层物质的丰度继续缓慢减少,南极臭氧空洞正在出现恢复的迹象。然而,不受管制的短寿命人为氯氟化碳的排放量不断增加,抵消了其中的一些收益。在这里,我们报告了中国工业生产的氯碳,二氯甲烷(CH 2Cl 2)的排放量增加。排放量从2011年的231(213-245)千兆克/年增长到2019年的628(599-658)千兆克/年,年均增长13(12-15)%,主要来自中国东部。中国CH 2Cl 2排放量的总体增长与同期全球排放量增长354(281 - 427)Gg yr-1的幅度相同。如果全球CH 2Cl 2排放量保持在2019年的水平,与没有CH 2Cl 2排放的情况相比,它们可能导致南极臭氧恢复延迟约5年。二氯甲烷(CH 2Cl 2)是一种不受管制的臭氧消耗物质,近年来其排放量大幅增加。在这里,作者表明,2011年至2019年中国二氯甲烷排放量的增加可以解释全球增长的大部分原因。
With the successful implementation of the Montreal Protocol on Substances that Deplete the Ozone Layer, the atmospheric abundance of ozone-depleting substances continues to decrease slowly and the Antarctic ozone hole is showing signs of recovery. However, growing emissions of unregulated short-lived anthropogenic chlorocarbons are offsetting some of these gains. Here, we report an increase in emissions from China of the industrially produced chlorocarbon, dichloromethane (CH2Cl2). The emissions grew from 231 (213–245) Gg yr−1 in 2011 to 628 (599–658) Gg yr−1 in 2019, with an average annual increase of 13 (12–15) %, primarily from eastern China. The overall increase in CH2Cl2 emissions from China has the same magnitude as the global emission rise of 354 (281−427) Gg yr−1 over the same period. If global CH2Cl2 emissions remain at 2019 levels, they could lead to a delay in Antarctic ozone recovery of around 5 years compared to a scenario with no CH2Cl2 emissions. Dichloromethane (CH2Cl2) is an unregulated ozone depleting substance whose emissions have strongly increased in recent years. Here, the authors show that rising emissions of dichloromethane in China between 2011 and 2019 can explain much of this global increase.
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