气候变化领域集成服务门户(CCPortal): H2 in Antarctic firn air: Atmospheric reconstructions and implications for anthropogenic emissions

CCPortal

DOI	10.1073/pnas.2103335118
	H2 in Antarctic firn air: Atmospheric reconstructions and implications for anthropogenic emissions
	Patterson J.D.; Aydin M.; Crotwell A.M.; Pétron G.; Severinghaus J.P.; Krummel P.B.; Langenfelds R.L.; Saltzman E.S.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:36
英文摘要	The atmospheric history of molecular hydrogen (H2) from 1852 to 2003 was reconstructed from measurements of firn air collected at Megadunes, Antarctica. The reconstruction shows that H2 levels in the southern hemisphere were roughly constant near 330 parts per billion (ppb; nmol H2 mol-1 air) during the mid to late 1800s. Over the twentieth century, H2 levels rose by about 70% to 550 ppb. The reconstruction shows good agreement with the H2 atmospheric history based on firn air measurements from the South Pole. The broad trends in atmospheric H2 over the twentieth century can be explained by increased methane oxidation and anthropogenic emissions. The H2 rise shows no evidence of deceleration during the last quarter of the twentieth century despite an expected reduction in automotive emissions following more stringent regulations. During the late twentieth century, atmospheric CO levels decreased due to a reduction in automotive emissions. It is surprising that atmospheric H2 did not respond similarly as automotive exhaust is thought to be the dominant source of anthropogenic H2. The monotonic late twentieth century rise in H2 levels is consistent with late twentieth-century flask air measurements from high southern latitudes. An additional unknown source of H2 is needed to explain twentieth-century trends in atmospheric H2 and to resolve the discrepancy between bottom-up and top-down estimates of the anthropogenic source term. The firn air-based atmospheric history of H2 provides a baseline from which to assess human impact on the H2 cycle over the last 150 y and validate models that will be used to project future trends in atmospheric composition as H2 becomes a more common energy source. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Antarctica; Atmospheric hydrogen; Firn air; H2 emissions
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238407
作者单位	Department of Earth System Science, University of California, Irvine, CA 92697, United States; Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States; Scripps Institution of Oceanography, University of California San Diego, San diego, CA 92037, United States; Oceans and Atmosphere, Climate Science Centre, Commonwealth Scientific and Industrial Research Organisation, Aspendale, VIC 3195, Australia; Department of Chemistry, University of California, Irvine, CA 92697, United States
推荐引用方式 GB/T 7714	Patterson J.D.,Aydin M.,Crotwell A.M.,et al. H2 in Antarctic firn air: Atmospheric reconstructions and implications for anthropogenic emissions[J],2021,118(36).
APA	Patterson J.D..,Aydin M..,Crotwell A.M..,Pétron G..,Severinghaus J.P..,...&Saltzman E.S..(2021).H2 in Antarctic firn air: Atmospheric reconstructions and implications for anthropogenic emissions.Proceedings of the National Academy of Sciences of the United States of America,118(36).
MLA	Patterson J.D.,et al."H2 in Antarctic firn air: Atmospheric reconstructions and implications for anthropogenic emissions".Proceedings of the National Academy of Sciences of the United States of America 118.36(2021).