气候变化领域集成服务门户(CCPortal): Comparison of inorganic chlorine in the Antarctic and Arctic lowermost stratosphere by separate late winter aircraft measurements

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DOI	10.5194/acp-21-17225-2021
	Comparison of inorganic chlorine in the Antarctic and Arctic lowermost stratosphere by separate late winter aircraft measurements
	Jesswein M.; Bozem H.; Lachnitt H.-C.; Hoor P.; Wagenhäuser T.; Keber T.; Schuck T.; Engel A.
发表日期	2021
ISSN	1680-7316
起始页码	17225
结束页码	17241
卷号	21 期号:23
英文摘要	Stratospheric inorganic chlorine (Cly) is predominantly released from long-lived chlorinated source gases and, to a small extent, very short-lived chlorinated substances. Cly includes the reservoir species (HCl and ClONO2) and active chlorine species (i.e., ClOx). The active chlorine species drive catalytic cycles that deplete ozone in the polar winter stratosphere. This work presents calculations of inorganic chlorine (Cly) derived from chlorinated source gas measurements on board the High Altitude and Long Range Research Aircraft (HALO) during the Southern Hemisphere Transport, Dynamic and Chemistry (SouthTRAC) campaign in austral late winter and early spring 2019. Results are compared to Cly in the Northern Hemisphere derived from measurements of the POLSTRACC-GW-LCYCLE-SALSA (PGS) campaign in the Arctic winter of 2015/2016. A scaled correlation was used for PGS data, since not all source gases were measured. Using the SouthTRAC data, Cly from a scaled correlation was compared to directly determined Cly and agreed well. An air mass classification based on in situ N2O measurements allocates the measurements to the vortex, the vortex boundary region, and midlatitudes. Although the Antarctic vortex was weakened in 2019 compared to previous years, Cly reached 1687±19ĝ€¯ppt at 385ĝ€¯K; therefore, up to around 50ĝ€¯% of total chlorine was found in inorganic form inside the Antarctic vortex, whereas only 15ĝ€¯% of total chlorine was found in inorganic form in the southern midlatitudes. In contrast, only 40ĝ€¯% of total chlorine was found in inorganic form in the Arctic vortex during PGS, and roughly 20ĝ€¯% was found in inorganic form in the northern midlatitudes. Differences inside the two vortices reach as much as 540ĝ€¯ppt, with more Cly in the Antarctic vortex in 2019 than in the Arctic vortex in 2016 (at comparable distance to the local tropopause). To our knowledge, this is the first comparison of inorganic chlorine within the Antarctic and Arctic polar vortices. Based on the results of these two campaigns, the differences in Cly inside the two vortices are substantial and larger than the inter-annual variations previously reported for the Antarctic. © 2021 Markus Jesswein et al.
语种	英语
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246411
作者单位	University of Frankfurt, Institute for Atmospheric and Environmental Sciences, Frankfurt, Germany; Johannes Gutenberg University of Mainz, Institute for Atmospheric Physics, Mainz, Germany
推荐引用方式 GB/T 7714	Jesswein M.,Bozem H.,Lachnitt H.-C.,et al. Comparison of inorganic chlorine in the Antarctic and Arctic lowermost stratosphere by separate late winter aircraft measurements[J],2021,21(23).
APA	Jesswein M..,Bozem H..,Lachnitt H.-C..,Hoor P..,Wagenhäuser T..,...&Engel A..(2021).Comparison of inorganic chlorine in the Antarctic and Arctic lowermost stratosphere by separate late winter aircraft measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(23).
MLA	Jesswein M.,et al."Comparison of inorganic chlorine in the Antarctic and Arctic lowermost stratosphere by separate late winter aircraft measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.23(2021).