气候变化领域集成服务门户(CCPortal): Direct field evidence of autocatalytic iodine release from atmospheric aerosol

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DOI	10.1073/pnas.2009951118
	Direct field evidence of autocatalytic iodine release from atmospheric aerosol
	Tham Y.J.; He X.-C.; Li Q.; Cuevas C.A.; Shen J.; Kalliokoski J.; Yan C.; Iyer S.; Lehmusjärvi T.; Jang S.; Thakur R.C.; Beck L.; Kemppainen D.; Olin M.; Sarnela N.; Mikkilä J.; Hakala J.; Marbouti M.; Yao L.; Li H.; Huang W.; Wang Y.; Wimmer D.; Zha Q.; Virkanen J.; Gerard Spain T.; O’Doherty S.; Jokinen T.; Bianchi F.; Petäjä T.; Worsnop D.R.; Mauldin R.L.; Ovadnevaite J.; Ceburnis D.; Maier N.M.; Kulmala M.; O’Dowd C.; Maso M.D.; Saiz-Lopez A.; Sipilä M.
发表日期	2021
ISSN	00278424
卷号	118 期号:4
英文摘要	Reactive iodine plays a key role in determining the oxidation capacity, or cleansing capacity, of the atmosphere in addition to being implicated in the formation of new particles in the marine boundary layer. The postulation that heterogeneous cycling of reactive iodine on aerosols may significantly influence the lifetime of ozone in the troposphere not only remains poorly understood but also heretofore has never been observed or quantified in the field. Here, we report direct ambient observations of hypoiodous acid (HOI) and heterogeneous recycling of interhalogen product species (i.e., iodine monochloride [ICl] and iodine monobromide [IBr]) in a midlatitude coastal environment. Significant levels of ICl and IBr with mean daily maxima of 4.3 and 3.0 parts per trillion by volume (1-min average), respectively, have been observed throughout the campaign. We show that the heterogeneous reaction of HOI on marine aerosol and subsequent production of iodine interhalogens are much faster than previously thought. These results indicate that the fast formation of iodine interhalogens, together with their rapid photolysis, results in more efficient recycling of atomic iodine than currently considered in models. Photolysis of the observed ICl and IBr leads to a 32% increase in the daytime average of atomic iodine production rate, thereby enhancing the average daytime iodine-catalyzed ozone loss rate by 10 to 20%. Our findings provide direct field evidence that the autocatalytic mechanism of iodine release from marine aerosol is important in the atmosphere and can have significant impacts on atmospheric oxidation capacity. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Halogen recycling; Heterogeneous reaction; Iodine; Ozone loss
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/180919
作者单位	Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, 00014, Finland; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, 28006, Spain; Aerosol Physics Laboratory, Physics Unit, Tampere University, Tampere, FI-33014, Finland; Division of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, 37673, South Korea; Karsa Ltd., Helsinki, 00560, Finland; Department of Geosciences and Geography, University of Helsinki, Helsinki, 00560, Finland; School of Physics, National University of Ireland Galway, Galway, H91 CF50, Ireland; Ryan Institute’s Centre for Climate & Air Pollution Studies, National University of Ireland Galway, Galway, H91 CF50, Ireland; Marine Renewable Energy Ireland, National University of Ireland Galway, Galway, H91 CF50, Ireland; School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom; Aerodyne Research Inc., Billerica, M...
推荐引用方式 GB/T 7714	Tham Y.J.,He X.-C.,Li Q.,et al. Direct field evidence of autocatalytic iodine release from atmospheric aerosol[J],2021,118(4).
APA	Tham Y.J..,He X.-C..,Li Q..,Cuevas C.A..,Shen J..,...&Sipilä M..(2021).Direct field evidence of autocatalytic iodine release from atmospheric aerosol.Proceedings of the National Academy of Sciences of the United States of America,118(4).
MLA	Tham Y.J.,et al."Direct field evidence of autocatalytic iodine release from atmospheric aerosol".Proceedings of the National Academy of Sciences of the United States of America 118.4(2021).