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DOI | 10.1073/pnas.1702803114 |
Active molecular iodine photochemistry in the Arctic | |
Raso, Angela R. W.1,2; Custard, Kyle D.1; May, Nathaniel W.2; Tanner, David3; Newburn, Matt K.4; Walker, Lawrence4; Moore, Ronald J.4; Huey, L. G.3; Alexander, Liz4; Shepson, Paul B.1,5,6; Pratt, Kerri A.2,7 | |
2017-09-19 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:38页码:10053-10058 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | During springtime, the Arctic atmospheric boundary layer undergoes frequent rapid depletions in ozone and gaseous elemental mercury due to reactions with halogen atoms, influencing atmospheric composition and pollutant fate. Although bromine chemistry has been shown to initiate ozone depletion events, and it has long been hypothesized that iodine chemistry may contribute, no previous measurements of molecular iodine (I-2) have been reported in the Arctic. Iodine chemistry also contributes to atmospheric new particle formation and therefore cloud properties and radiative forcing. Here we present Arctic atmospheric I-2 and snowpack iodide (I-) measurements, which were conducted near Utqiagvik, AK, in February 2014. Using chemical ionization mass spectrometry, I-2 was observed in the atmosphere at mole ratios of 0.3-1.0 ppt, and in the snowpack interstitial air at mole ratios up to 22 ppt under natural sunlit conditions and up to 35 ppt when the snowpack surface was artificially irradiated, suggesting a photochemical production mechanism. Further, snow meltwater I- measurements showed enrichments of up to similar to 1,900 times above the seawater ratio of I-/Na+, consistent with iodine activation and recycling. Modeling shows that observed I2 levels are able to significantly increase ozone depletion rates, while also producing iodine monoxide (IO) at levels recently observed in the Arctic. These results emphasize the significance of iodine chemistry and the role of snowpack photochemistry in Arctic atmospheric composition, and imply that I-2 is likely a dominant source of iodine atoms in the Arctic. |
英文关键词 | atmosphere iodine cryosphere snowpack photochemistry |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411157100047 |
WOS关键词 | OZONE DEPLETION ; BROMINE ACTIVATION ; BOUNDARY-LAYER ; POLAR SUNRISE ; VERTICAL-DISTRIBUTION ; ATMOSPHERIC IODINE ; PARTICLE FORMATION ; LOWER TROPOSPHERE ; INORGANIC IODINE ; CHEMISTRY |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204785 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA; 2.Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA; 3.Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA; 4.Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA; 5.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA; 6.Purdue Univ, Purdue Climate Change Res Ctr, W Lafayette, IN 47907 USA; 7.Univ Michigan, Dept Earth & Environm Sci, Ann Arbor, MI 48109 USA |
推荐引用方式 GB/T 7714 | Raso, Angela R. W.,Custard, Kyle D.,May, Nathaniel W.,et al. Active molecular iodine photochemistry in the Arctic[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(38):10053-10058. |
APA | Raso, Angela R. W..,Custard, Kyle D..,May, Nathaniel W..,Tanner, David.,Newburn, Matt K..,...&Pratt, Kerri A..(2017).Active molecular iodine photochemistry in the Arctic.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(38),10053-10058. |
MLA | Raso, Angela R. W.,et al."Active molecular iodine photochemistry in the Arctic".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.38(2017):10053-10058. |
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