气候变化领域集成服务门户(CCPortal): Regional Characteristics of Atmospheric Sulfate Formation in East Antarctica Imprinted on 17O-Excess Signature

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DOI	10.1029/2020JD033583
	Regional Characteristics of Atmospheric Sulfate Formation in East Antarctica Imprinted on 17O-Excess Signature
	Ishino S.; Hattori S.; Legrand M.; Chen Q.; Alexander B.; Shao J.; Huang J.; Jaeglé L.; Jourdain B.; Preunkert S.; Yamada A.; Yoshida N.; Savarino J.
发表日期	2021
ISSN	2169897X
卷号	126 期号:6
英文摘要	17O-excess (Δ17O = δ17O − 0.52 × δ18O) of sulfate trapped in Antarctic ice cores has been proposed as a potential tool for assessing past oxidant chemistry, while insufficient understanding of atmospheric sulfate formation around Antarctica hampers its interpretation. To probe influences of regional specific chemistry, we compared year-round observations of Δ17O of non-sea-salt sulfate in aerosols (Δ17O(SO42−)nss) at Dome C and Dumont d'Urville, inland and coastal sites in East Antarctica, throughout the year 2011. Although Δ17O(SO42−)nss at both sites showed consistent seasonality with summer minima (∼1.0‰) and winter maxima (∼2.5‰) owing to sunlight-driven changes in the relative importance of O3 oxidation to OH and H2O2 oxidation, significant intersite differences were observed in austral spring–summer and autumn. The cooccurrence of higher Δ17O(SO42−)nss at inland (2.0‰ ± 0.1‰) than the coastal site (1.2‰ ± 0.1‰) and chemical destruction of methanesulfonate (MS–) in aerosols at inland during spring–summer (October–December), combined with the first estimated Δ17O(MS–) of ∼16‰, implies that MS– destruction produces sulfate with high Δ17O(SO42−)nss of ∼12‰. If contributing to the known postdepositional decrease of MS– in snow, this process should also cause a significant postdepositional increase in Δ17O(SO42−)nss over 1‰, that can reconcile the discrepancy between Δ17O(SO42−)nss in the atmosphere and ice. The higher Δ17O(SO42−)nss at the coastal site than inland during autumn (March–May) may be associated with oxidation process involving reactive bromine and/or sea-salt particles around the coastal region. © 2021. The Authors.
英文关键词	aerosols; Antarctica; isotope; methanesulfonate; sulfate
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185387
作者单位	Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Yokohama, Japan; National Institute of Polar Research, Research Organization of Information and Systems, Tokyo, Japan; Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, Institut des Géosciences de l'Environnement (IGE), Grenoble, France; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; College of Flight Technology, Civil Aviation University of China, Tianjin, China; Toshima Electric Ltd., Tokyo, Japan; Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, Japan
推荐引用方式 GB/T 7714	Ishino S.,Hattori S.,Legrand M.,et al. Regional Characteristics of Atmospheric Sulfate Formation in East Antarctica Imprinted on 17O-Excess Signature[J],2021,126(6).
APA	Ishino S..,Hattori S..,Legrand M..,Chen Q..,Alexander B..,...&Savarino J..(2021).Regional Characteristics of Atmospheric Sulfate Formation in East Antarctica Imprinted on 17O-Excess Signature.Journal of Geophysical Research: Atmospheres,126(6).
MLA	Ishino S.,et al."Regional Characteristics of Atmospheric Sulfate Formation in East Antarctica Imprinted on 17O-Excess Signature".Journal of Geophysical Research: Atmospheres 126.6(2021).