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DOI	10.5194/acp-20-12093-2020
	Estimation of reactive inorganic iodine fluxes in the Indian and Southern Ocean marine boundary layer
	Inamdar S.; Tinel L.; Chance R.; Carpenter L.J.; Sabu P.; Chacko R.; Tripathy S.C.; Kerkar A.U.; Sinha A.K.; Venkateswaran Bhaskar P.; Sarkar A.; Roy R.; Sherwen T.; Cuevas C.; Saiz-Lopez A.; Ram K.; Mahajan A.S.
发表日期	2020
ISSN	16807316
起始页码	12093
结束页码	12114
卷号	20 期号:20
英文摘要	Iodine chemistry has noteworthy impacts on the oxidising capacity of the marine boundary layer (MBL) through the depletion of ozone (O3) and changes to HOx (OH=HO2) and NOx (NO=NO2) ratios. Hitherto, studies have shown that the reaction of atmospheric O3 with surface seawater iodide (I-) contributes to the flux of iodine species into the MBL mainly as hypoiodous acid (HOI) and molecular iodine (I2). Here, we present the first concomitant observations of iodine oxide (IO), O3 in the gas phase, and sea surface iodide concentrations. The results from three field campaigns in the Indian Ocean and the Southern Ocean during 2015 2017 are used to compute reactive iodine fluxes in the MBL. Observations of atmospheric IO by multi-axis differential optical absorption spectroscopy (MAX-DOAS) show active iodine chemistry in this environment, with IO values up to 1 pptv (parts per trillion by volume) below latitudes of 40° S. In order to compute the sea-to-air iodine flux supporting this chemistry, we compare previously established global sea surface iodide parameterisations with new regionspecific parameterisations based on the new iodide observations. This study shows that regional changes in salinity and sea surface temperature play a role in surface seawater iodide estimation. Sea air fluxes of HOI and I2, calculated from the atmospheric ozone and seawater iodide concentrations (observed and predicted), failed to adequately explain the detected IO in this region. This discrepancy highlights the need to measure direct fluxes of inorganic and organic iodine species in the marine environment. Amongst other potential drivers of reactive iodine chemistry investigated, chlorophyll a showed a significant correlation with atmospheric IO (R D 0:7 above the 99 % significance level) to the north of the polar front. This correlation might be indicative of a biogenic control on iodine sources in this region. © 2020 Author(s).
语种	英语
scopus关键词	atmospheric chemistry; boundary layer; concentration (composition); estimation method; iodine; ozone depletion; sea surface salinity; sea surface temperature; seawater; Indian Ocean; Southern Ocean
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/143882
作者单位	Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Dr Homi Bhabha Road, Pashan, Pune, 411 008, India; Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi, 221 005, India; Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, United Kingdom; National Centre for Polar and Ocean Research, Goa, 403 804, India; Environment and Life Sciences Research Centre, Kuwait Institute for Scientific Research Centre, Al-Jaheth Street, Shuwaikh, 13109, Kuwait; Indian Space Research Organisation, National Remote Sensing Centre, Hyderabad, 500 037, India; National Centre for Atmospheric Science, University of York, York, YO10 5DD, United Kingdom; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain
推荐引用方式 GB/T 7714	Inamdar S.,Tinel L.,Chance R.,et al. Estimation of reactive inorganic iodine fluxes in the Indian and Southern Ocean marine boundary layer[J],2020,20(20).
APA	Inamdar S..,Tinel L..,Chance R..,Carpenter L.J..,Sabu P..,...&Mahajan A.S..(2020).Estimation of reactive inorganic iodine fluxes in the Indian and Southern Ocean marine boundary layer.Atmospheric Chemistry and Physics,20(20).
MLA	Inamdar S.,et al."Estimation of reactive inorganic iodine fluxes in the Indian and Southern Ocean marine boundary layer".Atmospheric Chemistry and Physics 20.20(2020).