气候变化领域集成服务门户(CCPortal): Modelling the impacts of iodine chemistry on the northern Indian Ocean marine boundary layer

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DOI	10.5194/acp-21-8437-2021
	Modelling the impacts of iodine chemistry on the northern Indian Ocean marine boundary layer
	Mahajan A.S.; Li Q.; Inamdar S.; Ram K.; Badia A.; Saiz-Lopez A.
发表日期	2021
ISSN	1680-7316
起始页码	8437
结束页码	8454
卷号	21 期号:11
英文摘要	Recent observations have shown the ubiquitous presence of iodine oxide (IO) in the Indian Ocean marine boundary layer (MBL). In this study, we use the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem version 3.7.1), including halogen (Br, Cl, and I) sources and chemistry, to quantify the impacts of the observed levels of iodine on the chemical composition of the MBL. The model results show that emissions of inorganic iodine species resulting from the deposition of ozone (span classCombining double low line"inline-formula"O3/span) on the sea surface are needed to reproduce the observed levels of IO, although the current parameterizations overestimate the atmospheric concentrations. After reducing the inorganic emissions by 40 %, a reasonable match with cruise-based observations is found, with the model predicting values between 0.1 and 1.2 span classCombining double low line"inline-formula"pptv/span across the model domain MBL. A strong seasonal variation is also observed, with lower iodine concentrations predicted during the monsoon period, when clean oceanic air advects towards the Indian subcontinent, and higher iodine concentrations predicted during the winter period, when polluted air from the Indian subcontinent increases the ozone concentrations in the remote MBL. The results show that significant changes are caused by the inclusion of iodine chemistry, with iodine-catalysed reactions leading to regional changes of up to 25 % in span classCombining double low line"inline-formula"O3/span, 50 % in nitrogen oxides (NO and span classCombining double low line"inline-formula"NO2/span), 15 % in hydroxyl radicals (OH), 25 % in hydroperoxyl radicals (span classCombining double low line"inline-formula"HO2/span), and up to a 50 % change in the nitrate radical (span classCombining double low line"inline-formula"NO3/span), with lower mean values across the domain. Most of the large relative changes are observed in the open-ocean MBL, although iodine chemistry also affects the chemical composition in the coastal environment and over the Indian subcontinent. These results show the importance of including iodine chemistry in modelling the atmosphere in this region./ © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	atmospheric chemistry; atmospheric modeling; boundary layer; chemical composition; concentration (composition); iodine; marine atmosphere; nitrogen oxides; quantitative analysis; seasonal variation; Indian Ocean; Indian Ocean (North)
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/246841
作者单位	Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune411008, India; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, 28006, Spain; Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi, 221g005, India; Institute of Environmental Science and Technology (ICTA), Universitat Autònoma de Barcelona (UAB), Barcelona, Spain
推荐引用方式 GB/T 7714	Mahajan A.S.,Li Q.,Inamdar S.,et al. Modelling the impacts of iodine chemistry on the northern Indian Ocean marine boundary layer[J],2021,21(11).
APA	Mahajan A.S.,Li Q.,Inamdar S.,Ram K.,Badia A.,&Saiz-Lopez A..(2021).Modelling the impacts of iodine chemistry on the northern Indian Ocean marine boundary layer.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Mahajan A.S.,et al."Modelling the impacts of iodine chemistry on the northern Indian Ocean marine boundary layer".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).