气候变化领域集成服务门户(CCPortal): Observations of iodine monoxide over three summers at the Indian Antarctic bases of Bharati and Maitri

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DOI	10.5194/acp-21-11829-2021
	Observations of iodine monoxide over three summers at the Indian Antarctic bases of Bharati and Maitri
	Mahajan A.S.; Biswas M.S.; Beirle S.; Wagner T.; Schönhardt A.; Benavent N.; Saiz-Lopez A.
发表日期	2021
ISSN	1680-7316
起始页码	11829
结束页码	11842
卷号	21 期号:15
英文摘要	Iodine plays a vital role in oxidation chemistry over Antarctica, with past observations showing highly elevated levels of iodine oxide (IO) leading to severe depletion of boundary layer ozone in West Antarctica. Here, we present MAX-DOAS-based (multi-axis differential absorption spectroscopy) observations of IO over three summers (2015-2017) at the Indian Antarctic bases of Bharati and Maitri. IO was observed during all the campaigns with mixing ratios below 2ĝ€¯pptv (parts per trillion by volume) for the three summers, which are lower than the peak levels observed in West Antarctica. This suggests that sources in West Antarctica are different or stronger than sources of iodine compounds in East Antarctica, the nature of which is still uncertain. Vertical profiles estimated using a profile retrieval algorithm showed decreasing gradients with a peak in the lower boundary layer. The ground-based instrument retrieved vertical column densities (VCDs) were approximately a factor of 3 to 5 higher than the VCDs reported using satellite-based instruments, which is most likely related to the sensitivities of the measurement techniques. Air mass back-trajectory analysis failed to highlight a source region, with most of the air masses coming from coastal or continental regions. This study highlights the variation in iodine chemistry in different regions in Antarctica and the importance of a long-term dataset to validate models estimating the impacts of iodine chemistry. © Author(s) 2021.
语种	英语
scopus关键词	air mass; algorithm; atmospheric chemistry; atmospheric modeling; ground-based measurement; iodine; model validation; observational method; oxidation; summer; vertical profile; Antarctica; Antarctica; East Antarctica; Maitri
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/246672
作者单位	Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Ministry of Earth Sciences, Pune, 411008, India; Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune, 411008, India; Satellitenfernerkundung, Max-Planck-Institut für Chemie (MPI-C), Mainz, 55128, Germany; Department of Physics and Electrical Engineering, Institute of Environmental Physics, University of Bremen, Bremen, 330440, Germany; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, 28006, Spain
推荐引用方式 GB/T 7714	Mahajan A.S.,Biswas M.S.,Beirle S.,et al. Observations of iodine monoxide over three summers at the Indian Antarctic bases of Bharati and Maitri[J],2021,21(15).
APA	Mahajan A.S..,Biswas M.S..,Beirle S..,Wagner T..,Schönhardt A..,...&Saiz-Lopez A..(2021).Observations of iodine monoxide over three summers at the Indian Antarctic bases of Bharati and Maitri.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(15).
MLA	Mahajan A.S.,et al."Observations of iodine monoxide over three summers at the Indian Antarctic bases of Bharati and Maitri".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.15(2021).