气候变化领域集成服务门户(CCPortal): Exploring the inorganic composition of the Asian Tropopause Aerosol Layer using medium-duration balloon flights

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DOI	10.5194/acp-22-12675-2022
	Exploring the inorganic composition of the Asian Tropopause Aerosol Layer using medium-duration balloon flights
	Vernier, Hazel; Rastogi, Neeraj; Liu, Hongyu; Pandit, Amit Kumar; Bedka, Kris; Patel, Anil; Ratnam, Madineni Venkat; Kumar, Buduru Suneel; Zhang, Bo; Gadhavi, Harish; Wienhold, Frank; Berthet, Gwenael; Vernier, Jean-Paul
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12675
结束页码	12694
卷号	22 期号:18 页码:20
英文摘要	Satellite observations have revealed an enhanced aerosol layer near the tropopause over Asia during the summer monsoon, called the Asian Tropopause Aerosol Layer (ATAL). In this work, aerosol particles in the ATAL were collected with a balloon-borne impactor near the tropopause region over India, using extended-duration balloon flights, in summer 2017 and winter 2018. The chemical composition of these particles was further investigated by quantitative analysis using offline ion chromatography. Nitrate (NO3-) and nitrite (NO2-) were found to be the dominant ions in the collected aerosols with values ranging between 87 and 343 ng M-3 at STP (standard temperature and pressure) during the summer campaign. In contrast, sulfate (SO42-) levels were found to be above the detection limit (> 10 ng m(-3) at STP) only in winter. In addition, we determined the origin of the air masses sampled during the flights using the analysis of back trajectories as well as a convective proxy from cloud-top temperature fields derived from a geostationary satellite. The results obtained from this analysis were put into the context of large-scale transport and aerosol distribution using GEOS-Chem chemical transport model simulations. The first flight in summer 2017 which sampled an air mass within the Asian monsoon anticyclone (AMA), influenced by convection over Western China, was associated with particle size diameters from 0.05 to 0.15 pm. In contrast, the second flight sampled air masses at the edge of the AMA associated with a larger particle size radius (> 2 mu m) with a higher NO2- concentration. The sampled air masses in winter 2018 were likely affected by smoke from the Pacific Northwest fire event in Canada, which occurred 7 months before our campaign, associated with concentration enhancements of SO42- and Ca2+. Overall, our results suggest that nitrogen-containing particles represent a large fraction of cloud-free and in-cloud aerosols populating the ATAL, which is partially in agreement with the results from aircraft measurements during the StratoClim (Stratospheric and upper tropospheric processes for better climate predictions) campaign. The exact nature of those particles is still unknown, but their coincidences with subvisible cirrus clouds and their sizes suggest nitric acid trihydrate (NAT) as a possible candidate, as NAT has already been observed in the tropical upper troposphere and lower stratosphere in other studies. Furthermore, GEOS-Chem model simulations indicate that lightning NOx emissions could have significantly impacted the production of nitrate aerosols sampled during the summer of 2017.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000861375100001
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/273455
作者单位	Centre National de la Recherche Scientifique (CNRS); Universite de Orleans; Department of Space (DoS), Government of India; Physical Research Laboratory - India; National Institute for Aerospace; National Aeronautics & Space Administration (NASA); NASA Langley Research Center; Department of Space (DoS), Government of India; National Atmospheric Research Laboratory (NARL); Swiss Federal Institutes of Technology Domain; ETH Zurich
推荐引用方式 GB/T 7714	Vernier, Hazel,Rastogi, Neeraj,Liu, Hongyu,et al. Exploring the inorganic composition of the Asian Tropopause Aerosol Layer using medium-duration balloon flights[J],2022,22(18):20.
APA	Vernier, Hazel.,Rastogi, Neeraj.,Liu, Hongyu.,Pandit, Amit Kumar.,Bedka, Kris.,...&Vernier, Jean-Paul.(2022).Exploring the inorganic composition of the Asian Tropopause Aerosol Layer using medium-duration balloon flights.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(18),20.
MLA	Vernier, Hazel,et al."Exploring the inorganic composition of the Asian Tropopause Aerosol Layer using medium-duration balloon flights".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.18(2022):20.