气候变化领域集成服务门户(CCPortal): Convective uplift of pollution from the Sichuan Basin into the Asian monsoon anticyclone during the StratoClim aircraft campaign

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DOI	10.5194/acp-21-3255-2021
	Convective uplift of pollution from the Sichuan Basin into the Asian monsoon anticyclone during the StratoClim aircraft campaign
	Lee K.-O.; Barret B.; Flochmoën E.L.; Tulet P.; Bucci S.; Von Hobe M.; Kloss C.; Legras B.; Leriche M.; Sauvage B.; Ravegnani F.; Ulanovsky A.
发表日期	2021
ISSN	1680-7316
起始页码	3255
结束页码	3274
卷号	21 期号:5
英文摘要	The StratoClim airborne campaign took place in Nepal from 27 July to 10 August 2017 to document the physical and chemical properties of the South Asian upper troposphere-lower stratosphere (UTLS) during the Asian summer monsoon (ASM). In the present paper, simulations with the Meso-NH cloud-chemistry model at a horizontal resolution of 15 km are performed over the Asian region to characterize the impact of monsoon deep convection on the composition of Asian monsoon anticyclone (AMA) and on the formation of the Asian tropopause aerosol layer (ATAL) during the StratoClim campaign. StratoClim took place during a break phase of the monsoon with intense convective activity over South China and Sichuan. Comparisons between brightness temperatures (BTs) at 10.8 ìm observed by satellite sensors and simulated by Meso-NH highlight the ability of the model to correctly reproduce the life cycle of deep convective clouds. A comparison between CO and O3 concentrations from Meso-NH and airborne observations (StratoClim and IAGOS (In-service Aircraft for a Global Observing System)) demonstrates that the model captures most of the observed variabilities. Nevertheless, for both gases, the model tends to overestimate the concentrations and misses some thin CO plumes related to local convective events probably because the resolution is too coarse, but the convective uplift of pollution is very well captured by the model. We have therefore focused on the impact of Sichuan convection on the AMA composition. A dedicated sensitivity simulation showed that the 7 August convective event brought large amounts of CO deep into the AMA and even across the 380K isentropic level located at 17.8 km. This Sichuan contribution enhanced the CO concentration by ∼ 15% to reach more than 180 ppbv over a large area around 15 km height. It is noteworthy that Meso-NH captures the impact of the diluted Sichuan plume on the CO concentration during a StratoClim flight south of Kathmandu, highlighting its ability to reproduce the transport pathway of Sichuan pollution. According to the model, primary organic aerosol and black carbon particles originating from Sichuan are transported following the same pathway as CO. The large particles are heavily scavenged within the precipitating part of the convective clouds but remain the most important contributor to the particle mass in the AMA. Over the whole AMA region, the 7 August convective event resulted in a 0.5% increase in CO concentration over the 10-20 km range that lasted about 2 d. The impact of pollution uplift from three regions (India, China, and Sichuan) averaged over the first 10 d of August has also been evaluated with sensitivity simulations. Even during this monsoon break phase, the results confirm the predominant role of India relative to China with respective contributions of 11% and 7% to CO concentration in the 10-15 km layer. Moreover, during this period a large part (35 %) of the Chinese contribution comes from the Sichuan Basin alone. Copyright © 2021 by ASME.
语种	英语
scopus关键词	aerosol; airborne survey; anticyclone; atmospheric pollution; black carbon; brightness temperature; convective cloud; monsoon; Bagmati; China; India; Kathmandu; Nepal; Sichuan Basin
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/247092
作者单位	Laboratoire d'Aérologie, Université de Toulouse, CNRS, UPS, Toulouse, France; Laboratoire de l'Atmosphère et des Cyclones, UMR8105, CNRS, Météo-France, Université de la Réunion, Saint-Denis de La Réunion, France; Laboratoire de Météorologie Dynamique, UMR CNRS 8539, IPSL ENS-PSL, Sorbonne Université, Ecole Polytechnique, Ecole des Ponts Paris Tech, Paris, France; Institute for Energy and Climate Research (IEK-7), Forschungszentrum Jülich GmbH, Jülich, 52425, Germany; LPC2E, CNRS, Université d'Orléans, Orléans, France; Institute for Atmospheric Sciences and Climate of the National Research Council (CNR-ISAC), Bologna, Italy; Central Aerological Observatory (CAO), Moscow, Russian Federation; Centre pour l'étude et la simulation du climat à l'échelle régionale, Université du Québec à Montréal, Montréal, QC, Canada
推荐引用方式 GB/T 7714	Lee K.-O.,Barret B.,Flochmoën E.L.,et al. Convective uplift of pollution from the Sichuan Basin into the Asian monsoon anticyclone during the StratoClim aircraft campaign[J],2021,21(5).
APA	Lee K.-O..,Barret B..,Flochmoën E.L..,Tulet P..,Bucci S..,...&Ulanovsky A..(2021).Convective uplift of pollution from the Sichuan Basin into the Asian monsoon anticyclone during the StratoClim aircraft campaign.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(5).
MLA	Lee K.-O.,et al."Convective uplift of pollution from the Sichuan Basin into the Asian monsoon anticyclone during the StratoClim aircraft campaign".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.5(2021).