气候变化领域集成服务门户(CCPortal): Deep-convective influence on the upper troposphere-lower stratosphere composition in the Asian monsoon anticyclone region: 2017 StratoClim campaign results

CCPortal

DOI	10.5194/acp-20-12193-2020
	Deep-convective influence on the upper troposphere-lower stratosphere composition in the Asian monsoon anticyclone region: 2017 StratoClim campaign results
	Bucci S.; Legras B.; Sellitto P.; D'Amato F.; Viciani S.; Montori A.; Chiarugi A.; Ravegnani F.; Ulanovsky A.; Cairo F.; Stroh F.
发表日期	2020
ISSN	16807316
起始页码	12193
结束页码	12210
卷号	20 期号:20
英文摘要	The StratoClim stratospheric aircraft campaign took place in summer 2017 in Nepal (27 July 10 August) and provided for the first time a wide dataset of observations of air composition inside the Asian monsoon anticyclone (AMA). In the framework of this project, with the purpose of modelling the injection of pollutants and natural compounds into the stratosphere, we performed a series of diffusive back trajectory runs along the flights' tracks. The availability of in situ measurements of trace gases has been exploited to evaluate the capability of the trajectory system to reproduce the transport in the upper troposphere lower stratosphere (UTLS) region. The diagnostics of the convective sources and mixing in the air parcel samples have been derived by integrating the trajectory output with highresolution observations of cloud tops from the Meteosat Second Generation (MSG1) and Himawari geostationary satellites. Back trajectories have been calculated using meteorological fields from European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis (ERA-Interim and ERA5) at 3 and 1 h resolution, using both kinematic and diabatic vertical motion. The comparison among the different trajectory runs shows, in general, a higher consistency with observed data as well as a better agreement between the diabatic and kinematic version when using ERA5-based runs with respect to ERA-Interim. Overall, a better capacity in reproducing the pollution features is finally found in the diabatic version of the ERA5 runs. We therefore adopt this setting to analyse the convective influence in the UTLS starting from the StratoClim observations. A large variety of transport conditions have been individuated during the eight flights of the campaign. The larger influence by convective injections is found from the continental sources of China and India. Only a small contribution appears to be originated from maritime regions, in particular the South Pacific and the Bay of Bengal, which, unexpectedly, was not particularly active during the period of the campaign. In addition, a mass of clean air injected from a typhoon has also been detected at around 18 km. Thin filamentary structures of polluted air, characterized by peaks in CO, are observed, mostly associated with young convective air (age less than a few days) and with a predominant South China origin. The analysis revealed a case of direct injection of highly polluted air close to the level of the tropopause (anomalies of around 80 ppbv injected at 16 km) that then kept rising inside the anticyclonic circulation. Due to the location of the campaign, air from continental India, in contrast, has been only observed to be linked to air masses that recirculated within the anticyclone for 10 to 20 d, resulting in a lower concentration of the trace gas. The analysis of a flight overpassing an intense convective system close to the southern Nepalese border revealed the injection of very young air (few hours of age) directly in the tropopause region (∼ 18 km), visible in the trace gases as an enhancement in CO and a depletion in the O3 one. From the whole campaign, a vertical stratification in the age of air is observed: up to 15 km, the age is less than 3 d, and these fresh air masses constitute almost the totality of the air composition. A transition layer is then individuated between 15 and 17 km, where the convective contribution is still dominant, and the ages vary between 1 and 2 weeks. Above this level, the mean age of the air sampled by the aircraft is estimated to be 20 d. There, the convective contribution rapidly decreases with height and finally becomes negligible around 20 km. © 2020 Author(s).
语种	英语
scopus关键词	airborne survey; anticyclone; atmospheric chemistry; atmospheric pollution; atmospheric transport; chemical composition; comparative study; convective system; data set; in situ measurement; Meteosat; monsoon; stratosphere-troposphere interaction; trace gas; tropopause; Nepal; Satellites
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/143876
作者单位	Laboratoire de Météorologie Dynamique (LMD), UMR 8539, CNRS, École Normale Supérieure, PSL Research University, École Polytechnique, Sorbonne Université, École des Ponts ParisTech, Institut Pierre Simon Laplace, Paris, France; Laboratoire Inter-universitaire des Systèmes Atmosphériques (LISA), UMR 7583, CNRS, Universitè Paris-Est-Créteil, Université de Paris, Institut Pierre-Simon Laplace, Créteil, France; Consiglio Nazionale Delle Ricerche, Istituto Nazionale di Ottica (CNR-INO), Area CNR, Via Madonna del Piano 10, Sesto F. no (FI), 50019, Italy; National Institute of Geophysics and Vulcanology (INGV), Pisa, Italy; National Resears Council, Institute for Atmospheric Sciences and Climate (ISAC-CNR), Bologna and Rome, Italy; Central Aerological Observatory (CAO), Moscow, Russian Federation; Institute of Energy and Climate Research, Stratosphere, Forschungszentrum Jülich, Jülich, Germany; SENSIT Technologies, Valparaiso, IN, United States
推荐引用方式 GB/T 7714	Bucci S.,Legras B.,Sellitto P.,et al. Deep-convective influence on the upper troposphere-lower stratosphere composition in the Asian monsoon anticyclone region: 2017 StratoClim campaign results[J],2020,20(20).
APA	Bucci S..,Legras B..,Sellitto P..,D'Amato F..,Viciani S..,...&Stroh F..(2020).Deep-convective influence on the upper troposphere-lower stratosphere composition in the Asian monsoon anticyclone region: 2017 StratoClim campaign results.Atmospheric Chemistry and Physics,20(20).
MLA	Bucci S.,et al."Deep-convective influence on the upper troposphere-lower stratosphere composition in the Asian monsoon anticyclone region: 2017 StratoClim campaign results".Atmospheric Chemistry and Physics 20.20(2020).