气候变化领域集成服务门户(CCPortal): Global modeling studies of composition and decadal trends of the Asian Tropopause Aerosol Layer

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DOI	10.5194/acp-21-2745-2021
	Global modeling studies of composition and decadal trends of the Asian Tropopause Aerosol Layer
	Bossolasco A.; Jegou F.; Sellitto P.; Berthet G.; Kloss C.; Legras B.
发表日期	2021
ISSN	1680-7316
起始页码	2745
结束页码	2764
卷号	21 期号:4
英文摘要	The Asian summer monsoon (ASM) traps convectively lifted boundary layer pollutants inside its upper-tropospheric lower-stratospheric Asian monsoon anticyclone (AMA). It is associated with a seasonal and spatially confined enhanced aerosol layer, called the Asian Tropopause Aerosol Layer (ATAL). Due to the dynamical variability of the AMA, the dearth of in situ observations in this region, the complexity of the emission sources and of transport pathways, knowledge of the ATAL properties in terms of aerosol budget, chemical composition, as well as its variability and temporal trend is still largely uncertain. In this work, we use the Community Earth System Model (CESM 1.2 version) based on the coupling of the Community Atmosphere Model (CAM5) and the MAM7 (Modal Aerosol Model) aerosol module to simulate the composition of the ATAL and its decadal trends. Our simulations cover a long-term period of 16 years from 2000 to 2015. We identify a typical "double-peak"vertical profile of aerosols for the ATAL. We attribute the upper peak (around 100 hPa, predominant during early ATAL, e.g., in June) to dry aerosols, possibly from nucleation processes, and the lower peak (around 250 hPa, predominant for a well-developed and late ATAL, e.g., in July and August) to cloud-borne aerosols associated with convective clouds. We find that mineral dust (present in both peaks) is the dominant aerosol by mass in the ATAL, showing a large interannual variability but no long-term trend, due to its natural variability. The results between 120 and 80 hPa (dry aerosol peak) suggest that for aerosols other than dust the ATAL is composed of around 40 % of sulfate, 30 % of secondary and 15 % of primary organic aerosols, 14 % of ammonium aerosols and less than 3 % of black carbon. Nitrate aerosols are not considered in MAM7. The analysis of the anthropogenic and biomass burning aerosols shows a positive trend for all aerosols simulated by CESM-MAM7. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; atmospheric convection; black carbon; concentration (composition); monsoon; seasonal variation; source apportionment; tropopause; Asia
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/247121
作者单位	Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, CNRS/Université d'Orléans, Umr 7328, Orléans, France
推荐引用方式 GB/T 7714	Bossolasco A.,Jegou F.,Sellitto P.,et al. Global modeling studies of composition and decadal trends of the Asian Tropopause Aerosol Layer[J],2021,21(4).
APA	Bossolasco A.,Jegou F.,Sellitto P.,Berthet G.,Kloss C.,&Legras B..(2021).Global modeling studies of composition and decadal trends of the Asian Tropopause Aerosol Layer.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(4).
MLA	Bossolasco A.,et al."Global modeling studies of composition and decadal trends of the Asian Tropopause Aerosol Layer".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.4(2021).