气候变化领域集成服务门户(CCPortal): Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic

CCPortal

DOI	10.5194/acp-23-2927-2023
	Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic
	Price, Ruth; Baccarini, Andrea; Schmale, Julia; Zieger, Paul; Brooks, Ian M.; Field, Paul; Carslaw, Ken S.
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2927
结束页码	2961
卷号	23 期号:5 页码:35
英文摘要	In the Arctic, the aerosol budget plays a particular role in determining the behaviour of clouds, which are important for the surface energy balance and thus for the region's climate. A key question is the extent to which cloud condensation nuclei in the high Arctic summertime boundary layer are controlled by local emission and formation processes as opposed to transport from outside. Each of these sources is likely to respond differently to future changes in ice cover. Here we use a global model and observations from ship and aircraft field campaigns to understand the source of high Arctic aerosol in late summer. We find that particles formed remotely, i.e. at latitudes outside the Arctic, are the dominant source of boundary layer Aitken mode particles during the sea ice melt period up to the end of August. Particles from such remote sources, entrained into the boundary layer from the free troposphere, account for nucleation and Aitken mode particle concentrations that are otherwise underestimated by the model. This source from outside the high Arctic declines as photochemical rates decrease towards the end of summer and is largely replaced by local new particle formation driven by iodic acid created during freeze-up. Such a local source increases the simulated Aitken mode particle concentrations by 2 orders of magnitude during sea ice freeze-up and is consistent with strong fluctuations in nucleation mode concentrations that occur in September. Our results suggest a high-Arctic aerosol regime shift in late summer, and only after this shift do cloud condensation nuclei become sensitive to local aerosol processes.
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:000944034700001
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/273599
作者单位	University of Leeds; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Stockholm University; Met Office - UK; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne
推荐引用方式 GB/T 7714	Price, Ruth,Baccarini, Andrea,Schmale, Julia,et al. Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic[J],2023,23(5):35.
APA	Price, Ruth.,Baccarini, Andrea.,Schmale, Julia.,Zieger, Paul.,Brooks, Ian M..,...&Carslaw, Ken S..(2023).Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(5),35.
MLA	Price, Ruth,et al."Late summer transition from a free-tropospheric to boundary layer source of Aitken mode aerosol in the high Arctic".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.5(2023):35.