气候变化领域集成服务门户(CCPortal): Occurrence and growth of sub-50 nm aerosol particles in the Amazonian boundary layer

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DOI	10.5194/acp-22-3469-2022
	Occurrence and growth of sub-50 nm aerosol particles in the Amazonian boundary layer
	Franco, Marco A.; Ditas, Florian; Kremper, Leslie A.; Machado, Luiz A. T.; Andreae, Meinrat O.; Araujo, Alessandro; Barbosa, Henrique M. J.; de Brito, Joel F.; Carbone, Samara; Holanda, Bruna A.; Morais, Fernando G.; Nascimento, Janaina P.; Poehlker, Mira L.; Rizzo, Luciana, V; Sa, Marta; Saturno, Jorge; Walter, David; Wolff, Stefan; Poeschl, Ulrich; Artaxo, Paulo; Poehlker, Christopher
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	3469
结束页码	3492
卷号	22 期号:5 页码:24
英文摘要	New particle formation (NPF), referring to the nucleation of molecular clusters and their subsequent growth into the cloud condensation nuclei (CCN) size range, is a globally significant and climate-relevant source of atmospheric aerosols. Classical NPF exhibiting continuous growth from a few nanometers to the Aitken mode around 60-70 nm is widely observed in the planetary boundary layer (PBL) around the world but not in central Amazonia. Here, classical NPF events are rarely observed within the PBL, but instead, NPF begins in the upper troposphere (UT), followed by downdraft injection of sub-50 nm (CN<50) particles into the PBL and their subsequent growth. Central aspects of our understanding of these processes in the Amazon have remained enigmatic, however. Based on more than 6 years of aerosol and meteorological data from the Amazon Tall Tower Observatory (ATTO; February 2014 to September 2020), we analyzed the diurnal and seasonal patterns as well as meteorological conditions during 254 of such Amazonian growth events on 217 event days, which show a sudden occurrence of particles between 10 and 50 nm in the PBL, followed by their growth to CCN sizes. The occurrence of events was significantly higher during the wet season, with 88 % of all events from January to June, than during the dry season, with 12 % from July to December, probably due to differences in the condensation sink (CS), atmospheric aerosol load, and meteorological conditions. Across all events, a median growth rate (GR) of 5.2 nm h(-1) and a median CS of 1.1 x 10(-3) s(-1) were observed. The growth events were more frequent during the daytime (74 %) and showed higher GR (5.9 nm h(-1)) compared to nighttime events (4.0 nm h(-1)), emphasizing the role of photochemistry and PBL evolution in particle growth. About 70 % of the events showed a negative anomaly of the equivalent potential temperature (Delta theta(e)') - as a marker for downdrafts - and a low satellite brightness temperature (Tir) - as a marker for deep convective clouds - in good agreement with particle injection from the UT in the course of strong convective activity. About 30 % of the events, however, occurred in the absence of deep convection, partly under clear-sky conditions, and with a positive Delta theta(e)' anomaly. Therefore, these events do not appear to be related to downdraft transport and suggest the existence of other currently unknown sources of sub-50 nm particles.
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:000772536900001
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/273264
作者单位	Universidade de Sao Paulo; Max Planck Society; University of California System; University of California San Diego; Scripps Institution of Oceanography; King Saud University; Empresa Brasileira de Pesquisa Agropecuaria (EMBRAPA); IMT - Institut Mines-Telecom; IMT Nord Europe; Universite de Lille - ISITE; Universite de Lille; Universidade Federal de Uberlandia; Institute Nacional de Pesquisas da Amazonia; Universidade Federal de Sao Paulo (UNIFESP); Max Planck Society; Leibniz Institut fur Tropospharenforschung (TROPOS); National Oceanic Atmospheric Admin (NOAA) - USA; Physikalisch-Technische Bundesanstalt (PTB); Max Planck Society
推荐引用方式 GB/T 7714	Franco, Marco A.,Ditas, Florian,Kremper, Leslie A.,et al. Occurrence and growth of sub-50 nm aerosol particles in the Amazonian boundary layer[J],2022,22(5):24.
APA	Franco, Marco A..,Ditas, Florian.,Kremper, Leslie A..,Machado, Luiz A. T..,Andreae, Meinrat O..,...&Poehlker, Christopher.(2022).Occurrence and growth of sub-50 nm aerosol particles in the Amazonian boundary layer.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(5),24.
MLA	Franco, Marco A.,et al."Occurrence and growth of sub-50 nm aerosol particles in the Amazonian boundary layer".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.5(2022):24.