气候变化领域集成服务门户(CCPortal): Vertical profiles of trace gas and aerosol properties over the eastern North Atlantic: Variations with season and synoptic condition

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DOI	10.5194/acp-21-11079-2021
	Vertical profiles of trace gas and aerosol properties over the eastern North Atlantic: Variations with season and synoptic condition
	Wang Y.; Zheng G.; Jensen M.P.; Knopf D.A.; Laskin A.; Matthews A.A.; Mechem D.; Mei F.; Moffet R.; Sedlacek A.J.; Shilling J.E.; Springston S.; Sullivan A.; Tomlinson J.; Veghte D.; Weber R.; Wood R.; Zawadowicz M.A.; Wang J.
发表日期	2021
ISSN	1680-7316
起始页码	11079
结束页码	11098
卷号	21 期号:14
英文摘要	Because of their extensive coverage, marine low clouds greatly impact the global climate. Presently, the response of marine low clouds to the changes in atmospheric aerosols remains a major source of uncertainty in climate simulations. One key contribution to this large uncertainty derives from the poor understanding of the properties and processes of marine aerosols under natural conditions and the perturbation by anthropogenic emissions. The eastern North Atlantic (ENA) is a region of persistent but diverse subtropical marine boundary layer (MBL) clouds, where cloud albedo and precipitation are highly susceptible to perturbations in aerosol properties. Here we examine the key processes that drive the cloud condensation nuclei (CCN) population in the MBL using comprehensive characterizations of aerosol and trace gas vertical profiles during the Aerosol and Cloud Experiments in the Eastern North Atlantic (ACE-ENA) field campaign. During ACE-ENA, a total of 39 research flights were conducted in the Azores: 20 during summer 2017 and 19 during winter 2018. During summer, long-range-transported aerosol layers were periodically observed in the lower free troposphere (FT), leading to elevated FT CCN concentrations (NCCN). Both biomass burning and pollution from North America contribute to submicron aerosol mass in these layers, with pollution likely the dominant contributor. In contrast, long-range transported continental emissions have a much weaker influence on the aerosol properties in the ENA during the winter season. While the entrainment of FT air is a major source of particle number in the MBL for both seasons, on average it does not serve as a direct source of CCN in the MBL because the average FT NCCN is the same or even lower than that in the MBL. The particle number flux due to FT entrainment is dominated by pre-CCN (particles that are too small to form cloud droplets under typical conditions, i.e., particles with sizes below the Hoppel minimum) due to the elevated Npre-CCN in the lower FT. Once these pre-CCN are entrained into the MBL, they can grow and reach CCN size range through condensational growth, representing an indirect and major source of MBL CCN in the ENA. The impact of synoptic conditions on the aerosol properties is examined. Under pre-front and post-front conditions, shallow convective activity often leads to a deep and decoupled boundary layer. Coalescence scavenging and evaporation of drizzle below clouds lead to reduced NCCN and larger accumulation-mode particle sizes in the upper cloud-containing decoupled layer, indicating that surface measurements overestimate the NCCN relevant to the formation of MBL clouds under decoupled conditions. © 2021 Yang Wang et al.
语种	英语
scopus关键词	aerosol composition; aerosol property; cloud condensation nucleus; cloud cover; computer simulation; concentration (composition); marine atmosphere; numerical model; seasonal variation; synoptic meteorology; trace gas; vertical profile; Atlantic Ocean; Atlantic Ocean (North)
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/246711
作者单位	Center for Aerosol Science and Engineering, Washington University in St. Louis, St. Louis, Missouri, United States; Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri, United States; Environmental and Climate Sciences Department, Brookhaven National Laboratory, Upton, New York, United States; School of Marine and Atmospheric Sciences, Stony Brook University, State University of New York, Stony Brook, New York, United States; Department of Chemistry, Purdue University, West Lafayette, Indiana, United States; Atmospheric Sciences and Global Change, Pacific Northwest National Laboratory, Richland, Washington, United States; Department of Geography and Atmospheric Science, University of Kansas, Lawrence, Kansas, United States; Sonoma Technology, San Francisco, CA, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, United States; Department of Earth and Atmospheric Science, Georgia In...
推荐引用方式 GB/T 7714	Wang Y.,Zheng G.,Jensen M.P.,et al. Vertical profiles of trace gas and aerosol properties over the eastern North Atlantic: Variations with season and synoptic condition[J],2021,21(14).
APA	Wang Y..,Zheng G..,Jensen M.P..,Knopf D.A..,Laskin A..,...&Wang J..(2021).Vertical profiles of trace gas and aerosol properties over the eastern North Atlantic: Variations with season and synoptic condition.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(14).
MLA	Wang Y.,et al."Vertical profiles of trace gas and aerosol properties over the eastern North Atlantic: Variations with season and synoptic condition".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.14(2021).