气候变化领域集成服务门户(CCPortal): Influences of Recent Particle Formation on Southern Ocean Aerosol Variability and Low Cloud Properties

CCPortal

DOI	10.1029/2020JD033529
	Influences of Recent Particle Formation on Southern Ocean Aerosol Variability and Low Cloud Properties
	McCoy I.L.; Bretherton C.S.; Wood R.; Twohy C.H.; Gettelman A.; Bardeen C.G.; Toohey D.W.
发表日期	2021
ISSN	2169897X
卷号	126 期号:8
英文摘要	Controls on pristine aerosol over the Southern Ocean (SO) are critical for constraining the strength of global aerosol indirect forcing. Observations of summertime SO clouds and aerosols in synoptically varied conditions during the 2018 SOCRATES aircraft campaign reveal novel mechanisms influencing pristine aerosol-cloud interactions. The SO free troposphere (3–6 km) is characterized by widespread, frequent new particle formation events contributing to much larger concentrations (≥1,000 mg−1) of condensation nuclei (diameters > 0.01 μm) than in typical sub-tropical regions. Synoptic-scale uplift in warm conveyor belts and sub-polar vortices lifts marine biogenic sulfur-containing gases to free-tropospheric environments favorable for generating Aitken-mode aerosol particles (0.01–0.1 μm). Free-tropospheric Aitken particles subside into the boundary layer, where they grow in size to dominate the sulfur-based cloud condensation nuclei (CCN) driving SO cloud droplet number concentrations (Nd ∼ 60–100 cm−3). Evidence is presented for a hypothesized Aitken-buffering mechanism which maintains persistently high summertime SO Nd against precipitation removal through CCN replenishment from activation and growth of boundary layer Aitken particles. Nudged hindcasts from the Community Atmosphere Model (CAM6) are found to underpredict Aitken and accumulation mode aerosols and Nd, impacting summertime cloud brightness and aerosol-cloud interactions and indicating incomplete representations of aerosol mechanisms associated with ocean biology. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol-cloud interactions; global climate models; new particle formation; pristine climate; Southern Ocean; synoptic systems
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185309
作者单位	Atmospheric Sciences, University of Washington, Seattle, WA, United States; Northwest Research Associates, Redmond, WA, United States; National Center for Atmospheric Research, Boulder, CO, United States; Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States
推荐引用方式 GB/T 7714	McCoy I.L.,Bretherton C.S.,Wood R.,et al. Influences of Recent Particle Formation on Southern Ocean Aerosol Variability and Low Cloud Properties[J],2021,126(8).
APA	McCoy I.L..,Bretherton C.S..,Wood R..,Twohy C.H..,Gettelman A..,...&Toohey D.W..(2021).Influences of Recent Particle Formation on Southern Ocean Aerosol Variability and Low Cloud Properties.Journal of Geophysical Research: Atmospheres,126(8).
MLA	McCoy I.L.,et al."Influences of Recent Particle Formation on Southern Ocean Aerosol Variability and Low Cloud Properties".Journal of Geophysical Research: Atmospheres 126.8(2021).