DOI: 10.1002/jgrd.50598
论文题名: Impact of marine biogeochemistry on the chemical mixing state and cloud forming ability of nascent sea spray aerosol
作者: Collins D.B. ; Ault A.P. ; Moffet R.C. ; Ruppel M.J. ; Cuadra-Rodriguez L.A. ; Guasco T.L. ; Corrigan C.E. ; Pedler B.E. ; Azam F. ; Aluwihare L.I. ; Bertram T.H. ; Roberts G.C. ; Grassian V.H. ; Prather K.A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8553
结束页码: 8565
语种: 英语
英文关键词: aerosol mixing state
; chemistry-climate interactions
; cloud condensation nuclei
; marine bacteria
; sea spray aerosol
Scopus关键词: Atmospheric chemistry
; Bacteria
; Bioactivity
; Biogeochemistry
; Condensation
; Experiments
; Mixing
; Seawater
; Aerosol mixing
; Chemistry-climate interaction
; Cloud condensation nuclei
; Marine bacterium
; Sea spray aerosols
; Aerosols
; aerosol
; bioactivity
; biogeochemistry
; chemical composition
; chlorophyll a
; cloud
; cloud condensation nucleus
; concentration (composition)
; condensation
; hygroscopicity
; marine environment
; mesocosm
; particle size
; prediction
英文摘要: The composition and properties of sea spray aerosol, a major component of the atmosphere, are often controlled by marine biological activity; however, the scope of impacts that ocean chemistry has on the ability for sea spray aerosol to act as cloud condensation nuclei (CCN) is not well understood. In this study, we utilize a mesocosm experiment to investigate the impact of marine biogeochemical processes on the composition and mixing state of sea spray aerosol particles with diameters < 0.2 μm produced by controlled breaking waves in a unique ocean-atmosphere facility. An increase in relative abundance of a distinct, insoluble organic particle type was observed after concentrations of heterotrophic bacteria increased in the seawater, leading to an 86 ± 5% reduction in the hygroscopicity parameter (κ) at 0.2% supersaturation. Aerosol size distributions showed very little change and the submicron organic mass fraction increased by less than 15% throughout the experiment; as such, neither of these typical metrics can explain the observed reduction in hygroscopicity. Predictions of the hygroscopicity parameter that make the common assumption that all particles have the same bulk organic volume fractions lead to overpredictions of CCN concentrations by 25% in these experiments. Importantly, key changes in sea spray aerosol mixing state that ultimately influenced CCN activity were driven by bacteria-mediated alterations to the organic composition of seawater. Key Points Sea spray aerosol mixing state can strongly control its cloud forming ability Marine bacteria influence seawater composition and sea spray composition Organic species in sea spray can change independently of chlorophyll-a ©2013. American Geophysical Union. All Rights Reserved.
资助项目: DE-AC02-05CH11231
; OCE0962721
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63448
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Chemistry and Biochemistry, University of California, San Diego, San Diego CA 92093-0314, United States; Department of Chemistry, University of Iowa, Iowa City IA, United States; Department of Chemistry, University of the Pacific, Stockton CA, United States; Scripps Institution of Oceanography, University of California, San Diego, San Diego CA, United States; Centre National de Recherches Météorologiques (GAME) - Météo, Toulouse CEDEX 1, France
Recommended Citation:
Collins D.B.,Ault A.P.,Moffet R.C.,et al. Impact of marine biogeochemistry on the chemical mixing state and cloud forming ability of nascent sea spray aerosol[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)