DOI: 10.1002/jgrd.50768
论文题名: An improved whitecap timescale for sea spray aerosol production flux modeling using the discrete whitecap method
作者: Callaghan A.H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 9997
结束页码: 10010
语种: 英语
英文关键词: breaking waves
; discrete whitecap method
; sea spray aerosol
; SSA production flux
; whitecap timescale
Scopus关键词: Aerosols
; Parameterization
; Breaking waves
; discrete whitecap method
; Flux parameterization
; Martha's vineyard coastal observatories
; Particle production
; Sea spray aerosols
; Surfactant stabilization
; Time-scales
; Uncertainty analysis
; aerosol
; breaking wave
; data set
; estimation method
; flux measurement
; numerical model
; parameterization
; stabilization
; surfactant
; timescale
; vineyard
; United States
英文摘要: The discrete whitecap method (DWM) to model the sea spray aerosol (SSA) production flux explicitly requires a whitecap timescale, which up to now has only considered a whitecap decay timescale, τdecay . A reevaluation of the DWM suggests that the whitecap timescale should account for the total whitecap lifetime (τwcap ), which consists of both the formation timescale (τform ) and the decay timescale (timescale definitions are given in the text). Here values of τform for 552 oceanic whitecaps measured at the Martha's Vineyard Coastal Observatory on the east coast of the USA are presented, and added to the corresponding values of τdecay to form 552 whitecap timescales. For the majority of whitecaps, τform makes up about 20-25% of τwcap , but this can be as large as 70% depending on the value of τdecay . Furthermore, an area-weighted mean whitecap timescale for use in the DWM (τDWM ) is defined that encompasses the variable nature of individual whitecap lifetimes within a given time period, and is calculated to be 5.3 s for this entire data set. This value is combined with previously published whitecap coverage parameterizations and estimates of SSA particle production per whitecap area to form a size-resolved SSA production flux parameterization (dF(r80 )/dlog10 r80 ). This parameterization yields integrated sea-salt mass fluxes that are largely within the range of uncertainty of recent measurements over the size range 0.029 μm < r80 < 0.580 μm. Physical factors controlling whitecap lifetime such as bubble plume lifetime and surfactant stabilization are discussed in the context of SSA production from whitecaps. Key PointsWhitecap lifetimes are not constant and vary on a wave by wave basisWhitecap formation timescales contribute 10%-70% of whitecap lifetimeA new discrete whitecap method timescale is defined ©2013. American Geophysical Union. All Rights Reserved. 资助项目: N00014-10738
; N00014-11-1-0158
; N00014-11030
; OCE-1155123
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63357
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: School of Physics, Ryan Institute, National University of Ireland, Galway, Ireland; Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States
Recommended Citation:
Callaghan A.H.. An improved whitecap timescale for sea spray aerosol production flux modeling using the discrete whitecap method[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)