DOI: 10.1029/2012JD018165
论文题名: Uncertainties and importance of sea spray composition on aerosol direct and indirect effects
作者: Tsigaridis K. ; Koch D. ; Menon S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 1 起始页码: 220
结束页码: 235
语种: 英语
英文关键词: aerosol optical depth
; cloud droplet number concentration
; organic aerosol
; sea-salt
Scopus关键词: Atmospheric aerosols
; Climate models
; Geochemistry
; Optical properties
; Aerosol optical depths
; Chemical compositions
; Cloud droplet number concentrations
; Online calculations
; Optical properties of aerosols
; Organic aerosol
; Sea salts
; Sea-salt emissions
; Uncertainty analysis
; aerosol composition
; chemical composition
; cloud droplet
; optical depth
; parameterization
; radiation balance
; size distribution
; wind velocity
英文摘要: Although ocean-derived aerosols play a critical role in modifying the radiative balance over much of the Earth, their sources are still subject to large uncertainties, concerning not only their total mass flux but also their size distribution and chemical composition. These uncertainties are linked primarily to their source drivers, which is mainly wind speed, but are also linked to other factors, such as the presence of organic compounds in sea spray in addition to sea salt. In order to quantify these uncertainties and identify the larger knowledge gaps, we performed several model runs with online calculation of aerosol sources, removal, and underlying climate. In these simulations, both the direct and indirect aerosol effects on climate are included. The oceanic source of organic aerosols was found to be heavily dependent on the sea-salt parameterization selected. For only a factor of 2 change in assumed fine-mode sea-salt size, a factor of 10 difference in mass emissions was calculated for both sea salt and primary oceanic organics. The annual emissions of oceanic organics were calculated to range from 7.5 to 76 Tg yr-1. The model's performance against remote oceanic measurements was greatly improved when including the high estimates of organics. However, the uncertainty could not be further reduced by bulk sea-salt measurements alone since most parameterizations tested agree reasonably well with measurements of both the (coarse-mode-dominated) sea salt and aerosol optical depth due to large changes in lifetime and optical properties of aerosols when different aerosol sizes are used. Key Points Understand sea-salt emissions uncertainties and impacts on marine aerosol Quantify marine organic aerosol production sources and uncertainties Study the marine aerosol composition and impact on AOD, CDNC and climate. © 2012 American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63969
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: Center for Climate Systems Research, Columbia University, 2880 Broadway, New York, NY 10025, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; U.S. Department of Energy, Washington, DC, United States; Lawrence Berkeley National Laboratory, Berkeley, CA, United States; ClimateWorks Foundation, San Francisco, CA, United States
Recommended Citation:
Tsigaridis K.,Koch D.,Menon S.. Uncertainties and importance of sea spray composition on aerosol direct and indirect effects[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(1)