DOI: 10.1002/2014GL061669
论文题名: Trends in sulfate and organic aerosol mass in the Southeast U.S.: Impact on aerosol optical depth and radiative forcing
作者: Attwood A.R. ; Washenfelder R.A. ; Brock C.A. ; Hu W. ; Baumann K. ; Campuzano-Jost P. ; Day D.A. ; Edgerton E.S. ; Murphy D.M. ; Palm B.B. ; McComiskey A. ; Wagner N.L. ; De Sá S.S. ; Ortega A. ; Martin S.T. ; Jimenez J.L. ; Brown S.S.
刊名: Geophysical Research Letters
ISSN: 0094-9655
EISSN: 1944-9386
出版年: 2014
卷: 41, 期: 21 起始页码: 7701
结束页码: 7709
语种: 英语
英文关键词: atmospheric aerosol
; extinction
; hygroscopicity
; sulfate
; trends
; visibility
Scopus关键词: Atmospheric humidity
; Atmospheric radiation
; Emission control
; Light extinction
; Oceanography
; Optical properties
; Sulfur dioxide
; Visibility
; Aerosol composition
; Aerosol light extinction
; Aerosol optical depths
; Composition changes
; hygroscopicity
; Radiative forcings
; sulfate
; trends
; Atmospheric aerosols
; aerosol
; anthropogenic effect
; chemical composition
; optical depth
; radiative forcing
; seasonal variation
; sulfate
; water mass
; United States
英文摘要: Emissions of SO2 in the United States have declined since the early 1990s, resulting in a decrease in aerosol sulfate mass in the Southeastern U.S. of -4.5(±0.9)% yr-1 between 1992 and 2013. Organic aerosol mass, the other major aerosol component in the Southeastern U.S., has decreased more slowly despite concurrent emission reductions in anthropogenic precursors. Summertime measurements in rural Alabama quantify the change in aerosol light extinction as a function of aerosol composition and relative humidity. Application of this relationship to composition data from 2001 to 2013 shows that a -1.1(±0.7)% yr-1 decrease in extinction can be attributed to decreasing aerosol water mass caused by the change in aerosol sulfate/organic ratio. Calculated reductions in extinction agree with regional trends in ground-based and satellite-derived aerosol optical depth. The diurnally averaged summertime surface radiative effect has changed by 8.0 W m-2, with 19% attributed to the decrease in aerosol water. Key Points Aerosol sulfate mass has decreased faster than organic mass in the SE U.S.Aerosol water mass has decreased due to decreasing sulfate/organic ratioAerosol extinction and radiative forcing have changed due to composition changes ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84912121196&doi=10.1002%2f2014GL061669&partnerID=40&md5=7e0b070cd2c2a69bf3559d0beb76f209
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6919
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, United States
Recommended Citation:
Attwood A.R.,Washenfelder R.A.,Brock C.A.,et al. Trends in sulfate and organic aerosol mass in the Southeast U.S.: Impact on aerosol optical depth and radiative forcing[J]. Geophysical Research Letters,2014-01-01,41(21).