DOI: 10.1029/2012GL054428
论文题名: Airborne observations of aerosol extinction by in situ and remote-sensing techniques: Evaluation of particle hygroscopicity
作者: Ziemba L.D. ; Thornhill K.L. ; Ferrare R. ; Barrick J. ; Beyersdorf A.J. ; Chen G. ; Crumeyrolle S.N. ; Hair J. ; Hostetler C. ; Hudgins C. ; Obland M. ; Rogers R. ; Scarino A.J. ; Winstead E.L. ; Anderson B.E.
刊名: Geophysical Research Letters
ISSN: 0094-9356
EISSN: 1944-9087
出版年: 2013
卷: 40, 期: 2 起始页码: 417
结束页码: 422
语种: 英语
Scopus关键词: Aerosol extinction
; Airborne observations
; Ambient conditions
; Extinction coefficients
; Microphysical property
; Particle hygroscopicity
; Statistical comparisons
; Visible light
; Aerosols
; Aircraft
; Light extinction
; NASA
; Optical radar
; Remote sensing
; Uncertainty analysis
; aerosol composition
; air quality
; airborne sensing
; aircraft
; hygroscopicity
; in situ measurement
; lidar
; NSCAT
; optical depth
; relative humidity
; remote sensing
; spatiotemporal analysis
; urban area
; Baltimore
; Maryland
; United States
; Washington [United States]
英文摘要: Extensive profiling of aerosol optical, chemical, and microphysical properties was performed in the Washington DC/Baltimore MD region in July 2011 during NASA DISCOVER-AQ. In situ extinction coefficient (σ ext,in-situ) measurements were made aboard the NASA P3-B aircraft coincident with remote-sensing observations by the High-Spectral Resolution Lidar (HSRL; σext,HSRL) aboard the NASA UC-12 aircraft. A statistical comparison revealed good agreement within instrumental uncertainty (σext,in-situ=1.1σext,HSRL-3.2Mm -1, r2 = 0.88) and demonstrated the robust nature of hygroscopicity measurements (f(RH)) necessary to correct observations at dry relative humidity (RH) to ambient conditions. The average liquid-water contribution to ambient visible-light extinction was as much as 43% in this urban region. f(RH) values were observed to vary significantly from 1.1 to 2.1 on a day-to-day basis suggesting influence from both local and transported sources. Results emphasize the importance of accounting for the RH dependence of optical- and mass-based aerosol air-quality measurements (e.g., of PM 2.5), especially in relation to satellite and remotesensing retrievals. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874849428&doi=10.1029%2f2012GL054428&partnerID=40&md5=b1c14fc1fc6d280d0c40712cabbfb4b8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6620
Appears in Collections: 气候减缓与适应
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作者单位: NASA Langley Research Center, Chemistry and Dynamics Branch, Building 1250, 21 Langley Boulevard, Hampton, VA 23681, United States
Recommended Citation:
Ziemba L.D.,Thornhill K.L.,Ferrare R.,et al. Airborne observations of aerosol extinction by in situ and remote-sensing techniques: Evaluation of particle hygroscopicity[J]. Geophysical Research Letters,2013-01-01,40(2).