globalchange  > 影响、适应和脆弱性
DOI: 10.1002/jgrd.50853
论文题名:
Los Angeles Basin airborne organic aerosol characterization during CalNex
作者: Craven J.S.; Metcalf A.R.; Bahreini R.; Middlebrook A.; Hayes P.L.; Duong H.T.; Sorooshian A.; Jimenez J.L.; Flagan R.C.; Seinfeld J.H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期:19
起始页码: 11453
结束页码: 11467
语种: 英语
英文关键词: airborne ; Los Angeles ; organic aerosol ; PMF
Scopus关键词: Loading ; Oxidation ; Aerodyne aerosol mass spectrometer ; airborne ; Los angeles ; Los Angeles Basin ; Mass concentration ; Organic aerosol ; PMF ; Positive Matrix Factorization ; Aerosols ; aerosol composition ; aerosol property ; data set ; outflow ; oxidation ; spatial analysis ; California ; Los Angeles [California] ; United States
英文摘要: We report airborne organic aerosol (OA) measurements over Los Angeles carried out in May 2010 as part of the CalNex field campaign. The principal platform for the airborne data reported here was the CIRPAS Twin Otter (TO); airborne data from NOAA WP-3D aircraft and Pasadena CalNex ground-site data acquired during simultaneous TO flybys are also presented. Aerodyne aerosol mass spectrometer measurements constitute the main source of data analyzed. The increase in organic aerosol oxidation from west to east in the basin was sensitive to OA mass loading, with a greater spatial trend in O:C associated with lower mass concentration. Three positive matrix factorization (PMF) components (hydrocarbon-like organic aerosol (HOA), semi-volatile oxidized organic aerosol (SVOOA), and low volatility oxidized organic aerosol (LVOOA)) were resolved for the one flight that exhibited the largest variability in estimated O:C ratio. Comparison of the PMF factors with two optical modes of refractory black carbon (rBC)-containing aerosol revealed that the coating of thinly coated rBC-containing aerosol, dominant in the downtown region, is likely composed of HOA, whereas more thickly coated rBC-containing aerosol, dominant in the Banning pass outflow, is composed of SVOOA and LVOOA. The correlation of water-soluble organic mass to oxidized organic aerosol (OOA) is higher in the outflows than in the basin due to the higher mass fraction of OOA/OA in the outflows. By comparison, the average OA concentration over Mexico City MILAGRO (Megacity Initiative: Local and Global Research Observations) campaign was ∼7 times higher than the airborne average during CalNex. Key Points Airborne organic aerosol measurements over LA are reported Spatial pattern of O:C depends on amount of organic aerosol present PMF factors are correlated with two modes of rBC containing aerosol ©2013. American Geophysical Union. All Rights Reserved.
资助项目: DE-FG02-11ER65293 ; DE-SC0006035 ; NA09OAR4310128
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63259
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: Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena CA 91125, United States; Division of Engineering and Applied Science, California Institute of Technology, Pasadena CA, United States; Combustion Research Facility, Sandia National Laboratories, Livermore CA, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder CO, United States; Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder CO, United States; Department of Environmental Sciences, University of California, Riverside CA, United States; Department of Chemistry and Biochemistry, University of Colorado, Boulder CO, United States; Department of Chemical and Environmental Engineering, University of Arizona, Tucson AZ, United States; Department of Atmospheric Sciences, University of Arizona, Tucson AZ, United States

Recommended Citation:
Craven J.S.,Metcalf A.R.,Bahreini R.,et al. Los Angeles Basin airborne organic aerosol characterization during CalNex[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)
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