期刊
ATMOSPHERIC ENVIRONMENT
卷 55, 期 -, 页码 190-200出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2012.03.011
关键词
Aerosol optics; Single scatter albedo; Scattering coefficient; Extinction coefficient; Absorption coefficient; Mass absorption cross section; Mass scatter efficiency; Direct climate forcing; CalNex; Albedometer; Brown carbon; WSOC; Absorption enhancement
资金
- California Air Resources Board (CARB)
- National Oceanic & Atmospheric Administration (NOM)
- NSF [ATM0531926, ATM1032312, ATM-0634872, ATM-1004114, ATM-0931492]
- global environment research fund of the Japanese Ministry of the Environment [A-1101]
- State of Texas/Texas Tech University
- CARB [08319]
- DOE (BER/ASR Program) [DE-SC0006035]
- CIRES
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1032312] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0931492] Funding Source: National Science Foundation
Aerosol optical properties measured at the Pasadena, CA site during the CalNex field campaign in May -June 2010 are summarized. Average measurements of PM2.5 aerosol extinction, scattering, absorption coefficients, and single scattering albedo (b(ext), b(scat), b(abs) and SSA) at lambda = 532 nm were 62 Mm(-1), 58 Mm(-1), 4 Mm(-1), and 0.92, respectively. The aerosol optical densities were 5 times lower than during the SCAQS study in 1987, highlighting major progress in PM control in the Los Angeles area in the last two decades. The period May 30-June 8 2010 was characterized by exceptionally high aerosol loading (b(ext) up to 250 Mm(-1)). During this period, b(ext), b(scat), and SSA tended to peak during the mid-morning. Correlation of PM2.5 b(ext), b(scat) with mass concentration data yielded mass scattering and mass extinction coefficients of 3.5-5.1 m(2) g(-1) for 532 nm. Aerosol b(abs) were compared directly to mass concentration of elemental carbon (EC) yielding a campaign average mass absorption cross section (M.A.C.) of 5.7 +/- 1.8 m(2) g(-1). TEM analysis of particles suggests soot was often internally mixed or adhering to sulfate and/or organics. Total non-refractory PM1 mass was a good quantitative indicator of coated soot fraction. Alteration of M.A.C. with mixing/coating state was not detected, however, increases in M.A.C. were linked to the presence of light absorbing, water-soluble organic carbon (WSOC) suggesting a possible role of this material invisible light absorption in the LA basin. (C) 2012 Elsevier Ltd. All rights reserved.
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