Matches in SemOpenAlex for { <https://semopenalex.org/work/W1973792583> ?p ?o ?g. }
- W1973792583 abstract "Abstract. The scattering and absorption of solar radiation by atmospheric aerosols is a key element of the Earth's radiative energy balance and climate. The optical properties of aerosol particles are, however, highly variable and not well characterized, especially near newly emerging mega-cities. In this study, aerosol optical properties were measured at a regional background site approximately 60 km northwest of the mega-city Guangzhou in southeast China. The measurements were part of the Program of Regional Integrated Experiments of Air Quality over the Pearl River Delta intensive campaign (PRIDE-PRD2006), covering the period of 1–30 July 2006. Scattering and absorption coefficients of dry aerosol particles with diameters up to 10 μm (PM10) were determined with a three-wavelength integrating nephelometer and with a photoacoustic spectrometer, respectively. Averaged over the measurement campaign (arithmetic mean ±standard deviation), the total scattering coefficients were 200±133 Mm−1 (450 nm), 151±103 Mm−1 (550 nm) and 104±72 Mm−1 (700 nm) and the absorption coefficient was 34.3±26.5 Mm−1 (532 nm). The average Ångström exponent was 1.46±0.21 (450 nm/700 nm) and the average single scattering albedo was 0.82±0.07 (532 nm) with minimum values as low as 0.5. The low single scattering albedo values indicate a high abundance of, as well as strong sources of light absorbing carbon (LAC). The ratio of LAC to CO concentration was highly variable throughout the campaign, indicating a complex mix of different combustion sources. The scattering and absorption coefficients, as well as the Ångström exponent and single scattering albedo, exhibited pronounced diurnal cycles, which can be attributed to boundary layer mixing effects and enhanced nighttime emissions of LAC (diesel soot from regulated truck traffic). The daytime average single scattering albedo of 0.87 appears to be more suitable for climate modeling purposes than the 24-h average of 0.82, as the latter value is strongly influenced by fresh emissions into a shallow nocturnal boundary layer. In spite of high photochemical activity during daytime, we found no evidence for strong local production of secondary aerosol mass. The relatively low average mass scattering efficiency with respect to PM10 (2.84±0.037 m2 g−1, λ=550 nm) indicates a high proportion of mass in the coarse particle fraction (diameter >1 μm). During high pollution episodes, however, the Ångström exponent exhibited a dependence on wavelength, which indicates an enhancement of the fine particle fraction during these periods. A negative correlation between single scattering albedo and backscatter fraction was observed and found to affect the impact that these parameters have on aerosol radiative forcing efficiency." @default.
- W1973792583 created "2016-06-24" @default.
- W1973792583 creator A5003987428 @default.
- W1973792583 creator A5005940936 @default.
- W1973792583 creator A5010993723 @default.
- W1973792583 creator A5015340355 @default.
- W1973792583 creator A5021112220 @default.
- W1973792583 creator A5026304853 @default.
- W1973792583 creator A5036651287 @default.
- W1973792583 creator A5045617018 @default.
- W1973792583 creator A5045647259 @default.
- W1973792583 creator A5046558730 @default.
- W1973792583 creator A5048315190 @default.
- W1973792583 creator A5052166339 @default.
- W1973792583 creator A5057359066 @default.
- W1973792583 creator A5058609162 @default.
- W1973792583 creator A5062393196 @default.
- W1973792583 creator A5063605514 @default.
- W1973792583 creator A5066741040 @default.
- W1973792583 date "2008-04-09" @default.
- W1973792583 modified "2023-09-22" @default.
- W1973792583 title "Aerosol optical properties in a rural environment near the mega-city Guangzhou, China: implications for regional air pollution and radiative forcing" @default.
- W1973792583 cites W1967451956 @default.
- W1973792583 cites W1969426993 @default.
- W1973792583 cites W1974603386 @default.
- W1973792583 cites W1976282922 @default.
- W1973792583 cites W1977252578 @default.
- W1973792583 cites W1981437093 @default.
- W1973792583 cites W1982697315 @default.
- W1973792583 cites W1983175659 @default.
- W1973792583 cites W1984571438 @default.
- W1973792583 cites W1987057659 @default.
- W1973792583 cites W1988469779 @default.
- W1973792583 cites W1989913777 @default.
- W1973792583 cites W1991834964 @default.
- W1973792583 cites W1993602674 @default.
- W1973792583 cites W1995123924 @default.
- W1973792583 cites W1997289136 @default.
- W1973792583 cites W1997573858 @default.
- W1973792583 cites W2002614078 @default.
- W1973792583 cites W2012299318 @default.
- W1973792583 cites W2020729558 @default.
- W1973792583 cites W2021856711 @default.
- W1973792583 cites W2022904453 @default.
- W1973792583 cites W2026920424 @default.
- W1973792583 cites W2027505123 @default.
- W1973792583 cites W2030733465 @default.
- W1973792583 cites W2030904318 @default.
- W1973792583 cites W2035894005 @default.
- W1973792583 cites W2042785026 @default.
- W1973792583 cites W2044141801 @default.
- W1973792583 cites W2044582584 @default.
- W1973792583 cites W2050250373 @default.
- W1973792583 cites W2055388230 @default.
- W1973792583 cites W2058903389 @default.
- W1973792583 cites W2063196138 @default.
- W1973792583 cites W2068544775 @default.
- W1973792583 cites W2074568061 @default.
- W1973792583 cites W2081897018 @default.
- W1973792583 cites W2082572999 @default.
- W1973792583 cites W2083769183 @default.
- W1973792583 cites W2089412067 @default.
- W1973792583 cites W2092641130 @default.
- W1973792583 cites W2093054631 @default.
- W1973792583 cites W2096477182 @default.
- W1973792583 cites W2102948292 @default.
- W1973792583 cites W2105034494 @default.
- W1973792583 cites W2112385570 @default.
- W1973792583 cites W2118032798 @default.
- W1973792583 cites W2118893723 @default.
- W1973792583 cites W2120014574 @default.
- W1973792583 cites W2131538664 @default.
- W1973792583 cites W2132436820 @default.
- W1973792583 cites W2138427406 @default.
- W1973792583 cites W2139793434 @default.
- W1973792583 cites W2140137657 @default.
- W1973792583 cites W2148664465 @default.
- W1973792583 cites W2149022481 @default.
- W1973792583 cites W2150541056 @default.
- W1973792583 cites W2162214076 @default.
- W1973792583 cites W2163163715 @default.
- W1973792583 cites W2167798908 @default.
- W1973792583 cites W2172692435 @default.
- W1973792583 cites W2767377409 @default.
- W1973792583 doi "https://doi.org/10.5194/acpd-8-6845-2008" @default.
- W1973792583 hasPublicationYear "2008" @default.
- W1973792583 type Work @default.
- W1973792583 sameAs 1973792583 @default.
- W1973792583 citedByCount "1" @default.
- W1973792583 crossrefType "posted-content" @default.
- W1973792583 hasAuthorship W1973792583A5003987428 @default.
- W1973792583 hasAuthorship W1973792583A5005940936 @default.
- W1973792583 hasAuthorship W1973792583A5010993723 @default.
- W1973792583 hasAuthorship W1973792583A5015340355 @default.
- W1973792583 hasAuthorship W1973792583A5021112220 @default.
- W1973792583 hasAuthorship W1973792583A5026304853 @default.
- W1973792583 hasAuthorship W1973792583A5036651287 @default.
- W1973792583 hasAuthorship W1973792583A5045617018 @default.
- W1973792583 hasAuthorship W1973792583A5045647259 @default.
- W1973792583 hasAuthorship W1973792583A5046558730 @default.