A study of wood burning and traffic aerosols in an Alpine valley using a multi-wavelength Aethalometer

The "dual-spot" Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation

“…The compensation parameter f values were obtained by minimizing the discontinuities in b abs across tape advances (f 1 = 1.319, f 2 = 1.288, f 3 = 1.244, f 4 = 1.213, f 5 = 1.213, f 6 = 1.203, f 7 = 1.203). As previously found (e.g., Sandradewi et al, 2008a), larger f values were obtained for shorter wavelengths although the b abs (ATN) method shows a somewhat smaller loading effect for that Figure 5. Filter loading effect characterization for AE31 using a quartz filter before (raw data) and after loading effect compensation during the Klagenfurt campaign.…”

Real-Time Performance of the microAeth® AE51 and the Effects of Aerosol Loading on Its Measurement Results at a Traffic Site

“…They have been used extensively to monitor environmental BC levels because of their ease of operation, and favorable time resolution (Watson et al, 2005;Park et al, 2006;Chow et al, 2009). Such online measurement instruments are critical to research studies that seek to characterize short-term and/or long-term variability in BC levels, such as by measuring source emissions that change rapidly, comparing time-varying outdoor/indoor air pollution levels, or observing dynamic trends in ambient air quality (Badarinath and Latha, 2006;Fruin et al, 2008;Rodríguez et al, 2008;Sandradewi et al, 2008;Dutkiewicz et al, 2009;Wang et al, 2009;Snyder et al, 2010;Boogaard et al, 2011;Hyvärinen et al, 2011;Reche et al, 2011;Viana et al, 2011;Wang et al, 2011;Reddy et al, 2012;Wang et al, 2012;Cheng et al, 2013). They also could be used to evaluate the light absorption coefficient of aerosol by measuring the attenuation of light through deposited aerosol (Lavanchy et al, 1999;Weingartner et al, 2003;Arnott et al, 2005;Fialho et al, 2005;Schmid et al, 2006).…”

Ambient PM2.5, Black Carbon, and Particle Size-Resolved Number Concentrations and the Ångström Exponent Value of Aerosols during the Firework Display at the Lantern Festival in Southern Taiwan

“…Kirchstetter et al (2004) noted that the absorption Ångström exponent value ranged between 0.8 and 1.1 for diesel soot, and Day et al (2006) found that the absorption Ångström exponent values for fresh wood smoke aerosol were between 0.9 and 2.2 and strongly dependent on the type of wood and burning conditions. Sandradewi et al (2008) observed that the absorption Ångström exponent values for vehicular traffic and wood burning were 1.1 and in the range of 1.8-1.9, respectively; a high absorption Ångström exponent value was observed for wood combustion aerosol because the aerosol was bound to compounds showing strong absorption in the ultraviolet region. Fig.…”

“…The absorption Ångström exponent has been used as an index for determining the types of BC emission sources (Kirchstetter et al, 2004;Day et al, 2006;Sandradewi et al, 2008). Kirchstetter et al (2004) noted that the absorption Ångström exponent value ranged between 0.8 and 1.1 for diesel soot, and Day et al (2006) found that the absorption Ångström exponent values for fresh wood smoke aerosol were between 0.9 and 2.2 and strongly dependent on the type of wood and burning conditions.…”

“…This finding points to the abundance of organic compounds in the particles released into the atmosphere during a forest fire. In the current study, the BC mass concentrations determined at the wavelengths of 370 and 880 nm were treated as ultraviolet black carbon (UVBC) and BC, respectively, to distinguish particles bound to ultraviolet-absorbing organic compounds (Wu et al, 2007;Sandradewi et al, 2008;Wang et al, 2011;Cheng et al, 2014). Furthermore, BC mass concentrations evaluated at the wavelengths of 470 and 950 nm were used to determine the absorption Ångström exponent, which can be used as an index to identify the types of BC emission sources (Kirchstetter et al, 2004;Day et al, 2006;Sandradewi et al, 2008).…”