Abstract
Abstract. Properties of atmospheric black carbon (BC) particles were characterized during a field experiment at a rural background site (Melpitz, Germany) in February 2017. BC absorption at a wavelength of 870 nm was measured by a photoacoustic extinctiometer, and BC physical properties (BC mass concentration, core size distribution and coating thickness) were measured by a single-particle soot photometer (SP2). Additionally, a catalytic stripper was used to intermittently remove BC coatings by alternating between ambient and thermo-denuded conditions. From these data the mass absorption cross section of BC (MACBC) and its enhancement factor (EMAC) were inferred for essentially water-free aerosol as present after drying to low relative humidity (RH). Two methods were applied independently to investigate the coating effect on EMAC: a correlation method (MACBC, ambient vs. BC coating thickness) and a denuding method (MACBC, ambient vs. MACBC, denuded). Observed EMAC values varied from 1.0 to 1.6 (lower limit from denuding method) or ∼1.2 to 1.9 (higher limit from correlation method), with the mean coating volume fraction ranging from 54 % to 78 % in the dominating mass equivalent BC core diameter range of 200–220 nm. MACBC and EMAC were strongly correlated with coating thickness of BC. By contrast, other potential drivers of EMAC variability, such as different BC sources (air mass origin and absorption Ångström exponent), coating composition (ratio of inorganics to organics) and BC core size distribution, had only minor effects. These results for ambient BC measured at Melpitz during winter show that the lensing effect caused by coatings on BC is the main driver of the variations in MACBC and EMAC, while changes in other BC particle properties such as source, BC core size or coating composition play only minor roles at this rural background site with a large fraction of aged particles. Indirect evidence suggests that potential dampening of the lensing effect due to unfavorable morphology was most likely small or even negligible.
Highlights
Black carbon (BC), which commonly refers to graphitic elemental carbon (Petzold et al, 2013), is a major component of atmospheric aerosols
Indirect evidence suggests that potential dampening of the lensing effect due to unfavorable morphology was most likely small or even negligible
The PM1 aerosol mass concentration from integrated aerosol chemical speciation monitor (ACSM) and SP2 (BC) showed the highest levels observed during the whole campaign period, with a median mass concentration of 23.0 (IQR 20.4–27.2) μg m−3
Summary
Black carbon (BC), which commonly refers to graphitic elemental carbon (Petzold et al, 2013), is a major component of atmospheric aerosols. BC is highly refractory, insoluble and a strong light absorber across the whole solar spectrum (Corbin et al, 2019). The latter makes BC the dominant light-absorbing component of atmospheric aerosols and causes a substantial positive radiative forcing through aerosol–radiation interactions (Bond et al, 2013). Two parameters are required to quantify the light absorption coefficient of BC (bap, BC; [Mm−1]) in climate models: the mass absorption cross section of black carbon J. Yuan et al.: Variability in the mass absorption cross section of black carbon (BC) aerosols [m2 g−1]) and the BC mass concentration (mBC; [μg m−3]), as shown in Eq (1), bap, BC = MACBC × mBC
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