Abstract
The spectral light-absorbing behavior of carbonaceous aerosols varies depending on the chemical composition and structure of the particles. A new single-cavity three-wavelength photoacoustic spectrometer was developed and characterized for measuring absorption coefficients at three wavelengths across the visible spectral range. In laboratory studies, several types of soot with different organic content were generated by a diffusion flame burner and were investigated for changes in mass-specific absorption cross section (MAC) values, absorption and scattering Ångström exponents (αabs and αsca), and single scattering albedo (‰). By increasing the organic carbonaceous (OC) content of the aerosol from 50 to 90g % of the total carbonaceous mass, for 660g nm nearly no change of MAC was found with increasing OC content. In contrast, for 532g nm a significant increase, and for 445g nm a strong increase of MAC was found with increasing OC content of the aerosol. Depending on the OC content, the Ångström exponents of absorption and scattering as well as the single scattering albedo increased. These laboratory results were compared to a field study at a traffic-dominated urban site, which was also influenced by residential wood combustion. For this site a daily average value of αabs(445-660) of 1.9 was found.
| Original language | English |
|---|---|
| Pages (from-to) | 5331-5346 |
| Number of pages | 16 |
| Journal | Atmospheric Measurement Techniques |
| Volume | 9 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 7 Nov 2016 |
Funding
This work was funded by the Helmholtz-Gemeinschaft Deutscher Forschungszentren as part of the program "Atmosphere and Climate" and a start-up budget of the "KIT Kompetenzbereich Erde und Umwelt". The SP-2 and the development of the PAS were funded by the HGF Ausbauinvestition ATMONSYS. We thank the AIDA team and especially Georg Scheurig, Thomasz Chudy, and Steffen Vogt for their technical support. We would like to thank Reiner Gebhardt (IfGG, KIT) who installed the cabin and facilities at Durlacher Tor. We gratefully acknowledge Otmar Schmid (formerly Max Planck Institute for Chemistry), Uli Poschl (Max Planck Institute for Chemistry), and the Max Planck Society for their support.
Austrian Fields of Science 2012
- 105105 Geochemistry
- 103039 Aerosol physics
Keywords
- LIGHT-ABSORPTION MEASUREMENTS
- AMBIENT BLACK CARBON
- OPTICAL-PROPERTIES
- BROWN CARBON
- SPECTRAL DEPENDENCE
- ELEMENTAL CARBON
- ORGANIC-CARBON
- PARTICULATE MATTER
- BIOMASS COMBUSTION
- CROSS-SECTION
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