Density and Homogeneous Internal Composition of Primary Brown Carbon Aerosol

Environmental Science & Technology
Benjamin J SumlinRajan K Chakrabarty

Abstract

The presence of atmospheric brown carbon (BrC) has been the focus of many recent studies. These particles, predominantly emitted from smoldering biomass burning, absorb light in the near-ultraviolet and short visible wavelengths and offset the radiative cooling effects associated with organic aerosols. Particle density dictates their transport properties and is an important parameter in climate models and aerosol instrumentation algorithms, but our knowledge of this particle property is limited, especially as functions of combustion temperature and fuel type. We measured the effective density (ρeff) and optical properties of primary BrC aerosol emitted from smoldering combustion of Boreal peatlands. Energy transfer into the fuel was controlled by selectively altering the combustion ignition temperature, and we find that the particle ρeff ranged from 0.85 to 1.19 g cm-3 corresponding to ignition temperatures from 180 to 360 °C. BrC particles exhibited spherical morphology and a constant 3.0 mass-mobility exponent, indicating no internal microstructure or void spaces. Upon partial thermal volatilization, ρeff of the remaining particle mass was confined to a narrow range between 0.9 and 1.1 g cm-3. These findings lead us to conclu...Continue Reading

References

Mar 13, 2003·Environmental Science & Technology·Kihong ParkPeter H McMurry
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Citations

Jul 21, 2020·Environmental Science. Processes & Impacts·Poonam BikkinaS Kuswanth Kumar
Dec 25, 2019·Applied Optics·Li Liu, Michael I Mishchenko
Mar 17, 2021·The Science of the Total Environment·Long PengGuoying Sheng

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