BRIDGING AEROSOL REPRESENTATIONS ACROSS SCALES WITH PHYSICS-INFORMED STATISTICAL LEARNING
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Patel, Lekha↗
Engineering topics
Riemer, Nicole
Publications and source records attributed to Riemer, Nicole.
Exploring the temperature- and humidity-dependent viscous properties of organic and mixed organic-inorganic aerosol particles: impacts on water diffusion and interpreting chamber studies
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Davis, Ryan↗
The state of the aerosol: Musings on mixing state
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54 ENVIRONMENTAL SCIENCES↗
Black Carbon Absorption at the Global Scale Is Affected by Particle-Scale Diversity in Composition
Atmospheric black carbon (BC) exerts a strong, but uncertain, warming effect on the climate. BC that is coated with non-absorbing material absorbs more strongly than the same amount of BC in an uncoated particle, but the magnitude of this absorption enhancement (E(sub abs)) is not well constrained. Modelling studies and laboratory measurements have found stronger absorption enhancement than has been observed in the atmosphere. Here, using a particle-resolved aerosol model to simulate diverse BC populations, we show that absorption is overestimated by as much as a factor of two if diversity is neglected and population-averaged composition is assumed across all BC-containing particles. If, instead, composition diversity is resolved, we find E(sub abs) = 1 - 1.5 at low relative humidity, consistent with ambient observations. This study offers not only an explanation for the discrepancy between modelled and observed absorption enhancement, but also demonstrates how particle-scale simulations can be used to develop relationships for global-scale models.
Climate models↗