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Identifying And Resolving Artifacts Associated With Measurement And Characterization Of Light Absorbing Organic Aerosols, Nishit Shetty
Identifying And Resolving Artifacts Associated With Measurement And Characterization Of Light Absorbing Organic Aerosols, Nishit Shetty
McKelvey School of Engineering Theses & Dissertations
Atmospheric aerosols constitute a major short-lived climate pollutant which affects the Earth’s radiative budget by scattering and absorbing solar radiation. Carbonaceous aerosol (CA) emissions -especially those from fossil fuel and biomass combustion- contribute 20-90% of the total fine particulate mass and can absorb light in the visible and near ultraviolet (UV) wavelengths, underscoring their importance in climate forcing. CA emissions comprise of organic aerosols (OA) and black carbon (BC) – both co-emitted during a combustion event. Both constituents have significantly different optical properties owing to their formation mechanism. Further, they could exist in a variety of mixing states in the …
Optical And Physicochemical Properties Of Atmospherically Processed Brown Carbon Using Novel First-Principle Instrumentation, Benjamin Sumlin
Optical And Physicochemical Properties Of Atmospherically Processed Brown Carbon Using Novel First-Principle Instrumentation, Benjamin Sumlin
McKelvey School of Engineering Theses & Dissertations
Atmospheric processing of brown carbon (BrC) – a class of spherical, internally-mixed, light-absorbing organic aerosol – emitted from smoldering biomass combustion is an understudied phenomenon with implications for climate science, air quality models, and satellite retrieval algorithms. BrC aerosols have received significant attention as a strong contributor to atmospheric light absorption in the shorter visible wavelengths and a driver of UV photochemistry. Their complex refractive indices (m=n+ik), size distributions, and carbon oxidation states dictate their optical properties, atmospheric residence times, and chemical interactions, respectively. There is currently a gap in our understanding of these fundamental particle properties and their evolution …