Presentation Information
[AAS08-P55]Analysis of HO2 uptake coefficients onto liquid-liquid phase separated (LLPS) aerosols based on a resistor model
*Yosuke Sakamoto1, Yu Morino1, Kei Sato1 (1.National Institute for Environmental Studies)
Keywords:
troposphere,ROx radical,Aerosols,Heterogeneous reactions
Uptake of gas-phase oxidants by aerosols alters aerosol composition and suppresses the formation of atmospheric pollutants, such as ozone and secondary organic aerosols (SOA), by inhibiting gas-phase oxidation. Quantifying these heterogeneous uptake processes is essential for developing accurate climate change and air quality prediction models. HO2 is an oxidant, interacts with aerosols, and its uptake is governed by intra-particle reactions due to its high reactivity.
While past studies focused on single-phase aerosols, research over the last decade has revealed that atmospheric aerosols can undergo liquid-liquid phase separation (LLPS) into two layers with an inorganic core and an organic shell morphology depending on relative humidity. Analytical equations based on the resistor model, approximating steady-state conditions, are effective for identifying the rate-limiting factors in uptake processes.
In this presentation, we derive an analytical equation for the HO2 uptake coefficient in LLPS systems based on the resistor model and investigate the physical and chemical factors that influence the uptake efficiency. To avoid complexity in the analytical expressions, the discussion assumes aerosols containing transition metal ions and is conducted under pseudo-first-order reaction conditions.
While past studies focused on single-phase aerosols, research over the last decade has revealed that atmospheric aerosols can undergo liquid-liquid phase separation (LLPS) into two layers with an inorganic core and an organic shell morphology depending on relative humidity. Analytical equations based on the resistor model, approximating steady-state conditions, are effective for identifying the rate-limiting factors in uptake processes.
In this presentation, we derive an analytical equation for the HO2 uptake coefficient in LLPS systems based on the resistor model and investigate the physical and chemical factors that influence the uptake efficiency. To avoid complexity in the analytical expressions, the discussion assumes aerosols containing transition metal ions and is conducted under pseudo-first-order reaction conditions.