Environ Sci Technol 2021 Jul 14. Epub 2021 Jul 14.
Department of Chemistry, University of Toronto, Toronto M5S 3H6, Ontario, Canada.
While aerosol pH is among the most important parameters in atmospheric chemistry, it can be challenging to have a priori knowledge of the factors that are most strongly influencing the pH in a specific environment. In this study, we present a calculation method to more intuitively quantify the relationship between aerosol pH and its influencing factors, including gaseous NH concentration, particle properties, relative humidity, temperature, and nonvolatile cations, based on the NH phase-partitioning equilibrium used in the E-AIM thermodynamic model. The applications of this calculation framework include (1) expressing the pH values directly as the function of influencing factors, (2) quantitatively studying the contribution of different factors to pH value changes, and (3) decomposing the standard deviation of pH values to find the dominant influencing factors on total pH fluctuations. Read More