Fine-particle water and pH in the southeastern United States

Abstract. Particle water and pH are predicted using meteorological observations (relative humidity (RH), temperature (T)), gas/particle composition, and thermodynamic modeling (ISORROPIA-II). A comprehensive uncertainty analysis is included, and the model is validated. We investigate mass concentrations of particle water and related particle pH for ambient fine-mode aerosols sampled in a relatively remote Alabama forest during the Southern Oxidant and Aerosol Study (SOAS) in summer and at various sites in the southeastern US during different seasons, as part of the Southeastern Center for Air Pollution and Epidemiology (SCAPE) study. Particle water and pH are closely linked; pH is a measure of the particle H+…

• NS
  National Science Foundation
• UE
  U.S. Environmental Protection Agency
• OO
  Office of Research and Development
• GI
  Georgia Institute of Technology
• EP
  Environmental Protection Agency

  Awards: R835410, R834799
• NO
  National Oceanic and Atmospheric Administration

  Award: NA10OAR4310102
• OR
  Oak Ridge Institute for Science and Education
• DO
  Division of Atmospheric and Geospace Sciences

  Awards: 1241498, 1242258