Hydrogen chloride (HCl) at ground sites during CalNex 2010 and insight into its thermodynamic properties.

ABSTRACT: Gas phase hydrogen chloride (HCl) was measured at Pasadena and San Joaquin Valley (SJV) ground sites in California during May and June 2010 as part of the CalNex study. Observed mixing ratios were on average 0.83 ppbv at Pasadena, ranging from below detection limit (0.055 ppbv) to 5.95 ppbv, and were on average 0.084 ppbv at SJV with a maximum value of 0.776 ppbv. At both sites, HCl levels were highest during midday and shared similar diurnal variations with HNO₃. Coupled phase partitioning behavior was found between HCl/Cl^- and HNO₃/NO₃ ^- using thermodynamic modelling and observations. Regional modeling of Cl^- and HCl using CMAQ captures some of the observed relationships but underestimates measurements by a factor of 5 or

SUBMITTER: Tao Y 

PROVIDER: S-EPMC9109133 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature