KY EPSCoR: Heterogeneous Reaction of Ozone Depletion in the Atmosphere

Grants and Contracts Details

Description

During the aerosolization process at the sea surface, halides are incorporated into aerosol droplets, where they play a major role in tropospheric chemistry. Tropospheric ozone is thought to oxidize alkali halides in sea spray aerosols. This process may significantly contribute to the formation of reactive gas phase molecular halogens. Several environmental factors control how halides accommodate at the air-water interface. Our experiments are designed to simulate the process of sea spray aerosol formation using electrospray ionization (ESI) of 20-1000 nM equimolar solutions ofNaCl, NaBr, and Nal, among other ionic compounds. The microdroplets generated will be analyzed via mass spectrometry in order to study a possible correlation with ion properties such as size, hydration-energy, conductivity, and polarizability. The enrichment of larger anions produced during the fractionation of the bulk components will be explored as a function of temperature (20-500 °C). Countercation effects will be tested by substituting sodium ion with other alkali metals to represent the variable composition of surface waters. The comparative enrichment in the levels of bromide and iodide will be observed at the interface in processes that occur in a timescale of
StatusFinished
Effective start/end date2/5/132/4/14

Funding

  • KY Council on Postsecondary Education

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