Bringing the ocean into the laboratory to probe the chemical complexity of sea spray aerosol

Kimberly A. Prather*, Timothy H. Bertram, Vicki H. Grassian, Grant B. Deane, M. Dale Stokes, Paul J. DeMott, Lihini I. Aluwihare, Brian P. Palenik, Farooq Azam, John H. Seinfeld, Ryan C. Moffet, Mario J. Molina, Christopher D. Cappa, Franz M. Geiger, Gregory C. Roberts, Lynn M. Russell, Andrew P. Ault, Jonas Baltrusaitis, Douglas B. Collins, Craig E. CorriganLuis A. Cuadra-Rodriguez, Carlena J. Ebben, Sara D. Forestieri, Timothy L. Guasco, Scott P. Hersey, Michelle J. Kim, William F. Lambert, Robin L. Modini, Wilton Mui, Byron E. Pedler, Matthew J. Ruppel, Olivia S. Ryder, Nathan G. Schoepp, Ryan C. Sullivan, Defeng Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

272 Scopus citations

Abstract

The production, size, and chemical composition of sea spray aerosol (SSA) particles strongly depend on seawater chemistry, which is controlled by physical, chemical, and biological processes. Despite decades of studies in marine environments, a direct relationship has yet to be established between ocean biology and the physicochemical properties of SSA. The ability to establish such relationships is hindered by the fact that SSA measurements are typically dominated by overwhelming background aerosol concentrations even in remote marine environments. Herein, we describe a newly developed approach for reproducing the chemical complexity of SSA in a laboratory setting, comprising a unique ocean-atmosphere facility equipped with actual breaking waves. A mesocosm experiment was performed in natural seawater, using controlled phytoplankton and heterotrophic bacteria concentrations, which showed SSA size and chemical mixing state are acutely sensitive to the aerosol production mechanism, as well as to the type of biological species present. The largest reduction in the hygroscopicity of SSA occurred as heterotrophic bacteria concentrations increased, whereas phytoplankton and chlorophyll-a concentrations decreased, directly corresponding to a change in mixing state in the smallest (60-180 nm) size range. Using this newly developed approach to generate realistic SSA, systematic studies can now be performed to advance our fundamental understanding of the impact of ocean biology on SSA chemical mixing state, heterogeneous reactivity, and the resulting climaterelevant properties.

Original languageEnglish (US)
Pages (from-to)7550-7555
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number19
DOIs
StatePublished - May 7 2013

Keywords

  • Biologically active
  • Cloud condensation nuclei
  • Clouds
  • Ice nucleation
  • Marine aerosols

ASJC Scopus subject areas

  • General

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