Organic matter in central California radiation fogs

Pierre Herckes, Taehyoung Lee, Laurie Trenary, Gongunn Kang, Hui Chang, Jeffrey L. Collett

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


Organic matter was studied in radiation fogs in the San Joaquin Valley of California during the California Regional Particulate Air Quality Study (CRPAQS). Total organic carbon (TOC) concentrations ranged from 2 to 40 ppm of C. While most organic carbon was found in solution as dissolved organic carbon (DOC), 23% on average was not dissolved inside the fog drops. We observe a clear variation of organic matter concentration with droplet size. TOC concentrations in small fog drops (<17 μm) were a factor of 3, on average, higher than TOC concentrations in larger drops. As much as half of the dissolved organic matter was determined to have a molecular weight higher than 500 Da. Deposition fluxes of organic matter in fog drops were high (0.5-4.3 μg of C m-2 min-1), indicating the importance of fog processing as a vector for removal of organic matter from the atmosphere. Deposition velocities of organic matter, however, were usually found to be lower than deposition velocities for fogwater, consistent with the enrichment of the organic matter in smaller fog drops with lower terminal settling velocities.

Original languageEnglish (US)
Pages (from-to)4777-4782
Number of pages6
JournalEnvironmental Science and Technology
Issue number22
StatePublished - Nov 15 2002
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry


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