| Autor: |
Franklin EB; Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, California94720, United States., Amiri S; Scripps Institution of Oceanography, University of California San Diego, La Jolla, California92093, United States., Crocker D; Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, California92093, United States., Morris C; Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, California92093, United States., Mayer K; Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, California92093, United States., Sauer JS; Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, California92093, United States., Weber RJ; Department of Environmental Science, Policy and Management, University of California, Berkeley, Berkeley, California94720, United States., Lee C; Scripps Institution of Oceanography, University of California San Diego, La Jolla, California92093, United States., Malfatti F; Scripps Institution of Oceanography, University of California San Diego, La Jolla, California92093, United States.; Department of Life Sciences, University of Trieste, Trieste34100, Italy., Cappa CD; Department of Civil and Environmental Engineering, University of California Davis, Davis, California95616, United States., Bertram TH; Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin53706, United States., Prather KA; Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, California92093, United States.; Scripps Institution of Oceanography, University of California San Diego, La Jolla, California92093, United States., Goldstein AH; Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, California94720, United States.; Department of Environmental Science, Policy and Management, University of California, Berkeley, Berkeley, California94720, United States. |
| Abstrakt: |
The organic composition of coastal sea spray aerosol is important for both atmospheric chemistry and public health but remains poorly characterized. Coastal waters contain an organic material derived from both anthropogenic processes, such as wastewater discharge, and biological processes, including biological blooms. Here, we probe the chemical composition of the organic fraction of sea spray aerosol over the course of the 2019 SeaSCAPE mesocosm experiment, in which a phytoplankton bloom was facilitated in natural coastal water from La Jolla, California. We apply untargeted two-dimensional gas chromatography to characterize submicron nascent sea spray aerosol samples, reporting ∼750 unique organic species traced over a 19 day phytoplankton bloom experiment. Categorization and quantitative compositional analysis reveal three major findings. First, anthropogenic species made up 30% of total submicron nascent sea spray aerosol organic mass under the pre-bloom condition. Second, biological activity drove large changes within the aerosolized carbon pool, decreasing the anthropogenic mass fraction by 89% and increasing the biogenic and biologically transformed fraction by a factor of 5.6. Third, biogenic marine organics are underrepresented in mass spectral databases in comparison to marine organic pollutants, with more than twice as much biogenic aerosol mass attributable to unlisted compounds. |
