Bioaerosols are the dominant source of warm-temperature immersion-mode INPs and drive uncertainties in INP predictability.

Autor: Cornwell GC; Atmospheric Science and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA.; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA., McCluskey CS; Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA.; National Center for Atmospheric Research, Boulder, CO 80305, USA., Hill TCJ; Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA., Levin ET; Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA., Rothfuss NE; Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27605, USA., Tai SL; Atmospheric Science and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA., Petters MD; Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27605, USA., DeMott PJ; Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA., Kreidenweis S; Department of Atmospheric Science, Colorado State University, Fort Collins, CO 80523, USA., Prather KA; Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA.; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92037, USA., Burrows SM; Atmospheric Science and Global Change Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2023 Sep 15; Vol. 9 (37), pp. eadg3715. Date of Electronic Publication: 2023 Sep 15.
DOI: 10.1126/sciadv.adg3715
Abstrakt: Ice-nucleating particles (INPs) are rare atmospheric aerosols that initiate primary ice formation, but accurately simulating their concentrations and variability in large-scale climate models remains a challenge. Doing so requires both simulating major particle sources and parameterizing their ice nucleation (IN) efficiency. Validating and improving model predictions of INP concentrations requires measuring their concentrations delineated by particle type. We present a method to speciate INP concentrations into contributions from dust, sea spray aerosol (SSA), and bioaerosol. Field campaign data from Bodega Bay, California, showed that bioaerosols were the primary source of INPs between -12° and -20°C, while dust was a minor source and SSA had little impact. We found that recent parameterizations for dust and SSA accurately predicted ambient INP concentrations. However, the model did not skillfully simulate bioaerosol INPs, suggesting a need for further research to identify major factors controlling their emissions and INP efficiency for improved representation in models.
Databáze: MEDLINE
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