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Title: Condensed-phase biogenic–anthropogenic interactions with implications for cold cloud formation

Anthropogenic and biogenic gas emissions contribute to the formation of secondary organic aerosol (SOA). When present, soot particles from fossil fuel combustion can acquire a coating of SOA. We investigate SOA–soot biogenic–anthropogenic interactions and their impact on ice nucleation in relation to the particles’ organic phase state. SOA particles were generated from the OH oxidation of naphthalene, α-pinene, longifolene, or isoprene, with or without the presence of sulfate or soot particles. Corresponding particle glass transition (T g) and full deliquescence relative humidity (FDRH) were estimated using a numerical diffusion model. Longifolene SOA particles are solid-like and all biogenic SOA sulfate mixtures exhibit a core–shell configuration (i.e.a sulfate-rich core coated with SOA). Biogenic SOA with or without sulfate formed ice at conditions expected for homogeneous ice nucleation, in agreement with respectiveT gand FDRH. α-pinene SOA coated soot particles nucleated ice above the homogeneous freezing temperature with soot acting as ice nuclei (IN). At lower temperatures the α-pinene SOA coating can be semisolid, inducing ice nucleation. Naphthalene SOA coated soot particles acted as ice nuclei above and below the homogeneous freezing limit, which can be explained by the presence of a highly viscous SOA phase. Our results suggest that biogenic SOA doesmore » not play a significant role in mixed-phase cloud formation and the presence of sulfate renders this even less likely. However, anthropogenic SOA may have an enhancing effect on cloud glaciation under mixed-phase and cirrus cloud conditions compared to biogenic SOA that dominate during pre-industrial times or in pristine areas.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ORCiD logo [2] ;  [6] ;  [7] ;  [8] ;  [9] ;  [5] ; ORCiD logo [1]
  1. Stony Brook Univ., NY (United States). Inst. for Terrestrial and Planetary Atmospheres, School of Marine and Atmospheric Sciences
  2. Boston College, Chestnut Hill, MA (United States). Dept. of Chemistry; Aerodyne Research Inc., Billerica, MA (United States)
  3. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemical and Biomolecular Engineering
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of the Pacific, Stockton, CA (United States). Dept. of Chemistry
  5. Aerodyne Research Inc., Billerica, MA (United States)
  6. Univ. of California, Irvine, CA (United States). Dept. of Chemistry
  7. Univ. of the Pacific, Stockton, CA (United States). Dept. of Chemistry
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
  9. Boston College, Chestnut Hill, MA (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
AC02-05CH11231; SC0016370; SC0008613; SC0006980; SC0011935
Type:
Accepted Manuscript
Journal Name:
Faraday Discussions
Additional Journal Information:
Journal Volume: 200; Journal ID: ISSN 1359-6640
Publisher:
Royal Society of Chemistry
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1436142