Ice nucleation activity of diesel soot particles at cirrus relevant temperature conditions: Effects of hydration, secondary organics coating, soot morphology, and coagulation

Journal Article · Tue Apr 12 00:00:00 EDT 2016 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2016GL068707· OSTI ID:1402236

Kulkarni, Gourihar ^[1]; China, Swarup ^[2]; Liu, Shang ^[3]; Nandasiri, Manjula ^[4]; Sharma, Noopur ^[5]; Wilson, Jacqueline ^[6]; Aiken, Allison C. ^[7]; Chand, Duli ^[1]; Laskin, Alexander ^[4]; Mazzoleni, Claudio ^[5]; Pekour, Mikhail ^[1]; Shilling, John ^[1]; Shutthanandan, Vaithiyalingam ^[4]; Zelenyuk, Alla ^[6]; Zaveri, Rahul A. ^[1]

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1. Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland Washington USA
2. Atmospheric Sciences Program and Physics Department Michigan Technological University Houghton Michigan USA, Now at Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland Washington USA
3. Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos New Mexico USA, Now at Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder Colorado USA
4. Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland Washington USA
5. Atmospheric Sciences Program and Physics Department Michigan Technological University Houghton Michigan USA
6. Chemical Physics and Analysis Pacific Northwest National Laboratory Richland Washington USA
7. Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos New Mexico USA

Abstract Ice formation by diesel soot particles was investigated at temperatures ranging from −40 to −50°C. Size‐selected soot particles were physically and chemically aged in an environmental chamber, and their ice nucleating properties were determined using a continuous flow diffusion type ice nucleation chamber. Bare (freshly formed), hydrated, and compacted soot particles, as well as α ‐pinene secondary organic aerosol (SOA)‐coated soot particles at high relative humidity conditions, showed ice formation activity at subsaturation conditions with respect to water but below the homogeneous freezing threshold conditions. However, SOA‐coated soot particles at dry conditions were observed to freeze at homogeneous freezing threshold conditions. Overall, our results suggest that heterogeneous ice nucleation activity of freshly emitted diesel soot particles are sensitive to some of the aging processes that soot can undergo in the atmosphere.

• Sponsoring Organization: USDOE
• Grant/Contract Number: DE‐SC0010019
• OSTI ID: 1402236
• Journal Information: Geophysical Research Letters, Journal Name: Geophysical Research Letters Vol. 43 Journal Issue: 7; ISSN 0094-8276
• Publisher: American Geophysical Union (AGU)
• Country of Publication: United States
• Language: English