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Dataset / Data from: Ice-nucleating particles near two major dust source regions

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Data from: Ice-nucleating particles near two major dust source regions
Andreae, Meinrat O
Prather, Kimberly A
Beall, Charlotte M
Date Created and/or Issued
Time period of project: 2017-06-28 to 2021-08-20
Contributing Institution
UC San Diego, Research Data Curation Program
Center for Aerosol Impacts on Chemistry of the Environment (CAICE)
Rights Information
Under copyright
Constraint(s) on Use: This work is protected by the U.S. Copyright Law (Title 17, U.S.C.). Use of this work beyond that allowed by "fair use" or any license applied to this work requires written permission of the copyright holder(s). Responsibility for obtaining permissions and any use and distribution of this work rests exclusively with the user and not the UC San Diego Library. Inquiries can be made to the UC San Diego Library program having custody of the work.
Use: This work is available from the UC San Diego Library. This digital copy of the work is intended to support research, teaching, and private study.
Rights Holder and Contact
UC Regents
Publication abstract: Mineral dust and sea spray aerosol are important sources of ice nucleating particles (INPs), the small fraction of aerosol particles able to trigger cloud ice crystal formation and consequently, influence multiple climate-relevant cloud properties including lifetime, reflectivity and precipitation efficiency. Mineral dust is considered the dominant INP source in many parts of the world due to its ice nucleation efficiency and its sheer abundance, with global emission rates of up to 4700 Tg a-1. However, INPs emitted from the ocean surface via sea spray aerosol frequently dominate INP populations in remote marine environments, including parts of the Southern Ocean where cloud-resolving model simulations have demonstrated that cloud reflectivity is likely strongly controlled by INPs. Here we report INP concentrations measured in aerosol and seawater samples during Air Quality and Climate Change in the Arabian BAsin (AQABA), a shipborne campaign that spanned the Red Sea, Gulf of Aden, Arabian Sea, Arabian Gulf and part of the Mediterranean. In aerosol samples collected within a few hundred kilometers of the first and second ranked sources of dust globally, the Sahara and Arabian Peninsula, INP concentrations ranged from 0.2 to 11 L-1 at -20 °C with observed ice nucleation site densities (ns) 1-3 orders of magnitude below levels predicted by mineral dust INP parameterizations. Over half of the samples (at least 14 of 26) were collected during dust storms with average dust mass concentrations between 150 and 490 μg m-3. The impacts of heat and peroxide treatments indicate that the observed INPs were organic in composition at temperatures ≥ -15 °C with proteinaceous (heat-labile) INPs frequently observed at higher freezing temperatures > -10 °C. Overall, results demonstrate that despite proximity to the Sahara and the Arabian Peninsula and the dominance of mineral dust in the aerosol sampled, existing mineral dust parameterizations alone would not skillfully represent the near-surface ns in the observed temperature regime (-6 to -25 °C). This study underscores the need for measurements of ns and organic composition in characteristic soil dust samples from N. Africa and the Arabian Peninsula. Future efforts to develop representations of dust INPs at high temperatures (> -15 °C) would benefit from improved understanding of the organic species associated with IN-activity, the extent to which the organic contribution to IN-activity varies across source regions, and whether the ns approach is appropriate or whether an alternative approach is required for skillful representation of dust INPs in this sensitive temperature regime.
Research Data Curation Program, UC San Diego, La Jolla, 92093-0175 (
Beall, Charlotte, M.; Hill, Thomas C. J.; DeMott, Paul J.; Könemann, Tobias; Pikridas, Michael; Drewnick, Frank; Harder, Hartwig; Pöhlker, Christopher; Lelieveld, Jos; Weber, Bettina; Iakovides, Minas; Prokes, Roman; Sciare, Jean; Andreae, Meinrat O.; Stokes, M. Dale; Prather, Kimberly A. (2022). Data from: Ice-nucleating Particles Near Two Major Dust Source Regions. In Center for Aerosol Impacts on Chemistry of the Environment (CAICE). UC San Diego Library Digital Collections.
Ice Nucleating Particles (INPs)
Sea spray aerosol (SSA)

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