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Immersion freezing efficiencies of ambient particles collected from five different regions across latitudes
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  • Naruki Hiranuma,
  • Brent Auvermann,
  • Franco Belosi,
  • David Cappelletti,
  • Kimberly Cory,
  • Manuel Dall'Osto,
  • Cory Davis,
  • Mauro Mazzola,
  • Reece McFarlin,
  • Joshua Mills,
  • Beatrice Moroni,
  • Matteo Rinaldi,
  • Cheyanne Rodriguez,
  • Zachary Salcido,
  • Rita Traversi,
  • Craig Whiteside,
  • Kai Zhang
Naruki Hiranuma
West Texas A&M University

Corresponding Author:nhiranuma@wtamu.edu

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Brent Auvermann
Texas A&M AgriLife Research - Amarillo
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Franco Belosi
National Research Council of Italy
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David Cappelletti
University of Perugia
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Kimberly Cory
West Texas A&M University
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Manuel Dall'Osto
Institute of Marine Sciences Barcelona
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Cory Davis
West Texas A&M University
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Mauro Mazzola
National Research Council of Italy
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Reece McFarlin
West Texas A&M University
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Joshua Mills
West Texas A&M University
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Beatrice Moroni
University of Perugia
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Matteo Rinaldi
National Research Council of Italy
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Cheyanne Rodriguez
West Texas A&M University
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Zachary Salcido
West Texas A&M University
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Rita Traversi
University of Florence
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Craig Whiteside
West Texas A&M University
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Kai Zhang
Pacific Northwest National Lab
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Abstract

This poster presents immersion freezing efficiencies of ambient particles collected from different latitudes between 79 °N and 75 °S. We collected particles using aerosol impactors at five different geographic locations, including i) the Atlantic sector of the Arctic, ii) an urban area in Europe, iii) a rural location in the U.S., iv) a mid-latitude agricultural site in the U.S., and v) the Antarctica peninsula area around Weddell Sea, representing unique particle episodes and atmospheric conditions. Then, we used an offline droplet-freezing assay instrument to measure fine-temperature-resolved ice-nucleating particle (INP) concentrations at T > -25 °C (with a detection capability of >0.0001 per L of air) for each region. Our preliminary results show INP concentrations in polar regions are - as expected - lower compared to mid-latitudes. Low concentrations of high-latitude INPs have been reported in other previous studies (e.g., Bigg et al., 2001; Rogers, 1996; Fountain and Ohtake, 1985; Mason et al., 2015; Ardon-Dryer and Levin, 2014; Belosi and Santachiara, 2014). Another important observation is the high variability of mid-latitude INP concentrations. A difference in the aerosol episode and properties may be key for such a high variability in the mid-latitude region. The composition of INPs varies, but it typically includes dust-related minerals, pollution aerosol, biogenic nuclei and marine microlayers. It is therefore important to comprehensively study realistic representation of both INP concentration and composition (ultimately for model parameterization) and their relevance to the aerosol-cloud interactions with a better temporal resolution under different atmospheric states and a wider spatial coverage of INP sampling sites (see Fig. 1). References: Ardon-Dryer, K. and Levin, Z.: Atmos. Chem. Phys., 14, 5217-5231, 2014. Belosi, F., and Santachiara, G.: Atmos. Res., 145–146, 105–111, 2014. Bigg, E. K.: Tellus B, 48, 223–233, 1996. Fountain, A. G., and Ohtake, T.: 1985: Climate Appl. Meteor., 24, 377–382, 1985. Mason, R. H. et al.: Atmos. Chem. Phys., 16, 1637–1651, 2016. Rogers, D. C. et al.: J. Atmos. Oceanic Technol., 18, 725–741, 2001.