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https://doi.org/10.5194/acp-2020-783
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-783
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  14 Aug 2020

14 Aug 2020

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This preprint is currently under review for the journal ACP.

Measurement report: Ice nucleating abilities of biomass burning, African dust, and sea spray aerosol particles over the Yucatan Peninsula

Fernanda Córdoba1,2,, Carolina Ramirez-Romero1,3,, Diego Cabrera1, Graciela B. Raga1, Javier Miranda4, Harry Alvarez-Ospina5, Daniel Rosas6, Bernardo Figueroa7, Jong S. Kim8, Jacqueline Yakobi-Hancock8, Talib Amador6, Wilfrido Gutierrez1, Manuel Garcia1, Allan K. Bertram9, Darrel Baumgardner10, and Luis A. Ladino1 Fernanda Córdoba et al.
  • 1Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City, Mexico
  • 2Posgrado en Ciencias Química, Universidad Nacional Autónoma de México, Mexico City, Mexico
  • 3Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, Mexico City, Mexico
  • 4Instituto de Física, Universidad Nacional Autónoma de México, Mexico City, Mexico
  • 5Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City, Mexico
  • 6Facultad de Química, Universidad Autónoma de Yucatán, Mérida, Mexico
  • 7Instituto de Ingeniería, Unidad Académica de Sisal, Universidad Nacional Autónoma de México, Sisal, Mexico
  • 8Dalhousie University, Halifax, Nova Scotia, Canada
  • 9Chemistry Department, University of British Columbia, Vancouver, Canada
  • 10Droplet Measurement Technologies, Colorado, USA
  • These authors contributed equally to this work.

Abstract. Most precipitation from deep clouds over the continents and in the intertropical convergence zone is strongly influenced by the presence of ice crystals, whose formation requires the presence of ice nucleating particles (INP). Although there are a large number of INP sources, the ice nucleating abilities of aerosol particles emitted from oceans, deserts, and wildfires are poorly described at tropical latitudes. To fill this gap in knowledge, the UNAM-MicroOrifice Uniform Deposit Impactor-Droplet Freezing Technique (UNAM-MOUDI-DFT) was built. Aerosol samples were collected in Sisal and Merida, Yucatan (Mexico) under the influence of cold fronts, biomass burning (BB), and African dust (AD), during five short-term field campaigns between January 2017 and July 2018.

The three different aerosol types were distinguished by characterizing their physicochemical properties. Marine aerosol (MA), BB, and AD air masses were found to contain INP; the highest concentrations were found for AD (from 0.071 L−1 to 36.07 L−1), followed by MA (from 0.068 L−1 to 18.90 L−1), and BB (from 0.063 L−1 to 10.21 L−1). However, MA had the highest surface active site density (ns) between −15 °C and −30 °C. Additionally, supermicron particles contributed more than 72 % of the total INP concentration independent of aerosol type; MA had the largest contribution from supermicron particles.

Fernanda Córdoba et al.

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Short summary
Most precipitation from deep clouds over the continents and in the intertropical convergence zone is strongly influenced by the presence of ice crystals, whose formation requires the presence of aerosol particles. In the present study the ability of three different aerosol types (i.e., marine aerosol, biomass burning, and African dust) to facilitate ice particle formation was assessed in the Yucatan Peninsula, Mexico.
Most precipitation from deep clouds over the continents and in the intertropical convergence...
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