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Discussion papers
https://doi.org/10.5194/acp-2018-1215
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1215
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Dec 2018

Research article | 06 Dec 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

The Importance of Biological Particles to the Ice Nucleating Particle Concentration in a Coastal Tropical Site

Luis A. Ladino1, Graciela B. Raga1, Harry Alvarez-Ospína2, Manuel A. Andino-Enríquez3, Irma Rosas1, Eva Salinas1, Leticia Martínez1, Javier Miranda4, Zyanya Ramírez-Díaz1, Bernardo Figueroa5, Cedric Chou6, Allan K. Bertram6, Erika T. Quintana7, Luis A. Maldonado8, Agustín García-Reynoso1, Meng Si6, and Victoria E. Irish6 Luis A. Ladino et al.
  • 1Centro de Ciencias de la Atmosfera, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
  • 2Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
  • 3School of Chemical Sciences and Engineering, Universidad Yachay Tech, Ecuador
  • 4Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
  • 5Laboratorio de Ingenieria y Procesos Costeros, Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, Sisal, Yucatan, Mexico
  • 6Chemistry Department, University of British Columbia, Vancouver, Canada
  • 7Escuela Nacional de Ciencias Biologicas, Instituto Politecnico Nacional, Mexico City, Mexico
  • 8Facultad de Quimica, Universidad Nacional Autonoma de Mexico, Mexico City, Mexico

Abstract. Atmospheric aerosol particles that can nucleate ice are referred to as ice nucleating particles (INP). Recent studies have confirmed that aerosol particles emitted by mid- and high-latitude oceans can act as INPs. This very relevant information can be included in climate and weather models to predict the formation of ice in clouds, given that most of them do not consider the oceans as a source of INPs. Very few studies to sample INPs have been carried out in tropical latitudes, and there is a need to evaluate their availability to understand the potential role that marine aerosol may play in the hydrological cycle of tropical regions.

This study presents results from the first measurements obtained during a field campaign conducted in the topical village of Sisal, located on the coast of the Gulf of Mexico of the Yucatan peninsula in Mexico in January–February 2017, and one of the few data sets currently available at similar latitudes. Aerosol particles sampled in Sisal are shown to be very efficient INPs, with onset freezing temperatures as high as −3°C (in some cases), similar to the onset temperature for Pseudomonas syringae. The results show that the INP concentration in Sisal is higher than at other locations sampled with the same type of INP counter. Air masses arriving in Sisal during the passage of cold fronts have, surprisingly, higher INP concentrations than the campaign-average, despite their lower total aerosol concentration.

Biological particles were likely found to be very important in ice cloud formation at this tropical location, given the large concentration of INPs above −12°C. A variety of bacteria and fungi were identified. Although the majority are of terrestrial origin, some of them are clearly oceanic.

Luis A. Ladino et al.
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Luis A. Ladino et al.
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This study presents results obtained during a field campaign conducted in the tropical village of Sisal located on the coast of the Gulf of Mexico. Air masses arriving in Sisal during the passage of cold fronts have, surprisingly, higher ice nucleating particle (INP) concentrations than the campaign-average. Biological particles were likely found to be very important in ice cloud formation at this tropical location, given the large concentration of INPs above −12 °C.
This study presents results obtained during a field campaign conducted in the tropical village...
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