Articles | Volume 21, issue 1
https://doi.org/10.5194/acp-21-239-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-21-239-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
12 Jan 2021
Research article |
| 12 Jan 2021
| 12 Jan 2021
African dust particles over the western Caribbean – Part I: Impact on air quality over the Yucatán Peninsula
Carolina Ramírez-Romero
Centro de Ciencias de la Atmósfera, Universidad Nacional
Autónoma de México, Mexico City, Mexico
Alejandro Jaramillo
Centro de Ciencias de la Atmósfera, Universidad Nacional
Autónoma de México, Mexico City, Mexico
María F. Córdoba
Centro de Ciencias de la Atmósfera, Universidad Nacional
Autónoma de México, Mexico City, Mexico
Posgrado en Ciencias Químicas, Universidad Nacional Autónoma
de México, Mexico City, Mexico
Graciela B. Raga
Centro de Ciencias de la Atmósfera, Universidad Nacional
Autónoma de México, Mexico City, Mexico
Javier Miranda
Instituto de Física, Universidad Nacional Autónoma de México,
Mexico City, Mexico
Harry Alvarez-Ospina
Facultad de Ciencias, Universidad Nacional Autónoma de México,
Mexico City, Mexico
Daniel Rosas
Facultad de Química, Universidad Autónoma de Yucatán, Mérida, Yucatán, Mexico
Talib Amador
Facultad de Química, Universidad Autónoma de Yucatán, Mérida, Yucatán, Mexico
Jong Sung Kim
Department of Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
Jacqueline Yakobi-Hancock
Department of Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
Darrel Baumgardner
Droplet Measurement Technologies, Colorado, USA
Luis A. Ladino
CORRESPONDING AUTHOR
Centro de Ciencias de la Atmósfera, Universidad Nacional
Autónoma de México, Mexico City, Mexico
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Almuth Neuberger, Rahul Ranjan, Hao Ding, Fredrik Mattsson, Lea Haberstock, Darrel Baumgardner, Stefano Decesari, Annica M. L. Ekman, Dagen D. Hughes, Claudia Mohr, Marco Paglione, Ilona Riipinen, Matteo Rinaldi, and Paul Zieger
Atmos. Chem. Phys., 26, 11991–12017, https://doi.org/10.5194/acp-26-11991-2026, https://doi.org/10.5194/acp-26-11991-2026, 2026
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Sebastián Mendoza-Téllez, Karla Valdés, David Ramírez, Jan Alexis Cedillo, Olivia Rivera-Hernández, Fernanda Córdoba, Harry Alvarez, Javier Miranda, Irma Rosas, Graciela B. Raga, Emma Negrete, Leticia Martínez, Eva Salinas, and Luis A. Ladino
Atmos. Chem. Phys., 26, 8295–8310, https://doi.org/10.5194/acp-26-8295-2026, https://doi.org/10.5194/acp-26-8295-2026, 2026
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Magacities (i.e., urban centers with > 10 million inhabitants) are a great source of urban aerosol particles. In this study we evaluated the differences in the physicochemical and biological properties of the urban particles from southern and northern Mexico City, one of the largest Megacities worldwide. We also, correlated the observed differences with their capability to impact cloud formation, with the aim to link these observations with the presence of microclimates.
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The exchange of material between the ocean and atmosphere plays an important role in regulating Earth’s climate. Through wave action, the ocean releases tiny airborne particles that influence atmospheric processes. This study examines how biological and chemical processes in seawater affect the properties of particles emitted from the ocean, highlighting the complex links between ocean biology and marine aerosols.
M. Fernanda Córdoba, Rachel Chang, Harry Alvarez-Ospina, Aramis Olivos-Ortiz, Graciela B. Raga, Daniel Rosas-Ramírez, Guadalupe Campos, Isabel Márquez, Telma Castro, and Luis A. Ladino
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The present study shows the development of the UNAM-MARine Aerosol Tank (UNAM-MARAT), a device that simulates wave breaking to generate marine aerosol particles. The portable and automatic tank is able to generate particle concentrations as high as 2000 cm-3, covering a wide range of sizes, similar to those found in the ambient marine boundary layer. The sea spray aerosol generated from three natural seawater samples was found to act as ice-nucleating particles (INPs) via immersion freezing.
Bighnaraj Sarangi, Darrel Baumgardner, Ana Isabel Calvo, Benjamin Bolaños-Rosero, Roberto Fraile, Alberto Rodríguez-Fernández, Delia Fernández-González, Carlos Blanco-Alegre, Cátia Gonçalves, Estela D. Vicente, and Olga L. Mayol-Bracero
Atmos. Chem. Phys., 25, 843–865, https://doi.org/10.5194/acp-25-843-2025, https://doi.org/10.5194/acp-25-843-2025, 2025
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Measurements of fluorescing aerosol particle properties have been made during two major African dust events, one over the island of Puerto Rico and the other over the city of León, Spain. The measurements were made with two wideband integrated bioaerosol spectrometers. A significant change in the background aerosol properties, at both locations, is observed when the dust is in the respective regions.
Mahen Konwar, Benjamin Werden, Edward C. Fortner, Sudarsan Bera, Mercy Varghese, Subharthi Chowdhuri, Kurt Hibert, Philip Croteau, John Jayne, Manjula Canagaratna, Neelam Malap, Sandeep Jayakumar, Shivsai A. Dixit, Palani Murugavel, Duncan Axisa, Darrel Baumgardner, Peter F. DeCarlo, Doug R. Worsnop, and Thara Prabhakaran
Atmos. Meas. Tech., 17, 2387–2400, https://doi.org/10.5194/amt-17-2387-2024, https://doi.org/10.5194/amt-17-2387-2024, 2024
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In a warm cloud seeding experiment hygroscopic particles are released to alter cloud processes to induce early raindrops. During the Cloud–Aerosol Interaction and Precipitation Enhancement Experiment, airborne mini aerosol mass spectrometers analyse the particles on which clouds form. The seeded clouds showed higher concentrations of chlorine and potassium, the oxidizing agents of flares. Small cloud droplet concentrations increased, and seeding particles were detected in deep cloud depths.
Larissa Lacher, Michael P. Adams, Kevin Barry, Barbara Bertozzi, Heinz Bingemer, Cristian Boffo, Yannick Bras, Nicole Büttner, Dimitri Castarede, Daniel J. Cziczo, Paul J. DeMott, Romy Fösig, Megan Goodell, Kristina Höhler, Thomas C. J. Hill, Conrad Jentzsch, Luis A. Ladino, Ezra J. T. Levin, Stephan Mertes, Ottmar Möhler, Kathryn A. Moore, Benjamin J. Murray, Jens Nadolny, Tatjana Pfeuffer, David Picard, Carolina Ramírez-Romero, Mickael Ribeiro, Sarah Richter, Jann Schrod, Karine Sellegri, Frank Stratmann, Benjamin E. Swanson, Erik S. Thomson, Heike Wex, Martin J. Wolf, and Evelyn Freney
Atmos. Chem. Phys., 24, 2651–2678, https://doi.org/10.5194/acp-24-2651-2024, https://doi.org/10.5194/acp-24-2651-2024, 2024
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Aerosol particles that trigger ice formation in clouds are important for the climate system but are very rare in the atmosphere, challenging measurement techniques. Here we compare three cloud chambers and seven methods for collecting aerosol particles on filters for offline analysis at a mountaintop station. A general good agreement of the methods was found when sampling aerosol particles behind a whole air inlet, supporting their use for obtaining data that can be implemented in models.
Bighnaraj Sarangi, Darrel Baumgardner, Benjamin Bolaños-Rosero, and Olga L. Mayol-Bracero
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Here, the fluorescent characteristics and cloud-forming efficiency of aerosols at an urban site in Puerto Rico are discussed. The results from this pilot study highlight the capabilities of ultraviolet-induced fluorescence (UV-IF) measurements for characterizing the properties of fluorescing aerosol particles, as they relate to the daily evolution of primary biological aerosol particles. This work has established a database of measurements on which future, longer-term studies will be initiated.
Diana L. Pereira, Irma Gavilán, Consuelo Letechipía, Graciela B. Raga, Teresa Pi Puig, Violeta Mugica-Álvarez, Harry Alvarez-Ospina, Irma Rosas, Leticia Martinez, Eva Salinas, Erika T. Quintana, Daniel Rosas, and Luis A. Ladino
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Airborne particles were i) collected in an agricultural fields and ii) generated in the laboratory from agricultural soil samples to analyze their ice nucleating abilities. It was found that the size and chemical composition of the Mexican agricultural dust particles influence their ice nucleating behavior, where the organic components are likely responsible for their efficiency as INPs. The INP concentrations from the present study are comparable to those from higher latitudes.
Graciela B. Raga, Darrel Baumgardner, Blanca Rios, Yanet Díaz-Esteban, Alejandro Jaramillo, Martin Gallagher, Bastien Sauvage, Pawel Wolff, and Gary Lloyd
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The In-Service Aircraft for a Global Observing System (IAGOS) is a small fleet of commercial aircraft that carry a suite of meteorological, gas, aerosol, and cloud sensors and have been measuring worldwide for almost 9 years, since late 2011. Extreme ice events (EIEs) have been identified from the IAGOS cloud measurements and linked to surface emissions for biomass and fossil fuel consumption. The results reported here are highly relevant for climate change and flight operations forecasting.
Elvis Torres-Delgado, Darrel Baumgardner, and Olga L. Mayol-Bracero
Atmos. Chem. Phys., 21, 18011–18027, https://doi.org/10.5194/acp-21-18011-2021, https://doi.org/10.5194/acp-21-18011-2021, 2021
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African dust aerosols can travel thousands of kilometers and reach the Caribbean and other places, where they can serve as ice and cloud condensation nuclei and alter precipitation patterns. Cloud microphysical properties (droplet number and size) were measured in a Caribbean tropical montane cloud forest along with models and satellite products. The results of the study suggest that meteorology and air mass history are more important for cloud processes than aerosols transported from Africa.
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Short summary
Field measurements were conducted to confirm the arrival of African dust on the Yucatàn Peninsula. Aerosol particles were monitored at ground level by different online and off-line sensors. Several particulate matter peaks were observed with a relative increase in their levels of up to 500 % with respect to background conditions. Based on the chemical composition, back trajectories, vertical profiles, reanalysis, and satellite images, it was found that the peaks are linked to African dust.
Field measurements were conducted to confirm the arrival of African dust on the Yucatàn...
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