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

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.

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Supplementary material to "African Dust Particles over the Western Caribbean Part I: Impact on air quality over the Yucatan Peninsula"

10.5194/acp-2020-378-supplement ◽

2020 ◽

Author(s):

Carolina Ramirez-Romero ◽

Alejandro Jaramillo ◽

Maria F. Cordoba ◽

Graciela B. Raga ◽

Javier Miranda ◽

...

Keyword(s):

Air Quality ◽

Yucatan Peninsula ◽

Dust Particles ◽

African Dust ◽

Yucatán Peninsula ◽

Western Caribbean ◽

Supplementary Material

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Supplementary material to "Concerted measurements of free amino acids at the Cape Verde Islands: High enrichments in submicron sea spray aerosol particles and cloud droplets"

10.5194/acp-2019-976-supplement ◽

2020 ◽

Author(s):

Nadja Triesch ◽

Manuela van Pinxteren ◽

Anja Engel ◽

Hartmut Herrmann

Keyword(s):

Amino Acids ◽

Free Amino Acids ◽

Free Amino ◽

Aerosol Particles ◽

Cape Verde ◽

Sea Spray ◽

Cloud Droplets ◽

Cape Verde Islands ◽

Sea Spray Aerosol ◽

Supplementary Material

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ADABBOY: African Dust And Biomass Burning Over Yucatan

Bulletin of the American Meteorological Society ◽

10.1175/bams-d-20-0172.1 ◽

2021 ◽

pp. 1-39

Author(s):

Graciela B. Raga ◽

Luis A. Ladino ◽

Darrel Baumgardner ◽

Carolina Ramirez-Romero ◽

Fernanda Córdoba ◽

...

Keyword(s):

Air Quality ◽

Biomass Burning ◽

Yucatan Peninsula ◽

Biological Properties ◽

Trade Winds ◽

Particulate Pollution ◽

African Dust ◽

Yucatán Peninsula ◽

Urban Sites ◽

Different Sources

AbstractBiomass burning (BB) emissions and African dust (AD) are often associated with poor regional air quality, particularly in the tropics. The Yucatan Peninsula is a fairly pristine site due to predominant trade winds, but occasionally BB and AD plumes severely degrade its air quality. The African Dust And Biomass Burning Over Yucatan (ADABBOY) project (Jan 2017- Aug 2018) was conducted in the Yucatan Peninsula to characterize physical and biological properties of particulate pollution at remote seaside and urban sites. The 18-month long project quantified the large interannual variability in frequency and spatial extent of BB and AD plumes. Remote and urban sites experienced air quality degradation under the influence of these plumes, with up to 200 and 300% increases in coarse particle mass under BB and AD influence, respectively. ADABBOY is the first project to systematically characterize elemental composition of airborne particles as a function of these sources and identify bioaerosol over Yucatan. Bacteria, actinobacteria (both continental and marine) and fungi propagules vary seasonally and interannually and revealed the presence of very different species and genera associated with different sources. A novel contribution of ADABBOY was the determination of the ice-nucleating abilities of particles emitted by different sources within an under-sampled region of the world. BB particles were found to be inefficient ice nucleating particles at temperatures warmer than -20°C, whereas both AD and background marine aerosol activated ice nucleating particles below -10°C.

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

Atmospheric Chemistry and Physics ◽

10.5194/acp-21-4453-2021 ◽

2021 ◽

Vol 21 (6) ◽

pp. 4453-4470

Author(s):

Fernanda Córdoba ◽

Carolina Ramírez-Romero ◽

Diego Cabrera ◽

Graciela B. Raga ◽

Javier Miranda ◽

...

Keyword(s):

Biomass Burning ◽

Aerosol Particles ◽

Air Masses ◽

African Dust ◽

Sea Spray Aerosol ◽

Surface Active ◽

Field Campaigns ◽

Aerosol Types ◽

Aerosol Type ◽

Term Field

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 (INPs). Although there are a large number of INP sources, the ice nucleating abilities of aerosol particles originating from oceans, deserts, and wildfires are poorly described at tropical latitudes. To fill this gap in knowledge, the National Autonomous University of Mexico micro-orifice uniform deposit impactor droplet freezing technique (UNAM-MOUDI-DFT) was constructed to measure the ice nucleating activity of aerosol samples that were collected in Sisal and Mérida, Yucatán (Mexico) under the influence of cold fronts, biomass burning (BB), and African dust (AD) intrusions during five short-term field campaigns between January 2017 and July 2018. The three different aerosol types were distinguished by their physicochemical properties. Marine aerosol (MA), BB, and AD air masses were found to contain INPs; the highest concentrations were in AD (from 0.071 to 36.07 L−1 at temperatures between −18 and −27 ∘C), followed by MA (from 0.068 to 18.90 L−1 at temperatures between −15 and −28 ∘C) and BB (from 0.063 to 10.21 L−1 at temperatures between −20 and −27 ∘C). However, MA had the highest surface active site densities (ns) between −15 and −30 ∘C. Additionally, supermicron particles contributed more than 72 % of the total INP concentration independent of aerosol type.

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