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Ice Nucleating Particle Connections to Regional Argentinian Land Surface Emissions and Weather During the Cloud, Aerosol, and Complex Terrain Interactions Experiment

Testa, B.; Hill, T. C. J.; Marsden, N. A.; Barry, K. R.; Hume, C. C.; Bian, Q.; Uetake, J.; Hare, H.; Perkins, R. J.; Möhler, O.; Kreidenweis, S. M.; DeMott, P. J.


Here, we present a multi-season study of ice-nucleating particles (INPs) active via the immersion freezing mechanism, which took place in north-central Argentina, a worldwide hotspot for mesoscale convective storms. INPs were measured untreated, after heating to 95°C, and after hydrogen peroxide digestion. No seasonal cycle of INP concentrations was observed. Heat labile INPs, which we define as “biological” herein, dominated the population active at −5 to −20°C, while non-heat-labile organic INPs (decomposed by peroxide) dominated at lower temperatures, from −20 to −28°C. Inorganic INPs (remaining after peroxide digestion), were minor contributors to the overall INP activity. Biological INP concentration active around −12°C peaked during rain events and under high relative humidity, reflecting emission mechanisms independent of the background aerosol concentration. The ratio of non-heat-labile organic and inorganic INPs was generally constant, suggesting they originated from the same source, presumably from regional arable topsoil based on air mass histories. Single particle mass spectrometry showed that soil particles aerosolized from a regionally common agricultural topsoil contained known mineral INP sources (K-feldspar and illite) as well as a significant organic component. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000141467
Veröffentlicht am 01.07.2022
DOI: 10.1029/2021JD035186
Zitationen: 11
Web of Science
Zitationen: 11
Zitationen: 15
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Aerosolforschung (IMK-AAF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2169-897X, 0148-0227, 2156-2202, 2169-8996
KITopen-ID: 1000141467
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Erschienen in Journal of Geophysical Research: Atmospheres
Verlag John Wiley and Sons
Band 126
Heft 23
Seiten e2021JD035186
Nachgewiesen in Scopus
Web of Science
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