Preprints
https://doi.org/10.5194/egusphere-2023-1456
https://doi.org/10.5194/egusphere-2023-1456
10 Oct 2023
 | 10 Oct 2023
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Measurement Report: A comparison of ice-nucleating particle and cloud condensation nuclei sources and properties during autumn at contrasting marine and terrestrial locations

Elise K. Wilbourn, Larissa Lacher, Carlos Guerrero, Hemanth S. K. Vepuri, Kristina Höhler, Jens Nadolny, Ottmar Möhler, and Naruki Hiranuma

Abstract. Ice-nucleating particles (INPs) are an important class of aerosols found worldwide that have far-reaching but poorly quantified climate feedback mechanisms through interaction with clouds and impacts on precipitation. These particles can have highly variable physicochemical properties in the atmosphere, and it is vital to measure their concentration and interconnection with other ambient aerosol populations at a wide variety of sites to comprehensively understand aerosol-cloud interactions in the atmosphere. Toward this aim, we have measured INP concentrations at two contrasting sites, one in the Southern Great Plains (SGP) region of the United States with a substantial terrestrially influenced aerosol population, and one in the Eastern North Atlantic Ocean (ENA) with a primarily marine-influenced aerosol population. These measurements were made at a high time resolution for at least 45 days at each site. From our ENA data, a singular relationship between cloud condensation nuclei (CCN) and INPs was found, suggesting that INPs and CCN originated from the same population of aerosols and potentially the same source. Backward air mass trajectories reveal a strong marine influence at ENA with most air masses originating over the Atlantic Ocean, but analysis of particle chemistry suggested an additional mineral dust INP source at ENA that did not contain large quantities of organic material. This relationship between CCN and INPs was not seen at SGP, and in fact has never been detected before, suggesting that the aerosol particles collected at ENA may represent a unique class of marine aerosols that contain both mineral dust and organics internally mixed in the aerosols and that are capable of acting as both CCN and INPs.

Elise K. Wilbourn et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Elise K. Wilbourn et al.

Data sets

Abundance of ice-nucleating particles and cloud condensation nuclei measured at the Southern Great Plains and Eastern North Atlantic observatories in autumn 2019 and 2020 Naruki Hiranuma https://www.doi.org/10.6084/m9.figshare.24199176

Elise K. Wilbourn et al.

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Short summary
Ambient ice and cloud particles were measured at terrestrial and temperate marine sites. Ice particles were more abundant in the former site while the fraction of ice particles relative to total ambient particles was higher in the latter site. We found continental and biogenic materials as a major source of ice particles in the terrestrial site. A positive correlation was found for ice and cloud particle concentrations in the marine site, implying they originate from the same source.