Characteristics of Ice Nucleating Particles From the Long‐Range Transport of Saharan Dust

Abstract Transported mineral dust in a Saharan air layer (SAL) contains active ice‐nucleating particles (INPs) that may be transported across the Atlantic Ocean and subsequently seed clouds in the Caribbean and the Americas. During an aircraft campaign around Houston and the western U.S. Gulf Coast, a widespread SAL advected into the sampling region allowing for measurement of the ice‐nucleating ability of SD following long‐range transport. Results showed that the mean INP concentrations were 3–4.5 times higher than non‐Saharan dust (nSD), but only at temperatures <−21°C. Active surface site densities were also enhanced in the SD, exceeding the mean for nSD by over an order of magnitude at temperatures <−21°C. These INP measurements confirmed that SD remains an active INP even after >8,000 km westward transport across the Atlantic Ocean.

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Publication Details

Journal
Geophysical Research Letters
Published
2025-06-08
DOI
https://doi.org/10.1029/2024gl113365
Citations
1
Primary Topic
Atmospheric chemistry and aerosols
Type
article
Field-Weighted Citation Impact
1.30

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article en
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Abstract

Abstract Transported mineral dust in a Saharan air layer (SAL) contains active ice‐nucleating particles (INPs) that may be transported across the Atlantic Ocean and subsequently seed clouds in the Caribbean and the Americas. During an aircraft campaign around Houston and the western U.S. Gulf Coast, a widespread SAL advected into the sampling region allowing for measurement of the ice‐nucleating ability of SD following long‐range transport. Results showed that the mean INP concentrations were 3–4.5 times higher than non‐Saharan dust (nSD), but only at temperatures <−21°C. Active surface site densities were also enhanced in the SD, exceeding the mean for nSD by over an order of magnitude at temperatures <−21°C. These INP measurements confirmed that SD remains an active INP even after >8,000 km westward transport across the Atlantic Ocean.

Geophysical Research LettersVol. 52(11)
NSF National Center for Atmospheric Research (US), Scripps Institution of Oceanography (US), Cooperative Institute for Mesoscale Meteorological Studies (US), University of California San Diego (US), NSF NCAR Climate and Global Dynamics Laboratory (US), National Research Council Canada (CA), Stony Brook University (US), University of Oklahoma (US), Colorado State University (US)
National Science Foundation, U.S. Department of Energy, National Research Council Canada
Openalex Percentile: Top 22%
Atmospheric chemistry and aerosols
1.30
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