Sources, frequency, and chemical nature of dust events impacting the United States East Coast

Atmospheric Environment
Abdulmonam M AldhaifArmin Sorooshian

Abstract

This study examines 14 years (2004-2017) of surface aerosol composition data from the EPA IMPROVE network with a focus on the monthly profile, sources, and chemical nature of extreme dust events (>92nd percentile of fine soil concentration each month) impacting ten sites along the United States East Coast ranging in latitude from Florida to Maine. Based on trajectory, remote sensing, and reanalysis data, dust events were categorized into four source categories: African, Asian, Mix (African + Asian), and Other (anything other than African and Asian). The results reveal that extreme dust events account for between 3.3% and 4.6% of total available days depending on the site. March-April-May (MAM) had the most (174) dust events, followed by June-July-August (JJA) with 172, and then by September-October-November (SON) with 160 and December-January-February (DFJ) with 150. There is a variability in the predominant dust sources based on latitude, with African and Other sources more influential from North Carolina to the south, while Asian and Other were most important from New Jersey to the north. The Mix category is consistently the least frequent dust category at all sites. The African dust category was linked to the highest fine so...Continue Reading

References

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Jul 24, 2020·Journal of Geophysical Research. Atmospheres : JGR·Armin SorooshianPaquita Zuidema

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Jun 24, 2021·Journal of Geophysical Research. Atmospheres : JGR·Abdulmonam M AldhaifArmin Sorooshian

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