Articles | Volume 20, issue 4
https://doi.org/10.5194/acp-20-2341-2020
https://doi.org/10.5194/acp-20-2341-2020
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27 Feb 2020
Research article | Highlight paper |  | 27 Feb 2020

Ultra-clean and smoky marine boundary layers frequently occur in the same season over the southeast Atlantic

Sam Pennypacker, Michael Diamond, and Robert Wood

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Short summary
Using observations from instruments deployed to a small island in the southeast Atlantic, we study days when the atmospheric concentrations of particles near the surface are exceptionally low. Interestingly, these ultra-clean boundary layers occur in the same months as the smokiest boundary layers associated with biomass burning in Africa. We find evidence that enhancements in drizzle scavenging, on top of a seasonal maximum in cloudiness and precipitation, likely drive these conditions.
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