Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 15
Articles | Volume 26, issue 15
https://doi.org/10.5194/acp-26-11171-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-11171-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 15
Research article
 | 
11 Aug 2026
Research article |  | 11 Aug 2026

Impact of black carbon on daytime valley and slope winds in idealised simulations

Johannes Mikkola, Victoria A. Sinclair, Giancarlo Ciarelli, Alexander Gohm, and Federico Bianchi

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Short summary
This study investigates the effect of black carbon on the diurnal winds within idealised mountain valleys using numerical simulations. Absorption of solar radiation by black carbon weakens the up-slope winds, but unexpectedly strengthens the afternoon up-valley winds. This happens because weaker up-slope winds remove less momentum from the valley, allowing the up-valley winds to become stronger even though the overall driving force is reduced by the absorption.
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