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

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

doi:10.5194/acp-26-11171-2026

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

Supplement

https://doi.org/10.5194/acp-26-11171-2026-supplement

Data sets

Data for "Impact of black carbon on daytime valley and slope winds in idealised simulations'' Johannes Mikkola https://doi.org/10.23729/fd-6a9a208f-e7b5-3e99-ba8d-cd7964e4099b

Model code and software

Model and analysis code for "Impact of black carbon on daytime valley and slope winds in idealised simulations'' Johannes Mikkola https://doi.org/10.5281/zenodo.17852772

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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.