Articles | Volume 25, issue 1
https://doi.org/10.5194/acp-25-511-2025
https://doi.org/10.5194/acp-25-511-2025
Research article
 | 
16 Jan 2025
Research article |  | 16 Jan 2025

Valley floor inclination affecting valley winds and transport of passive tracers in idealised simulations

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

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Cited articles

Bianchi, F., Junninen, H., Bigi, A., Sinclair, V., Dada, L., Hoyle, C., Zha, Q., Yao, L., Ahonen, L., Bonasoni, P., Buenrostro Mazon, S., Hutterli, M., Laj, P., Lehtipalo, K., Kangasluoma, J., Kerminen, V., Kontkanen, J., Marinoni, A., Mirme, S., Molteni, U., Petaja, T., Riva, M., Rose, C., Sellegri, K., Yan, C., Worsnop, D., Kulmala, M., Baltensperger, U., and Dommen, J.: Biogenic particles formed in the Himalaya as an important source of free tropospheric aerosols, Nat. Geosci., 14, 4–9, https://doi.org/10.1038/s41561-020-00661-5, 2021. a, b, c, d
Bollasina, M., Bertolani, L., and Tartari, G.: Meteorological observations at high altitude in the Khumbu Valley, Nepal Himalayas, 1994–1999, Bull. Glaciol. Res., 19, 1–11, 2002. a
Bonasoni, P., Laj, P., Marinoni, A., Sprenger, M., Angelini, F., Arduini, J., Bonafè, U., Calzolari, F., Colombo, T., Decesari, S., Di Biagio, C., di Sarra, A. G., Evangelisti, F., Duchi, R., Facchini, MC., Fuzzi, S., Gobbi, G. P., Maione, M., Panday, A., Roccato, F., Sellegri, K., Venzac, H., Verza, GP., Villani, P., Vuillermoz, E., and Cristofanelli, P.: Atmospheric Brown Clouds in the Himalayas: first two years of continuous observations at the Nepal Climate Observatory-Pyramid (5079 m), Atmos. Chem. Phys., 10, 7515–7531, https://doi.org/10.5194/acp-10-7515-2010, 2010. a, b
Farina, S. and Zardi, D.: Understanding Thermally Driven Slope Winds: Recent Advances and Open Questions, Bound.-Lay. Meteorol., 189, 5–52, https://doi.org/10.1007/s10546-023-00821-1, 2023. a, b, c
Göbel, M.: WRFlux v.1.4.1, Github repository, https://github.com/matzegoebel/WRFlux/releases/tag/v1.4.1 (last access: 20 June 2024), 2022. a, b
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This study investigates the influence of valley floor inclination on diurnal winds and passive tracer transport within idealised mountain valleys using numerical simulations. The valley inclination strengthens the daytime up-valley winds but only up to a certain point. Beyond that critical angle, the winds weaken again. The inclined valleys transport the tracers higher up in the free troposphere, which would, for example, lead to higher potential for long-range transport.
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