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Multi-year wind dynamics around Lake Tanganyika

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Docquier, David [UCL] Thiery, W. Lhermitte, S. van Lipzig, N.

Lake Tanganyika is the second largest freshwater lake in the world by volume and is of prime importance for the regional economy in East Africa. Although the lake is recognized as a key component of the regional climate system, little is known about atmospheric dynamics in its surroundings. To understand this role, we analyze winds around Lake Tanganyika as modeled by a high resolution(7 km) regional climate model (Consortium for Small-scaleModeling in Climate Mode) over the period 1999–2008.Modeled surface wind speed and direction are in very good agreement with high resolution (12.5 km) Quick Scatterometer(QuikSCAT) satellite wind observations duringthe dry season. Comparison of a control run with a modelsimulation where all lake pixels are replaced by representative land pixels indicates that mean surface wind speed over Lake Tanganyika almost doubles due to lake presence. Furthermore, a region of higher surface wind speed in the central part of the lake is identified and confirmed by QuikSCAT observations. A combination of wind channeling along valley mountains and wind confluence on the upwind side of the lake is responsible for this speed-up.The lower wind speeds in the rest of the lake result from blocked conditions due to more pronounced orography. Finally, the model captures a zone of higher wind speed at around 2 km height, associated with the low-level Somali jet. These results demonstrate that high resolution climate modeling allows a detailed understanding of wind dynamics in the vicinity of Lake Tanganyika.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2016
Language Anglais
Journal information "Climate Dynamics" - (2016)
Peer reviewed yes
Publisher Springer-Verlag Germany (Heidelberg)
issn 0930-7575
e-issn 1432-0894
Publication status Publié
Affiliation UCL - SST/ELI/ELIC - Earth & Climate
Keywords CISM:CECI ; Lake Tanganyika ; Wind ; Orography ; Regional climate model ; 1443
Links
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Bibliographic reference Docquier, David ; Thiery, W. ; Lhermitte, S. ; van Lipzig, N.. Multi-year wind dynamics around Lake Tanganyika. In: Climate Dynamics, (2016)
Permanent URL http://hdl.handle.net/2078.1/172320