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| Titel |
Understanding the performance of the FLake model over two African Great Lakes |
| VerfasserIn |
W. Thiery, A. Martynov, F. Darchambeau, J.-P. Descy, P.-D. Plisnier, L. Sushama, N. P. M. van Lipzig |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 1 ; Nr. 7, no. 1 (2014-02-18), S.317-337 |
| Datensatznummer |
250115545
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| Publikation (Nr.) |
 copernicus.org/gmd-7-317-2014.pdf |
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| Zusammenfassung |
| The ability of the one-dimensional lake model FLake to represent the
mixolimnion temperatures for tropical conditions was tested for three
locations in East Africa: Lake Kivu and Lake Tanganyika's northern and
southern basins. Meteorological observations from surrounding automatic
weather stations were corrected and used to drive FLake, whereas a
comprehensive set of water temperature profiles served to evaluate the model
at each site. Careful forcing data correction and model configuration made it
possible to reproduce the observed mixed layer seasonality at Lake Kivu and
Lake Tanganyika (northern and southern basins), with correct representation
of both the mixed layer depth and water temperatures. At Lake Kivu,
mixolimnion temperatures predicted by FLake were found to be sensitive both
to minimal variations in the external parameters and to small changes in the
meteorological driving data, in particular wind velocity. In each case, small
modifications may lead to a regime switch, from the correctly represented
seasonal mixed layer deepening to either completely mixed or permanently
stratified conditions from ~ 10 m downwards. In contrast, model
temperatures were found to be robust close to the surface, with acceptable
predictions of near-surface water temperatures even when the seasonal mixing
regime is not reproduced. FLake can thus be a suitable tool to parameterise
tropical lake water surface temperatures within atmospheric prediction
models. Finally, FLake was used to attribute the seasonal mixing cycle at
Lake Kivu to variations in the near-surface meteorological conditions. It was
found that the annual mixing down to 60 m during the main dry season is
primarily due to enhanced lake evaporation and secondarily to the
decreased incoming long wave radiation, both causing a significant heat loss
from the lake surface and associated mixolimnion cooling. |
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