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Comparison of in situ microstructure measurements to different turbulence closure schemes in a 3-D numerical ocean circulation model

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Title
Comparison of in situ microstructure measurements to different turbulence closure schemes in a 3-D numerical ocean circulation model
Author(s)
Andrea Costa; Doglioli, A.M.; Marsaleix, P.; Petrenko, A.A.
Publication Date
2017-12
Journal
Ocean Modelling, v.120, pp.1 - 17
Publisher
Elsevier Ltd
Abstract
In situ measurements of kinetic energy dissipation rate ε and estimates of eddy viscosity KZ from the Gulf of Lion (NW Mediterranean Sea) are used to assess the ability of k−ɛ and k−ℓ closure schemes to predict microscale turbulence in a 3-D numerical ocean circulation model. Two different surface boundary conditions are considered in order to investigate their influence on each closure schemes’ performance. The effect of two types of stability functions and optical schemes on the k−ɛ scheme is also explored. Overall, the 3-D model predictions are much closer to the in situ data in the surface mixed layer as opposed to below it. Above the mixed layer depth, we identify one model's configuration that outperforms all the other ones. Such a configuration employs a k−ɛ scheme with Canuto A stability functions, surface boundary conditions parameterizing wave breaking and an appropriate photosynthetically available radiation attenuation length. Below the mixed layer depth, reliability is limited by the model's resolution and the specification of a hard threshold on the minimum turbulent kinetic energy. © 2017 Elsevier Ltd
URI
https://pr.ibs.re.kr/handle/8788114/12979
DOI
10.1016/j.ocemod.2017.10.002
ISSN
1463-5003
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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