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Convection under internal waves in an alpine lake
van Haren, H.; Dijkstra, H.A. (2021). Convection under internal waves in an alpine lake. Environ. Fluid Mech. 21: 305-316. https://doi.org/10.1007/s10652-020-09774-2
In: Environmental Fluid Mechanics. Springer: London; Dordrecht; Boston. ISSN 1567-7419; e-ISSN 1573-1510, meer
Peer reviewed article  

Beschikbaar in  Auteurs 
  • NIOZ: NIOZ Open Repository - postprints 360864 [ beschikbaar vanaf 01/10/2021 ]
  • NIOZ: NIOZ files 360863

Author keywords
    Deep-sea turbulence; Convection; Internal waves; High-resolution moored temperature observations; Lake Garda

Auteurs  Top 
  • van Haren, H., meer
  • Dijkstra, H.A.

Abstract
    Turbulent mixing processes in deep alpine Lake Garda (I) have not extensively been observed. Knowledge about drivers of turbulent fluxes are important for insights in the transport of matter, nutrients and pollutants, in the lake and in natural water bodies in general. In this paper, the occurrence of internal wave induced turbulent convection, termed 'internally forced convection', is addressed as opposed to the more common shear-induced turbulence in a density stratified environment. Observations are analyzed from a dedicated yearlong mooring holding 100 high-resolution temperature sensors at 1.5 m intervals under a single current meter in the deeper half of the 344 m deep lake-center. Episodically, the weakly density stratified waters in the lower 50 m above the lake-floor show spectral slope and coherence evidence of short-term (15–30 min) convective motions under internal waves that are supported by the stronger stratified waters above. The near-homogeneous conditions are not attributable to frictional Ekman dynamics, but to large-scale internal wave crests.

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