Boundary mixing in the thermocline of a large lake

Lorke, Andreas

Boundary mixing in the thermocline of a large lake

Dateien

Boundary_mixing_in_the_thermocline_of_a_large_lake.pdfGröße: 2.42 MBDownloads: 449

Datum

2007

Autor:innen

Lorke, Andreas

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Biologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Geophysical Research / Oceans. 2007, 112(C9), C09019. ISSN 0148-0227. Available under: doi: 10.1029/2006JC004008

Zusammenfassung

High-resolution measurements of near-bottom temperature stratification and current velocity were performed on the sloping boundary of a large lake at the depth of the seasonal thermocline. The measurements cover nearly the entire stratified period and reveal the periodic occurrence of strong temperature and current velocity fluctuations, which can be attributed to shoaling high-frequency internal waves with periods between 5 and 20 min. Two different techniques are applied to obtain a long-term record of dissipation rates of turbulent kinetic energy from the current velocity measurements. Shoaling of high-frequency internal waves is associated with a strong and rapid increase of turbulent dissipation rates of up to four orders of magnitude. Since the occurrence of high-frequency internal waves on the slope is correlated with the passage of the dominant basin-scale internal Kelvin wave with a period of four days, energy dissipation rates on the slope vary with the same period. Diapycnal diffusivities, estimated by combining the dissipation estimates with simultaneously measured density stratification, follow a similar dynamics and a comparison with a basin-scale diffusivity estimate based on tracer measurements reveal the importance of boundary mixing, which, at this particular site, is mainly driven by the interaction of high-frequency internal waves with the sloping boundary.

Fachgebiet (DDC)

570 Biowissenschaften, Biologie

Schlagwörter

turbulence, boundary mixing

Zitieren

ISO 690

LORKE, Andreas, 2007. Boundary mixing in the thermocline of a large lake. In: Journal of Geophysical Research / Oceans. 2007, 112(C9), C09019. ISSN 0148-0227. Available under: doi: 10.1029/2006JC004008

BibTex

@article{Lorke2007Bound-8567,
  year={2007},
  doi={10.1029/2006JC004008},
  title={Boundary mixing in the thermocline of a large lake},
  number={C9},
  volume={112},
  issn={0148-0227},
  journal={Journal of Geophysical Research / Oceans},
  author={Lorke, Andreas},
  note={Article Number: C09019}
}

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