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Intermittent Intense Turbulent Mixing under Ice in the Laptev Sea Continental Shelf

Lenn, Yueng-Djern, Rippeth, Tom P., Old, Chris P., Bacon, Sheldon, Polyakov, Igor, Ivanov, Vladimir and Hölemann, Jens (2011) Intermittent Intense Turbulent Mixing under Ice in the Laptev Sea Continental Shelf Journal of Physical Oceanography, 41, (3), pp. 531-547. (doi:10.1175/2010JPO4425.1).

Record type: Article


Vertical mixing in the bottom boundary layer and pycnocline of the Laptev Sea is evaluated from a rapidly sampled 12-h time series of microstructure temperature, conductivity, and shear observations collected under 100% sea ice during October 2008. The bottom boundary turbulent kinetic energy dissipation was observed to be enhanced (? 10?4 W m?3) beyond background levels (? 10?6 W m?3), extending up to 10 m above the seabed when simulated tidal currents were directed on slope. Upward heat fluxes into the halocline-class waters along the Laptev Sea seabed peaked at 4–8 W m?2, averaging out to 2 W m?2 over the 12-h sampling period. In the Laptev Sea pycnocline, an isolated 2-h episode of intense dissipation (? 10?3 W m?3) and vertical diffusivities was observed that was not due to a localized wind event. Observations from an acoustic Doppler current meter moored in the central Laptev Sea near the M2 critical latitude are consistent with a previous model in which mixing episodes are driven by an enhancement of the pycnocline shear resulting from the alignment of the rotating pycnocline shear vector with the under-ice stress vector. Upward cross-pycnocline heat fluxes from the Arctic halocline peaked at 54 W m?2, resulting in a 12-h average of 12 W m?2. These results highlight the intermittent nature of Arctic shelf sea mixing processes and how these processes can impact the transformation of Arctic Ocean water masses. The observations also clearly demonstrate that absence or presence of sea ice profoundly affects the availability of near-inertial kinetic energy to drive vertical mixing on the Arctic shelves.

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Published date: March 2011
Keywords: Mixing, Sea ice, Continental shelf/slope
Organisations: Marine Physics and Ocean Climate


Local EPrints ID: 183783
ISSN: 0022-3670
PURE UUID: fbded76e-9e40-4488-9aec-c7da849ded54

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Date deposited: 03 May 2011 13:42
Last modified: 18 Jul 2017 11:55

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Author: Yueng-Djern Lenn
Author: Tom P. Rippeth
Author: Chris P. Old
Author: Sheldon Bacon
Author: Igor Polyakov
Author: Vladimir Ivanov
Author: Jens Hölemann

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