The University of Southampton
University of Southampton Institutional Repository

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

Abstract

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.

Full text not available from this repository.

More information

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

Identifiers

Local EPrints ID: 183783
URI: http://eprints.soton.ac.uk/id/eprint/183783
ISSN: 0022-3670
PURE UUID: fbded76e-9e40-4488-9aec-c7da849ded54

Catalogue record

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

Export record

Altmetrics

Contributors

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

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×