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Ocean Science An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/osd-10-2141-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/osd-10-2141-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

  19 Nov 2013

19 Nov 2013

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This preprint was under review for the journal OS. A revision for further review has not been submitted.

Turbulent mixing in the seasonally-stratified western Irish Sea: a Thorpe Scale perspective

K. L. Stansfield1, M. R. Palmer2, T. P. Rippeth3, and J. H. Simpson3 K. L. Stansfield et al.
  • 1School of Ocean and Earth Science, National Oceanography Centre, European Way, Southampton, SO14 3ZH, UK
  • 2National Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool, L3 5DA, UK
  • 3School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB, UK

Abstract. The seasonal thermocline in shelf-seas represents an important biogeophysical barrier to the vertical flux of nutrients into the photic zone. Episodic weakening of this barrier plays an important role in sustaining the sub-surface chlorophyll maximum in summer and hence impacts the carbon draw-down in the seasonally-stratified zones of the shelf seas. Here we present estimates of the rate of turbulent kinetic energy dissipation inferred from microstructure shear probes and compare them with dissipation rates inferred from a standard conductivity-temperature-depth instrument and from a fast thermistor (Thorpe Scale methodology) at a site in the seasonally-stratified Irish Sea. All methods show strong dissipation rates in response to tidal stresses near the bed (order 10−2 Wm−3) with qualitatively similar temporal and spatial patterns. In the interior of the water column, however, only the microstructure shear probe estimates resolve the mixing in the region of the thermocline.

K. L. Stansfield et al.

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K. L. Stansfield et al.

K. L. Stansfield et al.

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