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Fer, Ilker; Nicholls, Keith W; Darelius, Elin (2015): Measurements of ocean microstructure, physical oceanography and current in the Weddell Sea, Antarctica, during the RRS Ernest Shackleton cruises ES033 and ES060 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.854379, Supplement to: Fer, Ilker; Darelius, Elin; Daae, Kjersti (2016): Observations of energetic turbulence on the Weddell Sea continental slope. Geophysical Research Letters, 43(2), 760-766, https://doi.org/10.1002/2015GL067349

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Published: 2015-10-27 • DOI registered: 2015-11-25

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Abstract:
Turbulence profile measurements made on the upper continental slope and shelf of the southeastern Weddell Sea reveal striking contrasts in dissipation and mixing rates between the two sites. The mean profiles of dissipation rates from the upper slope are 1-2 orders of magnitude greater than the profiles collected over the shelf in the entire water column. The difference increases toward the bottom where the dissipation rate of turbulent kinetic energy and the vertical eddy diffusivity on the slope exceed 10-7 W kg-1 and 10-2 m2 s-1, respectively. Elevated levels of turbulence on the slope are concentrated within a 100 m thick bottom layer, which is absent on the shelf. The upper slope is characterized by near-critical slopes and is in close proximity to the critical latitude for semidiurnal internal tides. Our observations suggest that the upper continental slope of the southern Weddell Sea is a generation site of semidiurnal internal tide, which is trapped along the slope along the critical latitude, and dissipates its energy in a inline image m thick layer near the bottom and within inline image km across the slope.
Related to:
Darelius, Elin; Fer, Ilker (2013): Cruise Report - Cruise ES060 with R.R.S ERNEST SHACKLETON - 10 December 2012 - 28 January 2013. Geophysical Institute, University of Bergen, 27 pp, hdl:10013/epic.45259.d001
Nicholls, Keith W; Fer, Ilker; Griffiths, Colin; Huber, Bruce; Robinson, Patrick (2015): Report for Cruise ES033 - Second ACES-FOCAS cruise to the southern Weddell Sea - RRS Ernest Shackleton - 22 January to 7 March 2009. hdl:10013/epic.46127.d001
Coverage:
Median Latitude: -71.967965 * Median Longitude: -32.439412 * South-bound Latitude: -78.038000 * West-bound Longitude: -43.246000 * North-bound Latitude: -60.601000 * East-bound Longitude: -17.473000
Date/Time Start: 2009-01-26T14:14:00 * Date/Time End: 2013-01-11T01:45:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Nicholls, KW; Fer, I (2015): Physical oceanography from CTD in the Weddell Sea, Antarctica, during the RRS Ernest Shackleton cruise ES033. https://doi.org/10.1594/PANGAEA.854148
  2. Nicholls, KW; Fer, I (2015): Current measurements from LADCP in the Weddell Sea, Antarctica, during the RRS Ernest Shackleton cruise ES033. https://doi.org/10.1594/PANGAEA.854150
  3. Fer, I; Nicholls, KW (2015): Ocean microstructure measurements in the Weddell Sea continental slope, Antarctica, during the RRS Ernest Shackleton cruise ES033. https://doi.org/10.1594/PANGAEA.854142
  4. Fer, I; Darelius, E (2015): Ocean microstructure measurements in the Filchner Depression, Antarctica, during the RRS Ernest Shackleton cruise ES060. https://doi.org/10.1594/PANGAEA.854126