Oslo fjord, 20-23 June, 2011, CTD and Dissipation rates
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Creator/Principal investigator(s)
Lars Arneborg - University of Gothenburg, Department of Marine Sciences
Description
Vertical profiles of stratification and dissipation rates of turbulent kinetic energy along transects. The data were collected during the period June 20 to June 23, 2011 on board the R/V Trygve Braarud. The wind conditions were relatively calm during the data collection. The maximum measured wind speed at station Gullholmen (59°26.11’N 10°34.68’) was 8.4 m/s. A MSS90L profiler (MSS) was dropped continuously from the stern of the ship as it cruised at low speeds (~1 knot). The MSS90L is a loosely tethered profiler with standard conductivity, temperature and pressure (CTD) sensors as well as two airfoil shear probes (PNS06) sampling at 1024 Hz with 16 bit resolution while the profiler is freely falling through the water with a sinking speed of about 0.6-0.7 m s-1. A more detailed discussion of an earlier version of the instrument can be found in Prandke and Stips (1998). A sensor protecion guard allowd full depth profiles down to 0.1 m above the bottom, with exception of the upper 2-3 meters which were influenced by vessel turbulence and removed. A total of 15 transects were performed; 13 along-
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Creator/Principal investigator(s)
Lars Arneborg - University of Gothenburg, Department of Marine Sciences
Identifiers
SND-ID: ECDS 0113
Description
Vertical profiles of stratification and dissipation rates of turbulent kinetic energy along transects. The data were collected during the period June 20 to June 23, 2011 on board the R/V Trygve Braarud. The wind conditions were relatively calm during the data collection. The maximum measured wind speed at station Gullholmen (59°26.11’N 10°34.68’) was 8.4 m/s. A MSS90L profiler (MSS) was dropped continuously from the stern of the ship as it cruised at low speeds (~1 knot). The MSS90L is a loosely tethered profiler with standard conductivity, temperature and pressure (CTD) sensors as well as two airfoil shear probes (PNS06) sampling at 1024 Hz with 16 bit resolution while the profiler is freely falling through the water with a sinking speed of about 0.6-0.7 m s-1. A more detailed discussion of an earlier version of the instrument can be found in Prandke and Stips (1998). A sensor protecion guard allowd full depth profiles down to 0.1 m above the bottom, with exception of the upper 2-3 meters which were influenced by vessel turbulence and removed. A total of 15 transects were performed; 13 along-
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English
Time period(s) investigated
2011-06-20 — 2011-06-23
Geographic spread
Geographic location: Norway
Geographic description: Oslo fjord
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No
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Publications
Staalstrøm, A., Arneborg, L., Liljebladh, B., & Broström, G. (2015). Observations of Turbulence Caused by a Combination of Tides and Mean Baroclinic Flow over a Fjord Sill. Journal of Physical Oceanography, 45(2), 355–368. https://doi.org/10.1175/jpo-d-13-0200.1
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Oslo fjord, 20-23 June, 2011, CTD and Dissipation rates
Citation
Creator/Principal investigator(s)
Lars Arneborg - University of Gothenburg, Department of Marine Sciences
Description
Dissipation rates: Dissipation rates of turbulent kinetic energy were obtained from the microstructure shear data using standard methods, as describe in more detail by e.g. Arneborg and Liljebladh (2009). Basically, the shear probes measure how one transverse velocity component changes along the path of the profiler. From the shear variance one can calculate the dissipation rate under the assumption of isotropic turbulence. However, since the sensors do not cover the complete wave-number range o
... Show more..Data format / data structure
Numeric