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Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume
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| Zeitschriftentitel: | Journal of Geophysical Research: Oceans |
|---|---|
| Personen und Körperschaften: | , , , , , , |
| In: | Journal of Geophysical Research: Oceans, 121, 2016, 10, S. 7650-7672 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
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| Schlagwörter: |
| author_facet |
Schaffer, Janin Kanzow, Torsten Jochumsen, Kerstin Lackschewitz, Klas Tippenhauer, Sandra Zhurbas, Victor M. Quadfasel, Detlef Schaffer, Janin Kanzow, Torsten Jochumsen, Kerstin Lackschewitz, Klas Tippenhauer, Sandra Zhurbas, Victor M. Quadfasel, Detlef |
|---|---|
| author |
Schaffer, Janin Kanzow, Torsten Jochumsen, Kerstin Lackschewitz, Klas Tippenhauer, Sandra Zhurbas, Victor M. Quadfasel, Detlef |
| spellingShingle |
Schaffer, Janin Kanzow, Torsten Jochumsen, Kerstin Lackschewitz, Klas Tippenhauer, Sandra Zhurbas, Victor M. Quadfasel, Detlef Journal of Geophysical Research: Oceans Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Geochemistry and Petrology Geophysics Oceanography |
| author_sort |
schaffer, janin |
| spelling |
Schaffer, Janin Kanzow, Torsten Jochumsen, Kerstin Lackschewitz, Klas Tippenhauer, Sandra Zhurbas, Victor M. Quadfasel, Detlef 2169-9275 2169-9291 American Geophysical Union (AGU) Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Geochemistry and Petrology Geophysics Oceanography http://dx.doi.org/10.1002/2016jc011653 <jats:title>Abstract</jats:title><jats:p>The Denmark Strait Overflow (DSO) contributes roughly half to the total volume transport of the Nordic overflows. The overflow increases its volume by entraining ambient water as it descends into the subpolar North Atlantic, feeding into the deep branch of the Atlantic Meridional Overturning Circulation. In June 2012, a multiplatform experiment was carried out in the DSO plume on the continental slope off Greenland (180 km downstream of the sill in Denmark Strait), to observe the variability associated with the entrainment of ambient waters into the DSO plume. In this study, we report on two high‐dissipation events captured by an autonomous underwater vehicle (AUV) by horizontal profiling in the interfacial layer between the DSO plume and the ambient water. Strong dissipation of turbulent kinetic energy of O( <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0001.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0001" />) W kg<jats:sup>−1</jats:sup> was associated with enhanced small‐scale temperature variance at wavelengths between 0.05 and 500 m as deduced from a fast‐response thermistor. Isotherm displacement slope spectra reveal a wave number‐dependence characteristic of turbulence in the inertial‐convective subrange ( <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0002.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0002" />) at wavelengths between 0.14 and 100 m. The first event captured by the AUV was transient, and occurred near the edge of a bottom‐intensified energetic eddy. Our observations imply that both horizontal advection of warm water and vertical mixing of it into the plume are eddy‐driven and go hand in hand in entraining ambient water into the DSO plume. The second event was found to be a stationary feature on the upstream side of a topographic elevation located in the plume pathway. Flow‐topography interaction is suggested to drive the intense mixing at this site.</jats:p> Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the <scp>D</scp>enmark <scp>S</scp>trait <scp>O</scp>verflow plume Journal of Geophysical Research: Oceans |
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Journal of Geophysical Research: Oceans |
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| title |
Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_unstemmed |
Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_full |
Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_fullStr |
Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_full_unstemmed |
Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_short |
Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_sort |
enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the <scp>d</scp>enmark <scp>s</scp>trait <scp>o</scp>verflow plume |
| topic |
Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Geochemistry and Petrology Geophysics Oceanography |
| url |
http://dx.doi.org/10.1002/2016jc011653 |
| publishDate |
2016 |
| physical |
7650-7672 |
| description |
<jats:title>Abstract</jats:title><jats:p>The Denmark Strait Overflow (DSO) contributes roughly half to the total volume transport of the Nordic overflows. The overflow increases its volume by entraining ambient water as it descends into the subpolar North Atlantic, feeding into the deep branch of the Atlantic Meridional Overturning Circulation. In June 2012, a multiplatform experiment was carried out in the DSO plume on the continental slope off Greenland (180 km downstream of the sill in Denmark Strait), to observe the variability associated with the entrainment of ambient waters into the DSO plume. In this study, we report on two high‐dissipation events captured by an autonomous underwater vehicle (AUV) by horizontal profiling in the interfacial layer between the DSO plume and the ambient water. Strong dissipation of turbulent kinetic energy of O(
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0001.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0001" />) W kg<jats:sup>−1</jats:sup> was associated with enhanced small‐scale temperature variance at wavelengths between 0.05 and 500 m as deduced from a fast‐response thermistor. Isotherm displacement slope spectra reveal a wave number‐dependence characteristic of turbulence in the inertial‐convective subrange (
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0002.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0002" />) at wavelengths between 0.14 and 100 m. The first event captured by the AUV was transient, and occurred near the edge of a bottom‐intensified energetic eddy. Our observations imply that both horizontal advection of warm water and vertical mixing of it into the plume are eddy‐driven and go hand in hand in entraining ambient water into the DSO plume. The second event was found to be a stationary feature on the upstream side of a topographic elevation located in the plume pathway. Flow‐topography interaction is suggested to drive the intense mixing at this site.</jats:p> |
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| description | <jats:title>Abstract</jats:title><jats:p>The Denmark Strait Overflow (DSO) contributes roughly half to the total volume transport of the Nordic overflows. The overflow increases its volume by entraining ambient water as it descends into the subpolar North Atlantic, feeding into the deep branch of the Atlantic Meridional Overturning Circulation. In June 2012, a multiplatform experiment was carried out in the DSO plume on the continental slope off Greenland (180 km downstream of the sill in Denmark Strait), to observe the variability associated with the entrainment of ambient waters into the DSO plume. In this study, we report on two high‐dissipation events captured by an autonomous underwater vehicle (AUV) by horizontal profiling in the interfacial layer between the DSO plume and the ambient water. Strong dissipation of turbulent kinetic energy of O( <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0001.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0001" />) W kg<jats:sup>−1</jats:sup> was associated with enhanced small‐scale temperature variance at wavelengths between 0.05 and 500 m as deduced from a fast‐response thermistor. Isotherm displacement slope spectra reveal a wave number‐dependence characteristic of turbulence in the inertial‐convective subrange ( <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0002.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0002" />) at wavelengths between 0.14 and 100 m. The first event captured by the AUV was transient, and occurred near the edge of a bottom‐intensified energetic eddy. Our observations imply that both horizontal advection of warm water and vertical mixing of it into the plume are eddy‐driven and go hand in hand in entraining ambient water into the DSO plume. The second event was found to be a stationary feature on the upstream side of a topographic elevation located in the plume pathway. Flow‐topography interaction is suggested to drive the intense mixing at this site.</jats:p> |
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| spelling | Schaffer, Janin Kanzow, Torsten Jochumsen, Kerstin Lackschewitz, Klas Tippenhauer, Sandra Zhurbas, Victor M. Quadfasel, Detlef 2169-9275 2169-9291 American Geophysical Union (AGU) Earth and Planetary Sciences (miscellaneous) Space and Planetary Science Geochemistry and Petrology Geophysics Oceanography http://dx.doi.org/10.1002/2016jc011653 <jats:title>Abstract</jats:title><jats:p>The Denmark Strait Overflow (DSO) contributes roughly half to the total volume transport of the Nordic overflows. The overflow increases its volume by entraining ambient water as it descends into the subpolar North Atlantic, feeding into the deep branch of the Atlantic Meridional Overturning Circulation. In June 2012, a multiplatform experiment was carried out in the DSO plume on the continental slope off Greenland (180 km downstream of the sill in Denmark Strait), to observe the variability associated with the entrainment of ambient waters into the DSO plume. In this study, we report on two high‐dissipation events captured by an autonomous underwater vehicle (AUV) by horizontal profiling in the interfacial layer between the DSO plume and the ambient water. Strong dissipation of turbulent kinetic energy of O( <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0001.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0001" />) W kg<jats:sup>−1</jats:sup> was associated with enhanced small‐scale temperature variance at wavelengths between 0.05 and 500 m as deduced from a fast‐response thermistor. Isotherm displacement slope spectra reveal a wave number‐dependence characteristic of turbulence in the inertial‐convective subrange ( <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/jgrc21958-math-0002.png" xlink:title="urn:x-wiley:21699275:media:jgrc21958:jgrc21958-math-0002" />) at wavelengths between 0.14 and 100 m. The first event captured by the AUV was transient, and occurred near the edge of a bottom‐intensified energetic eddy. Our observations imply that both horizontal advection of warm water and vertical mixing of it into the plume are eddy‐driven and go hand in hand in entraining ambient water into the DSO plume. The second event was found to be a stationary feature on the upstream side of a topographic elevation located in the plume pathway. Flow‐topography interaction is suggested to drive the intense mixing at this site.</jats:p> Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the <scp>D</scp>enmark <scp>S</scp>trait <scp>O</scp>verflow plume Journal of Geophysical Research: Oceans |
| spellingShingle | Schaffer, Janin, Kanzow, Torsten, Jochumsen, Kerstin, Lackschewitz, Klas, Tippenhauer, Sandra, Zhurbas, Victor M., Quadfasel, Detlef, Journal of Geophysical Research: Oceans, Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume, Earth and Planetary Sciences (miscellaneous), Space and Planetary Science, Geochemistry and Petrology, Geophysics, Oceanography |
| title | Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_full | Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_fullStr | Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_full_unstemmed | Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_short | Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| title_sort | enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the <scp>d</scp>enmark <scp>s</scp>trait <scp>o</scp>verflow plume |
| title_unstemmed | Enhanced turbulence driven by mesoscale motions and flow‐topography interaction in the Denmark Strait Overflow plume |
| topic | Earth and Planetary Sciences (miscellaneous), Space and Planetary Science, Geochemistry and Petrology, Geophysics, Oceanography |
| url | http://dx.doi.org/10.1002/2016jc011653 |