Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland)
In April 2015, an ice-tethered conductivity–temperature–depth (CTD) profiler and a down-looking acoustic Doppler current profiler (ADCP) were deployed from the landfast ice near the tidewater glacier terminus of the Flade Isblink Glacier in the Wandel Sea, NE Greenland. The 3-week time series showed...
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Copernicus Publications
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Online Access: | https://doi.org/10.5194/os-13-947-2017 https://www.ocean-sci.net/13/947/2017/os-13-947-2017.pdf https://doaj.org/article/33cbf29de5b3495399e12fac9b5610ff |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:33cbf29de5b3495399e12fac9b5610ff 2023-05-15T16:21:15+02:00 Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) S. Kirillov I. Dmitrenko S. Rysgaard D. Babb L. Toudal Pedersen J. Ehn J. Bendtsen D. Barber 2017-11-01 https://doi.org/10.5194/os-13-947-2017 https://www.ocean-sci.net/13/947/2017/os-13-947-2017.pdf https://doaj.org/article/33cbf29de5b3495399e12fac9b5610ff en eng Copernicus Publications doi:10.5194/os-13-947-2017 1812-0784 1812-0792 https://www.ocean-sci.net/13/947/2017/os-13-947-2017.pdf https://doaj.org/article/33cbf29de5b3495399e12fac9b5610ff undefined Ocean Science, Vol 13, Pp 947-959 (2017) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/os-13-947-2017 2023-01-22T19:11:13Z In April 2015, an ice-tethered conductivity–temperature–depth (CTD) profiler and a down-looking acoustic Doppler current profiler (ADCP) were deployed from the landfast ice near the tidewater glacier terminus of the Flade Isblink Glacier in the Wandel Sea, NE Greenland. The 3-week time series showed that water dynamics and the thermohaline structure were modified considerably during a storm event on 22–24 April, when northerly winds exceeded 15 m s−1. The storm initiated downwelling-like water dynamics characterized by on-shore water transport in the surface (0–40 m) layer and compensating offshore flow at intermediate depths. After the storm, currents reversed in both layers, and the relaxation phase of downwelling lasted ∼ 4 days. Although current velocities did not exceed 5 cm s−1, the enhanced circulation during the storm caused cold turbid intrusions at 75–95 m depth, which are likely attributable to subglacial water from the Flade Isblink Ice Cap. It was also found that the semidiurnal periodicities in the temperature and salinity time series were associated with the lunar semidiurnal tidal flow. The vertical structure of tidal currents corresponded to the first baroclinic mode of the internal tide with a velocity minimum at ∼ 40 m. The tidal ellipses rotate in opposite directions above and below this depth and cause a divergence of tidal flow, which was observed to induce semidiurnal internal waves of about 3 m height at the front of the glacier terminus. Our findings provide evidence that shelf–basin interaction and tidal forcing can potentially modify coastal Wandel Sea waters even though they are isolated from the atmosphere by landfast sea ice almost year-round. The northerly storms over the continental slope cause an enhanced circulation facilitating a release of cold and turbid subglacial water to the shelf. The tidal flow may contribute to the removal of such water from the glacial terminus. Article in Journal/Newspaper glacier Greenland Ice cap Sea ice Tidewater Wandel Sea Unknown Flade Isblink ENVELOPE(-15.000,-15.000,81.583,81.583) Greenland Wandel ENVELOPE(-64.000,-64.000,-65.083,-65.083) Ocean Science 13 6 947 959 |
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Open Polar |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir S. Kirillov I. Dmitrenko S. Rysgaard D. Babb L. Toudal Pedersen J. Ehn J. Bendtsen D. Barber Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) |
topic_facet |
geo envir |
description |
In April 2015, an ice-tethered conductivity–temperature–depth (CTD) profiler and a down-looking acoustic Doppler current profiler (ADCP) were deployed from the landfast ice near the tidewater glacier terminus of the Flade Isblink Glacier in the Wandel Sea, NE Greenland. The 3-week time series showed that water dynamics and the thermohaline structure were modified considerably during a storm event on 22–24 April, when northerly winds exceeded 15 m s−1. The storm initiated downwelling-like water dynamics characterized by on-shore water transport in the surface (0–40 m) layer and compensating offshore flow at intermediate depths. After the storm, currents reversed in both layers, and the relaxation phase of downwelling lasted ∼ 4 days. Although current velocities did not exceed 5 cm s−1, the enhanced circulation during the storm caused cold turbid intrusions at 75–95 m depth, which are likely attributable to subglacial water from the Flade Isblink Ice Cap. It was also found that the semidiurnal periodicities in the temperature and salinity time series were associated with the lunar semidiurnal tidal flow. The vertical structure of tidal currents corresponded to the first baroclinic mode of the internal tide with a velocity minimum at ∼ 40 m. The tidal ellipses rotate in opposite directions above and below this depth and cause a divergence of tidal flow, which was observed to induce semidiurnal internal waves of about 3 m height at the front of the glacier terminus. Our findings provide evidence that shelf–basin interaction and tidal forcing can potentially modify coastal Wandel Sea waters even though they are isolated from the atmosphere by landfast sea ice almost year-round. The northerly storms over the continental slope cause an enhanced circulation facilitating a release of cold and turbid subglacial water to the shelf. The tidal flow may contribute to the removal of such water from the glacial terminus. |
format |
Article in Journal/Newspaper |
author |
S. Kirillov I. Dmitrenko S. Rysgaard D. Babb L. Toudal Pedersen J. Ehn J. Bendtsen D. Barber |
author_facet |
S. Kirillov I. Dmitrenko S. Rysgaard D. Babb L. Toudal Pedersen J. Ehn J. Bendtsen D. Barber |
author_sort |
S. Kirillov |
title |
Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) |
title_short |
Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) |
title_full |
Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) |
title_fullStr |
Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) |
title_full_unstemmed |
Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) |
title_sort |
storm-induced water dynamics and thermohaline structure at the tidewater flade isblink glacier outlet to the wandel sea (ne greenland) |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/os-13-947-2017 https://www.ocean-sci.net/13/947/2017/os-13-947-2017.pdf https://doaj.org/article/33cbf29de5b3495399e12fac9b5610ff |
long_lat |
ENVELOPE(-15.000,-15.000,81.583,81.583) ENVELOPE(-64.000,-64.000,-65.083,-65.083) |
geographic |
Flade Isblink Greenland Wandel |
geographic_facet |
Flade Isblink Greenland Wandel |
genre |
glacier Greenland Ice cap Sea ice Tidewater Wandel Sea |
genre_facet |
glacier Greenland Ice cap Sea ice Tidewater Wandel Sea |
op_source |
Ocean Science, Vol 13, Pp 947-959 (2017) |
op_relation |
doi:10.5194/os-13-947-2017 1812-0784 1812-0792 https://www.ocean-sci.net/13/947/2017/os-13-947-2017.pdf https://doaj.org/article/33cbf29de5b3495399e12fac9b5610ff |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/os-13-947-2017 |
container_title |
Ocean Science |
container_volume |
13 |
container_issue |
6 |
container_start_page |
947 |
op_container_end_page |
959 |
_version_ |
1766009268592443392 |