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...
Published in: | Ocean Science |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2017
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/da/publications/storminduced-water-dynamics-and-thermohaline-structure-at-the-tidewater-flade-isblink-glacier-outlet-to-the-wandel-sea-ne-greenland(337f015b-3bbd-4427-9d32-475b20d2a685).html https://doi.org/10.5194/os-13-947-2017 https://pure.au.dk/ws/files/121561292/os_13_947_2017.pdf http://www.scopus.com/inward/record.url?scp=85035010021&partnerID=8YFLogxK |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/337f015b-3bbd-4427-9d32-475b20d2a685 |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/337f015b-3bbd-4427-9d32-475b20d2a685 2023-05-15T16:03:57+02:00 Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) Kirillov, Sergei Dmitrenko, Igor Rysgaard, Søren Babb, David Toudal Pedersen, Leif Ehn, Jens Bendtsen, Jørgen Barber, David 2017 application/pdf https://pure.au.dk/portal/da/publications/storminduced-water-dynamics-and-thermohaline-structure-at-the-tidewater-flade-isblink-glacier-outlet-to-the-wandel-sea-ne-greenland(337f015b-3bbd-4427-9d32-475b20d2a685).html https://doi.org/10.5194/os-13-947-2017 https://pure.au.dk/ws/files/121561292/os_13_947_2017.pdf http://www.scopus.com/inward/record.url?scp=85035010021&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Kirillov , S , Dmitrenko , I , Rysgaard , S , Babb , D , Toudal Pedersen , L , Ehn , J , Bendtsen , J & Barber , D 2017 , ' Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) ' , Ocean Science , vol. 13 , no. 6 , pp. 947-959 . https://doi.org/10.5194/os-13-947-2017 EAST GREENLAND FRAM STRAIT NORTHEAST GREENLAND CONTINENTAL-SHELF FRESH-WATER ICE-SHEET FJORD CIRCULATION LAKE article 2017 ftuniaarhuspubl https://doi.org/10.5194/os-13-947-2017 2023-03-08T23:56:06Z 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 ms(-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 down-welling lasted similar to 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 similar to 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 East Greenland Fram Strait glacier Greenland Ice cap Ice Sheet Sea ice Tidewater Wandel Sea Aarhus University: Research 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 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
EAST GREENLAND FRAM STRAIT NORTHEAST GREENLAND CONTINENTAL-SHELF FRESH-WATER ICE-SHEET FJORD CIRCULATION LAKE |
spellingShingle |
EAST GREENLAND FRAM STRAIT NORTHEAST GREENLAND CONTINENTAL-SHELF FRESH-WATER ICE-SHEET FJORD CIRCULATION LAKE Kirillov, Sergei Dmitrenko, Igor Rysgaard, Søren Babb, David Toudal Pedersen, Leif Ehn, Jens Bendtsen, Jørgen Barber, David Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) |
topic_facet |
EAST GREENLAND FRAM STRAIT NORTHEAST GREENLAND CONTINENTAL-SHELF FRESH-WATER ICE-SHEET FJORD CIRCULATION LAKE |
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 ms(-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 down-welling lasted similar to 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 similar to 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 |
Kirillov, Sergei Dmitrenko, Igor Rysgaard, Søren Babb, David Toudal Pedersen, Leif Ehn, Jens Bendtsen, Jørgen Barber, David |
author_facet |
Kirillov, Sergei Dmitrenko, Igor Rysgaard, Søren Babb, David Toudal Pedersen, Leif Ehn, Jens Bendtsen, Jørgen Barber, David |
author_sort |
Kirillov, Sergei |
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) |
publishDate |
2017 |
url |
https://pure.au.dk/portal/da/publications/storminduced-water-dynamics-and-thermohaline-structure-at-the-tidewater-flade-isblink-glacier-outlet-to-the-wandel-sea-ne-greenland(337f015b-3bbd-4427-9d32-475b20d2a685).html https://doi.org/10.5194/os-13-947-2017 https://pure.au.dk/ws/files/121561292/os_13_947_2017.pdf http://www.scopus.com/inward/record.url?scp=85035010021&partnerID=8YFLogxK |
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 |
East Greenland Fram Strait glacier Greenland Ice cap Ice Sheet Sea ice Tidewater Wandel Sea |
genre_facet |
East Greenland Fram Strait glacier Greenland Ice cap Ice Sheet Sea ice Tidewater Wandel Sea |
op_source |
Kirillov , S , Dmitrenko , I , Rysgaard , S , Babb , D , Toudal Pedersen , L , Ehn , J , Bendtsen , J & Barber , D 2017 , ' Storm-induced water dynamics and thermohaline structure at the tidewater Flade Isblink Glacier outlet to the Wandel Sea (NE Greenland) ' , Ocean Science , vol. 13 , no. 6 , pp. 947-959 . https://doi.org/10.5194/os-13-947-2017 |
op_rights |
info:eu-repo/semantics/openAccess |
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_ |
1766399639299293184 |