Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica
Analyses of shallow cores obtained at the European Project for Ice Coring in Antarctica (EPICA) drilling site Kohnen station (75°00'S, 00°04'E; 2892 m a.s.l.) on the plateau of Dronning Maud Land reveal the presence of conserved snow dunes in the firn. In situ observations during three dun...
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-589 https://doi.org/10.3189/002214310794457272 |
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ftncar:oai:drupal-site.org:articles_10800 2023-07-30T03:58:13+02:00 Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica Birnbaum, Gerit (author) Freitag, Johannes (author) Brauner, Ralf (author) König-Langlo, Gert (author) Schulz, Elisabeth (author) Kipfstuhl, Sepp (author) Oerter, Hans (author) Reijmer, Catharina (author) Schlosser, Elisabeth (author) Faria, Sergio (author) Ries, Hinnerk (author) Loose, Bernd (author) Herber, Andreas (author) Duda, Michael (author) Powers, Jordan (author) Manning, Kevin (author) Van Den Broeke, Michiel (author) 2010-12-01 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-589 https://doi.org/10.3189/002214310794457272 en eng International Glaciological Society Journal of Glaciology http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-589 doi:10.3189/002214310794457272 ark:/85065/d7c829v0 Copyright 2010 International Glaciological Society. Text article 2010 ftncar https://doi.org/10.3189/002214310794457272 2023-07-17T18:22:50Z Analyses of shallow cores obtained at the European Project for Ice Coring in Antarctica (EPICA) drilling site Kohnen station (75°00'S, 00°04'E; 2892 m a.s.l.) on the plateau of Dronning Maud Land reveal the presence of conserved snow dunes in the firn. In situ observations during three dune formation events in the 2005/06 austral summer at Kohnen station show that these periods were characterized by a phase of 2 or 3 days with snowdrift prior to dune formation which only occurred during high wind speeds of >10 m s⁻¹ at 2 m height caused by the influence of a low-pressure system. The dune surface coverage after a formation event varied between 5% and 15%, with a typical dune size of (4±2) m × (8±3) m, a maximum height of 0.2±0.1 m and a periodicity length of about 30 m. The mean density within a snow dune varied between 380 and 500 kg m⁻³, whereas the mean density at the surrounding surface was 330±5 kg m⁻³. The firn cores covering a time-span of 22±2 years reveal that approximately three to eight events per year occurred, during which snow dunes had been formed and were preserved in the firn. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land EPICA Journal of Glaciology OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Austral Dronning Maud Land Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Kohnen Station ENVELOPE(0.000,0.000,-75.000,-75.000) Journal of Glaciology 56 199 891 902 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Analyses of shallow cores obtained at the European Project for Ice Coring in Antarctica (EPICA) drilling site Kohnen station (75°00'S, 00°04'E; 2892 m a.s.l.) on the plateau of Dronning Maud Land reveal the presence of conserved snow dunes in the firn. In situ observations during three dune formation events in the 2005/06 austral summer at Kohnen station show that these periods were characterized by a phase of 2 or 3 days with snowdrift prior to dune formation which only occurred during high wind speeds of >10 m s⁻¹ at 2 m height caused by the influence of a low-pressure system. The dune surface coverage after a formation event varied between 5% and 15%, with a typical dune size of (4±2) m × (8±3) m, a maximum height of 0.2±0.1 m and a periodicity length of about 30 m. The mean density within a snow dune varied between 380 and 500 kg m⁻³, whereas the mean density at the surrounding surface was 330±5 kg m⁻³. The firn cores covering a time-span of 22±2 years reveal that approximately three to eight events per year occurred, during which snow dunes had been formed and were preserved in the firn. |
author2 |
Birnbaum, Gerit (author) Freitag, Johannes (author) Brauner, Ralf (author) König-Langlo, Gert (author) Schulz, Elisabeth (author) Kipfstuhl, Sepp (author) Oerter, Hans (author) Reijmer, Catharina (author) Schlosser, Elisabeth (author) Faria, Sergio (author) Ries, Hinnerk (author) Loose, Bernd (author) Herber, Andreas (author) Duda, Michael (author) Powers, Jordan (author) Manning, Kevin (author) Van Den Broeke, Michiel (author) |
format |
Article in Journal/Newspaper |
title |
Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica |
spellingShingle |
Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica |
title_short |
Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica |
title_full |
Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica |
title_fullStr |
Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica |
title_full_unstemmed |
Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica |
title_sort |
strong-wind events and their influence on the formation of snow dunes: observations from kohnen station, dronning maud land, antarctica |
publisher |
International Glaciological Society |
publishDate |
2010 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-589 https://doi.org/10.3189/002214310794457272 |
long_lat |
ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.000,0.000,-75.000,-75.000) |
geographic |
Austral Dronning Maud Land Kohnen Kohnen Station |
geographic_facet |
Austral Dronning Maud Land Kohnen Kohnen Station |
genre |
Antarc* Antarctica Dronning Maud Land EPICA Journal of Glaciology |
genre_facet |
Antarc* Antarctica Dronning Maud Land EPICA Journal of Glaciology |
op_relation |
Journal of Glaciology http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-589 doi:10.3189/002214310794457272 ark:/85065/d7c829v0 |
op_rights |
Copyright 2010 International Glaciological Society. |
op_doi |
https://doi.org/10.3189/002214310794457272 |
container_title |
Journal of Glaciology |
container_volume |
56 |
container_issue |
199 |
container_start_page |
891 |
op_container_end_page |
902 |
_version_ |
1772821082735116288 |