The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91
Observations performed in the melting zone of the Greenland ice sheet and over the adjacent tundra in the summer of 1991 are described. The experimental area is the region near St ndre Stromfjord (67°N, 54°W), which is relatively dry and sunny, resulting in the highest mean temperature in Greenland...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/22203 2023-07-23T04:14:34+02:00 The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91 Broeke, M.R. van den Duynkerke, P.G. Oerlemans, J. 1994 image/pdf https://dspace.library.uu.nl/handle/1874/22203 en eng 0921-8181 https://dspace.library.uu.nl/handle/1874/22203 info:eu-repo/semantics/OpenAccess Natuur- en Sterrenkunde Article 1994 ftunivutrecht 2023-07-01T23:20:27Z Observations performed in the melting zone of the Greenland ice sheet and over the adjacent tundra in the summer of 1991 are described. The experimental area is the region near St ndre Stromfjord (67°N, 54°W), which is relatively dry and sunny, resulting in the highest mean temperature in Greenland in July. The katabatic wind is dominantly present over the ice; it influences the energy balance near the surface through the sensible and latent heat flux. With the aid of a tethered balloon it was observed that the thickness of the katabatic layer is typically 100 to 200 m. An interesting aspect of the katabatic wind appears to be the acceleration of the flow in the late afternoon due to the large temperature gradient at the border between tundra and ice. Further on the ice, this effect is no longer important for the dynamics of the katabatic flow. The net radiation is the main driving force there. An attempt is made to estimate the importance of these thermal wind effects compared to the buoyancy forcing. It is concluded that near the edge of the ice surface winds are driven by the horizontal pressure gradient, imposed by the thermal contrast between tundra and ice. A comparison is made between the observed katabatic wind and those in the Antarctic. Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet Tundra Utrecht University Repository Antarctic Greenland The Antarctic |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Natuur- en Sterrenkunde |
spellingShingle |
Natuur- en Sterrenkunde Broeke, M.R. van den Duynkerke, P.G. Oerlemans, J. The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91 |
topic_facet |
Natuur- en Sterrenkunde |
description |
Observations performed in the melting zone of the Greenland ice sheet and over the adjacent tundra in the summer of 1991 are described. The experimental area is the region near St ndre Stromfjord (67°N, 54°W), which is relatively dry and sunny, resulting in the highest mean temperature in Greenland in July. The katabatic wind is dominantly present over the ice; it influences the energy balance near the surface through the sensible and latent heat flux. With the aid of a tethered balloon it was observed that the thickness of the katabatic layer is typically 100 to 200 m. An interesting aspect of the katabatic wind appears to be the acceleration of the flow in the late afternoon due to the large temperature gradient at the border between tundra and ice. Further on the ice, this effect is no longer important for the dynamics of the katabatic flow. The net radiation is the main driving force there. An attempt is made to estimate the importance of these thermal wind effects compared to the buoyancy forcing. It is concluded that near the edge of the ice surface winds are driven by the horizontal pressure gradient, imposed by the thermal contrast between tundra and ice. A comparison is made between the observed katabatic wind and those in the Antarctic. |
format |
Article in Journal/Newspaper |
author |
Broeke, M.R. van den Duynkerke, P.G. Oerlemans, J. |
author_facet |
Broeke, M.R. van den Duynkerke, P.G. Oerlemans, J. |
author_sort |
Broeke, M.R. van den |
title |
The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91 |
title_short |
The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91 |
title_full |
The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91 |
title_fullStr |
The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91 |
title_full_unstemmed |
The observed katabatic flow at the edge of the Greenland ice sheet during GIMEX-91 |
title_sort |
observed katabatic flow at the edge of the greenland ice sheet during gimex-91 |
publishDate |
1994 |
url |
https://dspace.library.uu.nl/handle/1874/22203 |
geographic |
Antarctic Greenland The Antarctic |
geographic_facet |
Antarctic Greenland The Antarctic |
genre |
Antarc* Antarctic Greenland Ice Sheet Tundra |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet Tundra |
op_relation |
0921-8181 https://dspace.library.uu.nl/handle/1874/22203 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772185753701318656 |