The Ronne polynya of 1997/98: observations of air-ice-ocean interaction
Final published version The Ronne polynya formed in the Weddell Sea, Antarctica, during the period November 1997-February 1998 to an extent not seen previously in the 25 years of all-weather satellite observations. The vessel HMS Endurance traversed the polynya region and took sea-ice, physical ocea...
Published in: | Annals of Glaciology |
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International Glaciological Society
2001
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Online Access: | http://udspace.udel.edu/handle/19716/16750 https://doi.org/10.3189/172756401781818725 |
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ftunivdelaware:oai:udspace.udel.edu:19716/16750 2024-04-28T07:55:22+00:00 The Ronne polynya of 1997/98: observations of air-ice-ocean interaction Ackley, Stephen F. Geiger, Cathleen A. King, J. C. (John Christopher), 1955- Hunke, E. C. Comiso, J. Ackley, S. F., Geiger, Cathleen A., King, J. C., Hunke, E. C., Comiso, J. Geiger, Cathleen A. 2001 application/pdf http://udspace.udel.edu/handle/19716/16750 https://doi.org/10.3189/172756401781818725 English (United States) eng unknown International Glaciological Society Ackley, S. F., Geiger, C. A., King, J. C., Hunke, E. C., & Comiso, J. (2001). The ronne polynya of 1997/98: Observations of air-ice-ocean interaction. Annals of Glaciology, Vol 33, 425-429. doi:10.3189/172756401781818725 0260-3055 http://udspace.udel.edu/handle/19716/16750 doi:10.3189/172756401781818725 Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. Annals of Glaciology http://www.igsoc.org/annals/ Article 2001 ftunivdelaware https://doi.org/10.3189/172756401781818725 2024-04-09T23:30:48Z Final published version The Ronne polynya formed in the Weddell Sea, Antarctica, during the period November 1997-February 1998 to an extent not seen previously in the 25 years of all-weather satellite observations. The vessel HMS Endurance traversed the polynya region and took sea-ice, physical oceanographic and meteorological measurements during January and early February 1998. These observations, together with satellite imagery and weather records, were analyzed to determine the causes of the anomalous condition observed and to provide comparisons for numerical modeling experiments. The polynya area, analyzed from satellite imagery, showed a linear, nearly constant, increase with time from mid-November 1997 through February 1998. It had a maximum open-water area of 3 X 10(5) km(2) and extended 500 km north of the Ronne Ice Shelf (at 76degrees S) to 70degrees S. The ice and snow structure of floes at (lie northern edge of the polynya showed the ice there had formed in the previous mid- to late winter October 1997 or earlier) and had been advected there either from the eastern Weddell Sea or from the front of the Ronne Ice Shelf. Analyses of the wind fields showed anomalous spring -summer wind fields in the polynya year, with a strong southerly to southwesterly component compared to the mean easterly winds typical of summer conditions. These southerly wind conditions, ill both magnitude and direction, therefore account for the drift of ice northward. The predominant summer easterly winds usually fill the southern Weddell Sea with ice from the east, and the high-albedo surfaces reflect (lie solar radiation, preventing warming of the surface ocean waters and consequent sea-ice melt. Instead, high incident solar radiation From November 1997 to February 1998 was absorbed by (lie open water, rather than being reflected, thereby both melting ice and preventing ice formation, and thereby sustaining the polynya. We conclude that open-water-albedo feedback is necessary to allow the observed polynya formation, since ... Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea The University of Delaware Library Institutional Repository Annals of Glaciology 33 425 429 |
institution |
Open Polar |
collection |
The University of Delaware Library Institutional Repository |
op_collection_id |
ftunivdelaware |
language |
English unknown |
description |
Final published version The Ronne polynya formed in the Weddell Sea, Antarctica, during the period November 1997-February 1998 to an extent not seen previously in the 25 years of all-weather satellite observations. The vessel HMS Endurance traversed the polynya region and took sea-ice, physical oceanographic and meteorological measurements during January and early February 1998. These observations, together with satellite imagery and weather records, were analyzed to determine the causes of the anomalous condition observed and to provide comparisons for numerical modeling experiments. The polynya area, analyzed from satellite imagery, showed a linear, nearly constant, increase with time from mid-November 1997 through February 1998. It had a maximum open-water area of 3 X 10(5) km(2) and extended 500 km north of the Ronne Ice Shelf (at 76degrees S) to 70degrees S. The ice and snow structure of floes at (lie northern edge of the polynya showed the ice there had formed in the previous mid- to late winter October 1997 or earlier) and had been advected there either from the eastern Weddell Sea or from the front of the Ronne Ice Shelf. Analyses of the wind fields showed anomalous spring -summer wind fields in the polynya year, with a strong southerly to southwesterly component compared to the mean easterly winds typical of summer conditions. These southerly wind conditions, ill both magnitude and direction, therefore account for the drift of ice northward. The predominant summer easterly winds usually fill the southern Weddell Sea with ice from the east, and the high-albedo surfaces reflect (lie solar radiation, preventing warming of the surface ocean waters and consequent sea-ice melt. Instead, high incident solar radiation From November 1997 to February 1998 was absorbed by (lie open water, rather than being reflected, thereby both melting ice and preventing ice formation, and thereby sustaining the polynya. We conclude that open-water-albedo feedback is necessary to allow the observed polynya formation, since ... |
author2 |
Ackley, S. F., Geiger, Cathleen A., King, J. C., Hunke, E. C., Comiso, J. Geiger, Cathleen A. |
format |
Article in Journal/Newspaper |
author |
Ackley, Stephen F. Geiger, Cathleen A. King, J. C. (John Christopher), 1955- Hunke, E. C. Comiso, J. |
spellingShingle |
Ackley, Stephen F. Geiger, Cathleen A. King, J. C. (John Christopher), 1955- Hunke, E. C. Comiso, J. The Ronne polynya of 1997/98: observations of air-ice-ocean interaction |
author_facet |
Ackley, Stephen F. Geiger, Cathleen A. King, J. C. (John Christopher), 1955- Hunke, E. C. Comiso, J. |
author_sort |
Ackley, Stephen F. |
title |
The Ronne polynya of 1997/98: observations of air-ice-ocean interaction |
title_short |
The Ronne polynya of 1997/98: observations of air-ice-ocean interaction |
title_full |
The Ronne polynya of 1997/98: observations of air-ice-ocean interaction |
title_fullStr |
The Ronne polynya of 1997/98: observations of air-ice-ocean interaction |
title_full_unstemmed |
The Ronne polynya of 1997/98: observations of air-ice-ocean interaction |
title_sort |
ronne polynya of 1997/98: observations of air-ice-ocean interaction |
publisher |
International Glaciological Society |
publishDate |
2001 |
url |
http://udspace.udel.edu/handle/19716/16750 https://doi.org/10.3189/172756401781818725 |
genre |
Annals of Glaciology Antarc* Antarctica Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
genre_facet |
Annals of Glaciology Antarc* Antarctica Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
op_source |
Annals of Glaciology http://www.igsoc.org/annals/ |
op_relation |
Ackley, S. F., Geiger, C. A., King, J. C., Hunke, E. C., & Comiso, J. (2001). The ronne polynya of 1997/98: Observations of air-ice-ocean interaction. Annals of Glaciology, Vol 33, 425-429. doi:10.3189/172756401781818725 0260-3055 http://udspace.udel.edu/handle/19716/16750 doi:10.3189/172756401781818725 |
op_rights |
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. |
op_doi |
https://doi.org/10.3189/172756401781818725 |
container_title |
Annals of Glaciology |
container_volume |
33 |
container_start_page |
425 |
op_container_end_page |
429 |
_version_ |
1797579733474476032 |