Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08
Polynyas in the Laptev Sea are examined with respect to recurrence and inter-annual wintertime ice production. We use a polynya classification method based on passive microwave satellite data to derive daily polynya area from long-term sea-ice concentrations. This provides insight into the spatial a...
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ftoceanrep:oai:oceanrep.geomar.de:26634 2023-05-15T17:07:06+02:00 Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08 Willmes, Sascha Adams, Susanne Schröder, David Heinemann, Günther 2011 text https://oceanrep.geomar.de/id/eprint/26634/ https://oceanrep.geomar.de/id/eprint/26634/1/EGU2011-1723.pdf http://meetingorganizer.copernicus.org/EGU2011/EGU2011-1723.pdf en eng https://oceanrep.geomar.de/id/eprint/26634/1/EGU2011-1723.pdf Willmes, S., Adams, S., Schröder, D. and Heinemann, G. (2011) Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08. [Poster] In: EGU General Assembly 2011. , 03.04.-08.04.2011, Vienna, Austria . cc_by_nc Conference or Workshop Item NonPeerReviewed 2011 ftoceanrep 2023-04-07T15:16:17Z Polynyas in the Laptev Sea are examined with respect to recurrence and inter-annual wintertime ice production. We use a polynya classification method based on passive microwave satellite data to derive daily polynya area from long-term sea-ice concentrations. This provides insight into the spatial and temporal variability of open water and thin ice regions on the Laptev Sea shelf. Using thermal infrared satellite data to derive an empirical thin ice distribution within the thickness range from 0 to 20 cm, we calculate daily average surface heat loss and the resulting wintertime ice formation within the Laptev Sea polynyas between 1979 and 2008 using NCEP reanalysis data as atmospheric forcing. Results indicate that previous studies significantly overestimate the contribution of polynyas to the ice production in the Laptev Sea. Average wintertime ice production in polynyas amounts to approximately 55 km3 +- 27% and is mostly determined by the polynya area, wind speed and associated large-scale circulation patterns. No trend in ice production could be detected in the period from 1979/80 to 2007/08. Conference Object laptev Laptev Sea Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Laptev Sea |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Polynyas in the Laptev Sea are examined with respect to recurrence and inter-annual wintertime ice production. We use a polynya classification method based on passive microwave satellite data to derive daily polynya area from long-term sea-ice concentrations. This provides insight into the spatial and temporal variability of open water and thin ice regions on the Laptev Sea shelf. Using thermal infrared satellite data to derive an empirical thin ice distribution within the thickness range from 0 to 20 cm, we calculate daily average surface heat loss and the resulting wintertime ice formation within the Laptev Sea polynyas between 1979 and 2008 using NCEP reanalysis data as atmospheric forcing. Results indicate that previous studies significantly overestimate the contribution of polynyas to the ice production in the Laptev Sea. Average wintertime ice production in polynyas amounts to approximately 55 km3 +- 27% and is mostly determined by the polynya area, wind speed and associated large-scale circulation patterns. No trend in ice production could be detected in the period from 1979/80 to 2007/08. |
format |
Conference Object |
author |
Willmes, Sascha Adams, Susanne Schröder, David Heinemann, Günther |
spellingShingle |
Willmes, Sascha Adams, Susanne Schröder, David Heinemann, Günther Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08 |
author_facet |
Willmes, Sascha Adams, Susanne Schröder, David Heinemann, Günther |
author_sort |
Willmes, Sascha |
title |
Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08 |
title_short |
Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08 |
title_full |
Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08 |
title_fullStr |
Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08 |
title_full_unstemmed |
Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08 |
title_sort |
spatio-temporal variability of polynya dynamics and ice production in the laptev sea between winters of 1979/80 and 2007/08 |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/26634/ https://oceanrep.geomar.de/id/eprint/26634/1/EGU2011-1723.pdf http://meetingorganizer.copernicus.org/EGU2011/EGU2011-1723.pdf |
geographic |
Laptev Sea |
geographic_facet |
Laptev Sea |
genre |
laptev Laptev Sea Sea ice |
genre_facet |
laptev Laptev Sea Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/26634/1/EGU2011-1723.pdf Willmes, S., Adams, S., Schröder, D. and Heinemann, G. (2011) Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between winters of 1979/80 and 2007/08. [Poster] In: EGU General Assembly 2011. , 03.04.-08.04.2011, Vienna, Austria . |
op_rights |
cc_by_nc |
_version_ |
1766062303485100032 |