Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years
The sea-ice thickness distribution is one of the most important sea-ice properties, but also one of the less frequently observed ones so far. Satellite retrievals of Antarctic sea-ice thickness are currently limited to laser and radar altimetry observations of snow freeboard with large uncertainties...
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ftawi:oai:epic.awi.de:35390 2023-05-15T13:40:26+02:00 Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years Schwegmann, Sandra Hunkeler, Priska Hendricks, Stefan Lemke, Peter Haas, Christian Krumpen, Thomas Ricker, Robert 2014-03-10 application/pdf https://epic.awi.de/id/eprint/35390/ https://epic.awi.de/id/eprint/35390/1/A721_20140310_SSchwegmann_16_10.pdf https://hdl.handle.net/10013/epic.43368 https://hdl.handle.net/10013/epic.43368.d001 unknown https://epic.awi.de/id/eprint/35390/1/A721_20140310_SSchwegmann_16_10.pdf https://hdl.handle.net/10013/epic.43368.d001 Schwegmann, S. , Hunkeler, P. , Hendricks, S. orcid:0000-0002-1412-3146 , Lemke, P. orcid:0000-0001-5739-3149 , Haas, C. , Krumpen, T. orcid:0000-0001-6234-8756 and Ricker, R. orcid:0000-0001-6928-7757 (2014) Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years , IGS International Symposium on Sea Ice in a Changing Environment, Hobart, Tasmania, Australia, 10 March 2014 - 14 March 2014 . hdl:10013/epic.43368 EPIC3IGS International Symposium on Sea Ice in a Changing Environment, Hobart, Tasmania, Australia, 2014-03-10-2014-03-14 Conference notRev 2014 ftawi 2021-12-24T15:39:29Z The sea-ice thickness distribution is one of the most important sea-ice properties, but also one of the less frequently observed ones so far. Satellite retrievals of Antarctic sea-ice thickness are currently limited to laser and radar altimetry observations of snow freeboard with large uncertainties, and electromagnetic measurements have been obtained only sporadically. For the investigation of the variability and changes in the sea-ice thickness distribution over the last decades, data are mainly available from very basic methods such as drilling or ship-based observations following the Antarctic Sea Ice Processes and Climate (ASPeCt) protocol. Thereby it is an advantage that those data also include information on the snow-depth and partly on the sea-ice freeboard distribution, which are as sparse as information on the sea-ice thickness distribution, in particular during winter conditions. The most recent data based on those methods were obtained during austral winter 2013, when various sea-ice parameters were measured in the Weddell Sea as part of the Antarctic Winter Ecosystem Climate Study (AWECS). Here, we present first results of the sea-ice thickness, freeboard and snow-depth distribution obtained by drill-hole measurements from this expedition. The new data set is compared with results from three previous winter campaigns done in 1989, 1992 and 2006 in the Weddell Sea in order to determine the long-term variability of sea-ice thickness, snow depth and freeboard. A challenge in comparing all those data is that measurement sites are based only on individual floes, which are expected to be representative for an entire region. In addition, sampling rates differ between the considered field experiments. Therefore, drill-hole thicknesses are cross-correlated with ground-based EM-measurements in order to identify for the newest data set, how representative the chosen study areas have been for the respective sea-ice floes and which consequences different measurement spacing has for the comparison of data from different years. Conference Object Antarc* Antarctic Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Austral The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The sea-ice thickness distribution is one of the most important sea-ice properties, but also one of the less frequently observed ones so far. Satellite retrievals of Antarctic sea-ice thickness are currently limited to laser and radar altimetry observations of snow freeboard with large uncertainties, and electromagnetic measurements have been obtained only sporadically. For the investigation of the variability and changes in the sea-ice thickness distribution over the last decades, data are mainly available from very basic methods such as drilling or ship-based observations following the Antarctic Sea Ice Processes and Climate (ASPeCt) protocol. Thereby it is an advantage that those data also include information on the snow-depth and partly on the sea-ice freeboard distribution, which are as sparse as information on the sea-ice thickness distribution, in particular during winter conditions. The most recent data based on those methods were obtained during austral winter 2013, when various sea-ice parameters were measured in the Weddell Sea as part of the Antarctic Winter Ecosystem Climate Study (AWECS). Here, we present first results of the sea-ice thickness, freeboard and snow-depth distribution obtained by drill-hole measurements from this expedition. The new data set is compared with results from three previous winter campaigns done in 1989, 1992 and 2006 in the Weddell Sea in order to determine the long-term variability of sea-ice thickness, snow depth and freeboard. A challenge in comparing all those data is that measurement sites are based only on individual floes, which are expected to be representative for an entire region. In addition, sampling rates differ between the considered field experiments. Therefore, drill-hole thicknesses are cross-correlated with ground-based EM-measurements in order to identify for the newest data set, how representative the chosen study areas have been for the respective sea-ice floes and which consequences different measurement spacing has for the comparison of data from different years. |
format |
Conference Object |
author |
Schwegmann, Sandra Hunkeler, Priska Hendricks, Stefan Lemke, Peter Haas, Christian Krumpen, Thomas Ricker, Robert |
spellingShingle |
Schwegmann, Sandra Hunkeler, Priska Hendricks, Stefan Lemke, Peter Haas, Christian Krumpen, Thomas Ricker, Robert Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years |
author_facet |
Schwegmann, Sandra Hunkeler, Priska Hendricks, Stefan Lemke, Peter Haas, Christian Krumpen, Thomas Ricker, Robert |
author_sort |
Schwegmann, Sandra |
title |
Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years |
title_short |
Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years |
title_full |
Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years |
title_fullStr |
Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years |
title_full_unstemmed |
Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years |
title_sort |
winter sea-ice thicknesses in the weddell sea and their variability over the past 24 years |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/35390/ https://epic.awi.de/id/eprint/35390/1/A721_20140310_SSchwegmann_16_10.pdf https://hdl.handle.net/10013/epic.43368 https://hdl.handle.net/10013/epic.43368.d001 |
geographic |
Antarctic Austral The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Austral The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Weddell Sea |
op_source |
EPIC3IGS International Symposium on Sea Ice in a Changing Environment, Hobart, Tasmania, Australia, 2014-03-10-2014-03-14 |
op_relation |
https://epic.awi.de/id/eprint/35390/1/A721_20140310_SSchwegmann_16_10.pdf https://hdl.handle.net/10013/epic.43368.d001 Schwegmann, S. , Hunkeler, P. , Hendricks, S. orcid:0000-0002-1412-3146 , Lemke, P. orcid:0000-0001-5739-3149 , Haas, C. , Krumpen, T. orcid:0000-0001-6234-8756 and Ricker, R. orcid:0000-0001-6928-7757 (2014) Winter sea-ice thicknesses in the Weddell Sea and their variability over the past 24 years , IGS International Symposium on Sea Ice in a Changing Environment, Hobart, Tasmania, Australia, 10 March 2014 - 14 March 2014 . hdl:10013/epic.43368 |
_version_ |
1766133953604878336 |