Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability
Landfast sea ice (fast ice) is an important though poorly understood component of the cryosphere on the Antarctic continental shelf, where it plays a key role in atmosphere-ocean-ice-sheet interaction and coupled ecological and biogeochemical processes. Here, we present a first in-depth baseline ana...
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ftcdlib:oai:escholarship.org:ark:/13030/qt4gb0869t 2023-11-05T03:35:58+01:00 Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability Fraser, Alexander D Massom, Robert A Handcock, Mark S Reid, Phillip Ohshima, Kay I Raphael, Marilyn N Cartwright, Jessica Klekociuk, Andrew R Wang, Zhaohui Porter-Smith, Richard 5061 - 5077 2021-01-01 https://escholarship.org/uc/item/4gb0869t unknown eScholarship, University of California qt4gb0869t https://escholarship.org/uc/item/4gb0869t public The Cryosphere, vol 15, iss 11 Earth Sciences Oceanography Physical Geography and Environmental Geoscience Life Below Water Meteorology & Atmospheric Sciences article 2021 ftcdlib 2023-10-09T18:04:31Z Landfast sea ice (fast ice) is an important though poorly understood component of the cryosphere on the Antarctic continental shelf, where it plays a key role in atmosphere-ocean-ice-sheet interaction and coupled ecological and biogeochemical processes. Here, we present a first in-depth baseline analysis of variability and change in circum-Antarctic fast-ice distribution (including its relationship to bathymetry), based on a new high-resolution satellite-derived time series for the period 2000 to 2018. This reveals (a) an overall trend of -882±824 km2 yr-1 (-0.19±0.18 % yr-1) and (b) eight distinct regions in terms of fast-ice coverage and modes of formation. Of these, four exhibit positive trends over the 18-year period and four negative. Positive trends are seen in East Antarctica and in the Bellingshausen Sea, with this region claiming the largest positive trend of +1198±359 km2 yr-1 (+1.10±0.35 % yr-1). The four negative trends predominantly occur in West Antarctica, with the largest negative trend of -1206±277 km2 yr-1 (-1.78±0.41 % yr-1) occurring in the Victoria and Oates Land region in the western Ross Sea. All trends are significant. This new baseline analysis represents a significant advance in our knowledge of the current state of both the global cryosphere and the complex Antarctic coastal system, which are vulnerable to climate variability and change. It will also inform a wide range of other studies. Article in Journal/Newspaper Antarc* Antarctic Antarctica Bellingshausen Sea East Antarctica Ice Sheet Oates Land Ross Sea Sea ice The Cryosphere West Antarctica University of California: eScholarship |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Oceanography Physical Geography and Environmental Geoscience Life Below Water Meteorology & Atmospheric Sciences |
spellingShingle |
Earth Sciences Oceanography Physical Geography and Environmental Geoscience Life Below Water Meteorology & Atmospheric Sciences Fraser, Alexander D Massom, Robert A Handcock, Mark S Reid, Phillip Ohshima, Kay I Raphael, Marilyn N Cartwright, Jessica Klekociuk, Andrew R Wang, Zhaohui Porter-Smith, Richard Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability |
topic_facet |
Earth Sciences Oceanography Physical Geography and Environmental Geoscience Life Below Water Meteorology & Atmospheric Sciences |
description |
Landfast sea ice (fast ice) is an important though poorly understood component of the cryosphere on the Antarctic continental shelf, where it plays a key role in atmosphere-ocean-ice-sheet interaction and coupled ecological and biogeochemical processes. Here, we present a first in-depth baseline analysis of variability and change in circum-Antarctic fast-ice distribution (including its relationship to bathymetry), based on a new high-resolution satellite-derived time series for the period 2000 to 2018. This reveals (a) an overall trend of -882±824 km2 yr-1 (-0.19±0.18 % yr-1) and (b) eight distinct regions in terms of fast-ice coverage and modes of formation. Of these, four exhibit positive trends over the 18-year period and four negative. Positive trends are seen in East Antarctica and in the Bellingshausen Sea, with this region claiming the largest positive trend of +1198±359 km2 yr-1 (+1.10±0.35 % yr-1). The four negative trends predominantly occur in West Antarctica, with the largest negative trend of -1206±277 km2 yr-1 (-1.78±0.41 % yr-1) occurring in the Victoria and Oates Land region in the western Ross Sea. All trends are significant. This new baseline analysis represents a significant advance in our knowledge of the current state of both the global cryosphere and the complex Antarctic coastal system, which are vulnerable to climate variability and change. It will also inform a wide range of other studies. |
format |
Article in Journal/Newspaper |
author |
Fraser, Alexander D Massom, Robert A Handcock, Mark S Reid, Phillip Ohshima, Kay I Raphael, Marilyn N Cartwright, Jessica Klekociuk, Andrew R Wang, Zhaohui Porter-Smith, Richard |
author_facet |
Fraser, Alexander D Massom, Robert A Handcock, Mark S Reid, Phillip Ohshima, Kay I Raphael, Marilyn N Cartwright, Jessica Klekociuk, Andrew R Wang, Zhaohui Porter-Smith, Richard |
author_sort |
Fraser, Alexander D |
title |
Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability |
title_short |
Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability |
title_full |
Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability |
title_fullStr |
Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability |
title_full_unstemmed |
Eighteen-year record of circum-Antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability |
title_sort |
eighteen-year record of circum-antarctic landfast-sea-ice distribution allows detailed baseline characterisation and reveals trends and variability |
publisher |
eScholarship, University of California |
publishDate |
2021 |
url |
https://escholarship.org/uc/item/4gb0869t |
op_coverage |
5061 - 5077 |
genre |
Antarc* Antarctic Antarctica Bellingshausen Sea East Antarctica Ice Sheet Oates Land Ross Sea Sea ice The Cryosphere West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Bellingshausen Sea East Antarctica Ice Sheet Oates Land Ross Sea Sea ice The Cryosphere West Antarctica |
op_source |
The Cryosphere, vol 15, iss 11 |
op_relation |
qt4gb0869t https://escholarship.org/uc/item/4gb0869t |
op_rights |
public |
_version_ |
1781690634010099712 |