The freshwater system west of the Antarctic Peninsula: spatial and temporal changes
Climate change west of the Antarctic Peninsula is the most rapid of anywhere in the Southern Hemisphere, with associated changes in the rates and distributions of freshwater inputs to the ocean. Here, results from the first comprehensive survey of oxygen isotopes in seawater in this region are used...
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American Meteorological Society
2013
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ftnerc:oai:nora.nerc.ac.uk:501487 2023-05-15T13:48:07+02:00 The freshwater system west of the Antarctic Peninsula: spatial and temporal changes Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ducklow, Hugh W. Erickson, Matthew Leng, Melanie J. Lenaerts, Jan T. M. van den Broeke, Michiel R. 2013-03 text http://nora.nerc.ac.uk/id/eprint/501487/ https://nora.nerc.ac.uk/id/eprint/501487/1/jcli-d-12-00246.1.pdf https://doi.org/10.1175/JCLI-D-12-00246.1 en eng American Meteorological Society https://nora.nerc.ac.uk/id/eprint/501487/1/jcli-d-12-00246.1.pdf Meredith, Michael P. orcid:0000-0002-7342-7756 Venables, Hugh J.; Clarke, Andrew orcid:0000-0002-7582-3074 Ducklow, Hugh W.; Erickson, Matthew; Leng, Melanie J. orcid:0000-0003-1115-5166 Lenaerts, Jan T. M.; van den Broeke, Michiel R. 2013 The freshwater system west of the Antarctic Peninsula: spatial and temporal changes. Journal of Climate, 26 (5). 1669-1684. https://doi.org/10.1175/JCLI-D-12-00246.1 <https://doi.org/10.1175/JCLI-D-12-00246.1> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.1175/JCLI-D-12-00246.1 2023-02-04T19:36:46Z Climate change west of the Antarctic Peninsula is the most rapid of anywhere in the Southern Hemisphere, with associated changes in the rates and distributions of freshwater inputs to the ocean. Here, results from the first comprehensive survey of oxygen isotopes in seawater in this region are used to quantify spatial patterns of meteoric water (glacial discharge and precipitation) separately from sea ice melt. High levels of meteoric water are found close to the coast, due to orographic effects on precipitation and strong glacial discharge. Concentrations decrease offshore, driving significant southward geostrophic flows (up to ~30 cm s−1). These produce high meteoric water concentrations at the southern end of the sampling grid, where collapse of the Wilkins Ice Shelf may also have contributed. Sea ice melt concentrations are lower than meteoric water and patchier because of the mobile nature of the sea ice itself. Nonetheless, net sea ice production in the northern part of the sampling grid is inferred; combined with net sea ice melt in the south, this indicates an overall southward ice motion. The survey is contextualized temporally using a decade-long series of isotope data from a coastal Antarctic Peninsula site. This shows a temporal decline in meteoric water in the upper ocean, contrary to expectations based on increasing precipitation and accelerating deglaciation. This is driven by the increasing occurrence of deeper winter mixed layers and has potential implications for concentrations of trace metals supplied to the euphotic zone by glacial discharge. As the regional freshwater system evolves, the continuing isotope monitoring described here will elucidate the ongoing impacts on climate and the ecosystem. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Shelf Sea ice Wilkins Ice Shelf Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Wilkins ENVELOPE(59.326,59.326,-67.248,-67.248) Wilkins Ice Shelf ENVELOPE(-72.500,-72.500,-70.416,-70.416) Journal of Climate 26 5 1669 1684 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Climate change west of the Antarctic Peninsula is the most rapid of anywhere in the Southern Hemisphere, with associated changes in the rates and distributions of freshwater inputs to the ocean. Here, results from the first comprehensive survey of oxygen isotopes in seawater in this region are used to quantify spatial patterns of meteoric water (glacial discharge and precipitation) separately from sea ice melt. High levels of meteoric water are found close to the coast, due to orographic effects on precipitation and strong glacial discharge. Concentrations decrease offshore, driving significant southward geostrophic flows (up to ~30 cm s−1). These produce high meteoric water concentrations at the southern end of the sampling grid, where collapse of the Wilkins Ice Shelf may also have contributed. Sea ice melt concentrations are lower than meteoric water and patchier because of the mobile nature of the sea ice itself. Nonetheless, net sea ice production in the northern part of the sampling grid is inferred; combined with net sea ice melt in the south, this indicates an overall southward ice motion. The survey is contextualized temporally using a decade-long series of isotope data from a coastal Antarctic Peninsula site. This shows a temporal decline in meteoric water in the upper ocean, contrary to expectations based on increasing precipitation and accelerating deglaciation. This is driven by the increasing occurrence of deeper winter mixed layers and has potential implications for concentrations of trace metals supplied to the euphotic zone by glacial discharge. As the regional freshwater system evolves, the continuing isotope monitoring described here will elucidate the ongoing impacts on climate and the ecosystem. |
format |
Article in Journal/Newspaper |
author |
Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ducklow, Hugh W. Erickson, Matthew Leng, Melanie J. Lenaerts, Jan T. M. van den Broeke, Michiel R. |
spellingShingle |
Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ducklow, Hugh W. Erickson, Matthew Leng, Melanie J. Lenaerts, Jan T. M. van den Broeke, Michiel R. The freshwater system west of the Antarctic Peninsula: spatial and temporal changes |
author_facet |
Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ducklow, Hugh W. Erickson, Matthew Leng, Melanie J. Lenaerts, Jan T. M. van den Broeke, Michiel R. |
author_sort |
Meredith, Michael P. |
title |
The freshwater system west of the Antarctic Peninsula: spatial and temporal changes |
title_short |
The freshwater system west of the Antarctic Peninsula: spatial and temporal changes |
title_full |
The freshwater system west of the Antarctic Peninsula: spatial and temporal changes |
title_fullStr |
The freshwater system west of the Antarctic Peninsula: spatial and temporal changes |
title_full_unstemmed |
The freshwater system west of the Antarctic Peninsula: spatial and temporal changes |
title_sort |
freshwater system west of the antarctic peninsula: spatial and temporal changes |
publisher |
American Meteorological Society |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/501487/ https://nora.nerc.ac.uk/id/eprint/501487/1/jcli-d-12-00246.1.pdf https://doi.org/10.1175/JCLI-D-12-00246.1 |
long_lat |
ENVELOPE(59.326,59.326,-67.248,-67.248) ENVELOPE(-72.500,-72.500,-70.416,-70.416) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Wilkins Wilkins Ice Shelf |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Wilkins Wilkins Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Shelf Sea ice Wilkins Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Shelf Sea ice Wilkins Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/501487/1/jcli-d-12-00246.1.pdf Meredith, Michael P. orcid:0000-0002-7342-7756 Venables, Hugh J.; Clarke, Andrew orcid:0000-0002-7582-3074 Ducklow, Hugh W.; Erickson, Matthew; Leng, Melanie J. orcid:0000-0003-1115-5166 Lenaerts, Jan T. M.; van den Broeke, Michiel R. 2013 The freshwater system west of the Antarctic Peninsula: spatial and temporal changes. Journal of Climate, 26 (5). 1669-1684. https://doi.org/10.1175/JCLI-D-12-00246.1 <https://doi.org/10.1175/JCLI-D-12-00246.1> |
op_doi |
https://doi.org/10.1175/JCLI-D-12-00246.1 |
container_title |
Journal of Climate |
container_volume |
26 |
container_issue |
5 |
container_start_page |
1669 |
op_container_end_page |
1684 |
_version_ |
1766248638409867264 |