Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula
The west Antarctic Peninsula (WAP) is a region of marked climatic variability, exhibiting strong changes in sea ice extent, retreat of most of its glaciers, and shifts in the amount and form of precipitation. These changes can have significant impacts on the oceanic freshwater budget and marine biog...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union
2021
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Online Access: | http://nora.nerc.ac.uk/id/eprint/529397/ https://nora.nerc.ac.uk/id/eprint/529397/1/2021JC017172.pdf https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2021JC017172 |
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ftnerc:oai:nora.nerc.ac.uk:529397 2023-05-15T13:41:45+02:00 Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula Meredith, Michael P. Stammerjohn, Sharon E. Ducklow, Hugh W. Leng, Melanie J. Arrowsmith, Carol Brearley, J. Alexander Venables, Hugh J. Barham, Mark Melchior van Wessem, Jan Schofield, Oscar Waite, Nicole 2021-06 text http://nora.nerc.ac.uk/id/eprint/529397/ https://nora.nerc.ac.uk/id/eprint/529397/1/2021JC017172.pdf https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2021JC017172 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/529397/1/2021JC017172.pdf Meredith, Michael P. orcid:0000-0002-7342-7756 Stammerjohn, Sharon E.; Ducklow, Hugh W.; Leng, Melanie J. orcid:0000-0003-1115-5166 Arrowsmith, Carol; Brearley, J. Alexander orcid:0000-0003-3700-8017 Venables, Hugh J.; Barham, Mark orcid:0000-0002-9724-2916 Melchior van Wessem, Jan; Schofield, Oscar; Waite, Nicole. 2021 Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula. Journal of Geophysical Research: Oceans, 126 (6), e2021JC017172. 22, pp. https://doi.org/10.1029/2021JC017172 <https://doi.org/10.1029/2021JC017172> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1029/2021JC017172 2023-02-04T19:51:38Z The west Antarctic Peninsula (WAP) is a region of marked climatic variability, exhibiting strong changes in sea ice extent, retreat of most of its glaciers, and shifts in the amount and form of precipitation. These changes can have significant impacts on the oceanic freshwater budget and marine biogeochemical processes; it is thus important to ascertain the relative balance of the drivers, and the spatial scales over which they operate. We present a novel 7‐year summer‐season (October to March; 2011 to 2018) series of oxygen isotopes in seawater (δ18O), augmented with some winter sampling, collected adjacent to Anvers Island at the WAP. These data are used to attribute oceanic freshwater changes to sea ice and meteoric sources, and to deduce information on the spatial scales over which the changes are driven. Sea ice melt shows significant seasonality (∼9% range) and marked interannual changes, with pronounced maxima in seasons 2013/14 and 2016/17. Both of these extrema are driven by anomalous winds, but reflect strongly contrasting dynamic and thermodynamic sea ice responses. Meteoric water also shows seasonality (∼7% range), with interannual variability reflecting changes in the input of accumulated precipitation and glacial melt to the ocean. Unlike sea ice melt, meteoric water extremes are especially pronounced in thin (<10 m) surface layers close to the proximate glacier, associated with enhanced ocean stratification. Isotopic tracers help to deconvolve the complex spatio‐temporal scales inherent in the coastal freshwater budget, and hence improve knowledge of the separate and cumulative physical and ecological impacts. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Anvers Island Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) Journal of Geophysical Research: Oceans 126 6 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The west Antarctic Peninsula (WAP) is a region of marked climatic variability, exhibiting strong changes in sea ice extent, retreat of most of its glaciers, and shifts in the amount and form of precipitation. These changes can have significant impacts on the oceanic freshwater budget and marine biogeochemical processes; it is thus important to ascertain the relative balance of the drivers, and the spatial scales over which they operate. We present a novel 7‐year summer‐season (October to March; 2011 to 2018) series of oxygen isotopes in seawater (δ18O), augmented with some winter sampling, collected adjacent to Anvers Island at the WAP. These data are used to attribute oceanic freshwater changes to sea ice and meteoric sources, and to deduce information on the spatial scales over which the changes are driven. Sea ice melt shows significant seasonality (∼9% range) and marked interannual changes, with pronounced maxima in seasons 2013/14 and 2016/17. Both of these extrema are driven by anomalous winds, but reflect strongly contrasting dynamic and thermodynamic sea ice responses. Meteoric water also shows seasonality (∼7% range), with interannual variability reflecting changes in the input of accumulated precipitation and glacial melt to the ocean. Unlike sea ice melt, meteoric water extremes are especially pronounced in thin (<10 m) surface layers close to the proximate glacier, associated with enhanced ocean stratification. Isotopic tracers help to deconvolve the complex spatio‐temporal scales inherent in the coastal freshwater budget, and hence improve knowledge of the separate and cumulative physical and ecological impacts. |
format |
Article in Journal/Newspaper |
author |
Meredith, Michael P. Stammerjohn, Sharon E. Ducklow, Hugh W. Leng, Melanie J. Arrowsmith, Carol Brearley, J. Alexander Venables, Hugh J. Barham, Mark Melchior van Wessem, Jan Schofield, Oscar Waite, Nicole |
spellingShingle |
Meredith, Michael P. Stammerjohn, Sharon E. Ducklow, Hugh W. Leng, Melanie J. Arrowsmith, Carol Brearley, J. Alexander Venables, Hugh J. Barham, Mark Melchior van Wessem, Jan Schofield, Oscar Waite, Nicole Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula |
author_facet |
Meredith, Michael P. Stammerjohn, Sharon E. Ducklow, Hugh W. Leng, Melanie J. Arrowsmith, Carol Brearley, J. Alexander Venables, Hugh J. Barham, Mark Melchior van Wessem, Jan Schofield, Oscar Waite, Nicole |
author_sort |
Meredith, Michael P. |
title |
Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula |
title_short |
Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula |
title_full |
Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula |
title_fullStr |
Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula |
title_full_unstemmed |
Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula |
title_sort |
local- and large-scale drivers of variability in the coastal freshwater budget of the western antarctic peninsula |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/529397/ https://nora.nerc.ac.uk/id/eprint/529397/1/2021JC017172.pdf https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2021JC017172 |
long_lat |
ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-63.500,-63.500,-64.600,-64.600) |
geographic |
Antarctic Antarctic Peninsula Anvers Anvers Island |
geographic_facet |
Antarctic Antarctic Peninsula Anvers Anvers Island |
genre |
Antarc* Antarctic Antarctic Peninsula Anvers Island Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Anvers Island Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/529397/1/2021JC017172.pdf Meredith, Michael P. orcid:0000-0002-7342-7756 Stammerjohn, Sharon E.; Ducklow, Hugh W.; Leng, Melanie J. orcid:0000-0003-1115-5166 Arrowsmith, Carol; Brearley, J. Alexander orcid:0000-0003-3700-8017 Venables, Hugh J.; Barham, Mark orcid:0000-0002-9724-2916 Melchior van Wessem, Jan; Schofield, Oscar; Waite, Nicole. 2021 Local- and large-scale drivers of variability in the coastal freshwater budget of the Western Antarctic Peninsula. Journal of Geophysical Research: Oceans, 126 (6), e2021JC017172. 22, pp. https://doi.org/10.1029/2021JC017172 <https://doi.org/10.1029/2021JC017172> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021JC017172 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
6 |
_version_ |
1766157222574817280 |