Glacial meltwater identification in the Amundsen Sea

Pine Island Ice Shelf, in the Amundsen Sea, is losing mass because of warm ocean waters melting the ice from below. Tracing meltwater pathways from ice shelves is important for identifying the regions most affected by the increased input of this water type. Here, optimum multiparameter analysis is u...

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Published in:Journal of Physical Oceanography
Main Authors: Biddle, Louise C., Heywood, Karen J., Kaiser, Jan, Jenkins, Adrian
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
Online Access:https://ueaeprints.uea.ac.uk/id/eprint/63367/
https://ueaeprints.uea.ac.uk/id/eprint/63367/1/Published_manuscript.pdf
https://doi.org/10.1175/JPO-D-16-0221.1
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spelling ftuniveastangl:oai:ueaeprints.uea.ac.uk:63367 2023-05-15T13:23:37+02:00 Glacial meltwater identification in the Amundsen Sea Biddle, Louise C. Heywood, Karen J. Kaiser, Jan Jenkins, Adrian 2017-04-20 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/63367/ https://ueaeprints.uea.ac.uk/id/eprint/63367/1/Published_manuscript.pdf https://doi.org/10.1175/JPO-D-16-0221.1 en eng https://ueaeprints.uea.ac.uk/id/eprint/63367/1/Published_manuscript.pdf Biddle, Louise C., Heywood, Karen J., Kaiser, Jan and Jenkins, Adrian (2017) Glacial meltwater identification in the Amundsen Sea. Journal of Physical Oceanography, 47. pp. 933-954. ISSN 0022-3670 doi:10.1175/JPO-D-16-0221.1 cc_by Article PeerReviewed 2017 ftuniveastangl https://doi.org/10.1175/JPO-D-16-0221.1 2023-03-23T23:32:19Z Pine Island Ice Shelf, in the Amundsen Sea, is losing mass because of warm ocean waters melting the ice from below. Tracing meltwater pathways from ice shelves is important for identifying the regions most affected by the increased input of this water type. Here, optimum multiparameter analysis is used to deduce glacial meltwater fractions from water mass characteristics (temperature, salinity, and dissolved oxygen concentrations), collected during a ship-based campaign in the eastern Amundsen Sea in February–March 2014. Using a one-dimensional ocean model, processes such as variability in the characteristics of the source water masses on shelf and biological productivity/respiration are shown to affect the calculated apparent meltwater fractions. These processes can result in a false meltwater signature, creating misleading apparent glacial meltwater pathways. An alternative glacial meltwater calculation is suggested, using a pseudo–Circumpolar Deep Water endpoint and using an artificial increase in uncertainty of the dissolved oxygen measurements. The pseudo–Circumpolar Deep Water characteristics are affected by the under ice shelf bathymetry. The glacial meltwater fractions reveal a pathway for 2014 meltwater leading to the west of Pine Island Ice Shelf, along the coastline. Article in Journal/Newspaper Amundsen Sea Ice Shelf Ice Shelves University of East Anglia: UEA Digital Repository Amundsen Sea Journal of Physical Oceanography 47 4 933 954
institution Open Polar
collection University of East Anglia: UEA Digital Repository
op_collection_id ftuniveastangl
language English
description Pine Island Ice Shelf, in the Amundsen Sea, is losing mass because of warm ocean waters melting the ice from below. Tracing meltwater pathways from ice shelves is important for identifying the regions most affected by the increased input of this water type. Here, optimum multiparameter analysis is used to deduce glacial meltwater fractions from water mass characteristics (temperature, salinity, and dissolved oxygen concentrations), collected during a ship-based campaign in the eastern Amundsen Sea in February–March 2014. Using a one-dimensional ocean model, processes such as variability in the characteristics of the source water masses on shelf and biological productivity/respiration are shown to affect the calculated apparent meltwater fractions. These processes can result in a false meltwater signature, creating misleading apparent glacial meltwater pathways. An alternative glacial meltwater calculation is suggested, using a pseudo–Circumpolar Deep Water endpoint and using an artificial increase in uncertainty of the dissolved oxygen measurements. The pseudo–Circumpolar Deep Water characteristics are affected by the under ice shelf bathymetry. The glacial meltwater fractions reveal a pathway for 2014 meltwater leading to the west of Pine Island Ice Shelf, along the coastline.
format Article in Journal/Newspaper
author Biddle, Louise C.
Heywood, Karen J.
Kaiser, Jan
Jenkins, Adrian
spellingShingle Biddle, Louise C.
Heywood, Karen J.
Kaiser, Jan
Jenkins, Adrian
Glacial meltwater identification in the Amundsen Sea
author_facet Biddle, Louise C.
Heywood, Karen J.
Kaiser, Jan
Jenkins, Adrian
author_sort Biddle, Louise C.
title Glacial meltwater identification in the Amundsen Sea
title_short Glacial meltwater identification in the Amundsen Sea
title_full Glacial meltwater identification in the Amundsen Sea
title_fullStr Glacial meltwater identification in the Amundsen Sea
title_full_unstemmed Glacial meltwater identification in the Amundsen Sea
title_sort glacial meltwater identification in the amundsen sea
publishDate 2017
url https://ueaeprints.uea.ac.uk/id/eprint/63367/
https://ueaeprints.uea.ac.uk/id/eprint/63367/1/Published_manuscript.pdf
https://doi.org/10.1175/JPO-D-16-0221.1
geographic Amundsen Sea
geographic_facet Amundsen Sea
genre Amundsen Sea
Ice Shelf
Ice Shelves
genre_facet Amundsen Sea
Ice Shelf
Ice Shelves
op_relation https://ueaeprints.uea.ac.uk/id/eprint/63367/1/Published_manuscript.pdf
Biddle, Louise C., Heywood, Karen J., Kaiser, Jan and Jenkins, Adrian (2017) Glacial meltwater identification in the Amundsen Sea. Journal of Physical Oceanography, 47. pp. 933-954. ISSN 0022-3670
doi:10.1175/JPO-D-16-0221.1
op_rights cc_by
op_doi https://doi.org/10.1175/JPO-D-16-0221.1
container_title Journal of Physical Oceanography
container_volume 47
container_issue 4
container_start_page 933
op_container_end_page 954
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