Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica
During the second half of the twentieth century, the Antarctic Peninsula was subjected to a rapid increase in air temperatures. This was accompanied by a reduction in sea ice extent, increased precipitation and a dramatic retreat of glaciers associated with an increase in heat flux from deep ocean w...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2018
|
Subjects: | |
Online Access: | https://orca.cardiff.ac.uk/id/eprint/109008/ https://doi.org/10.1016/j.dsr.2018.01.005 https://orca.cardiff.ac.uk/id/eprint/109008/1/Sources%20variability%20and%20fate%20of%20freshwater%20in%20the%20Bellingshausen%20Sea%20Antarctica.pdf |
id |
ftunivcardiff:oai:https://orca.cardiff.ac.uk:109008 |
---|---|
record_format |
openpolar |
spelling |
ftunivcardiff:oai:https://orca.cardiff.ac.uk:109008 2023-12-17T10:20:26+01:00 Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica Regan, Heather C. Holland, Paul R. Meredith, Michael P. Pike, Jennifer 2018-03-31 application/pdf https://orca.cardiff.ac.uk/id/eprint/109008/ https://doi.org/10.1016/j.dsr.2018.01.005 https://orca.cardiff.ac.uk/id/eprint/109008/1/Sources%20variability%20and%20fate%20of%20freshwater%20in%20the%20Bellingshausen%20Sea%20Antarctica.pdf en eng Elsevier https://orca.cardiff.ac.uk/id/eprint/109008/1/Sources%20variability%20and%20fate%20of%20freshwater%20in%20the%20Bellingshausen%20Sea%20Antarctica.pdf Regan, Heather C., Holland, Paul R., Meredith, Michael P. and Pike, Jennifer https://orca.cardiff.ac.uk/view/cardiffauthors/A0179070.html orcid:0000-0001-9415-6003 orcid:0000-0001-9415-6003 2018. Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica. Deep Sea Research Part I: Oceanographic Research Papers 133 , pp. 59-71. 10.1016/j.dsr.2018.01.005 https://doi.org/10.1016/j.dsr.2018.01.005 file https://orca.cardiff.ac.uk/id/eprint/109008/1/Sources%20variability%20and%20fate%20of%20freshwater%20in%20the%20Bellingshausen%20Sea%20Antarctica.pdf doi:10.1016/j.dsr.2018.01.005 cc_by_nc_nd Article PeerReviewed 2018 ftunivcardiff https://doi.org/10.1016/j.dsr.2018.01.005 2023-11-23T23:33:39Z During the second half of the twentieth century, the Antarctic Peninsula was subjected to a rapid increase in air temperatures. This was accompanied by a reduction in sea ice extent, increased precipitation and a dramatic retreat of glaciers associated with an increase in heat flux from deep ocean water masses. Isotopic tracers have been used previously to investigate the relative importance of the different freshwater sources to the adjacent Bellingshausen Sea (BS), but the data coverage is strongly biased toward summer. Here we use a regional model to investigate the ocean's response to the observed changes in its different freshwater inputs (sea ice melt/freeze, precipitation, evaporation, iceberg/glacier melt, and ice shelf melt). The model successfully recreates BS water masses and performs well against available freshwater data. By tracing the sources and pathways of the individual components of the freshwater budget, we find that sea ice dominates seasonal changes in the total freshwater content and flux, but all sources make a comparable contribution to the annual-mean. Interannual variability is dominated by sea ice and precipitation. Decadal trends in the salinity and stratification of the ocean are investigated, and a 20-year surface freshening from 1992 to 2011 is found to be predominantly driven by decreasing autumn sea ice growth. These findings will help to elucidate the role of freshwater in driving circulation and water column structure changes in this climatically-sensitive region. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Shelf Iceberg* Sea ice Cardiff University: ORCA (Online Research @ Cardiff) Antarctic Antarctic Peninsula Bellingshausen Sea Iceberg Glacier ENVELOPE(-92.134,-92.134,79.517,79.517) The Antarctic Deep Sea Research Part I: Oceanographic Research Papers 133 59 71 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
description |
During the second half of the twentieth century, the Antarctic Peninsula was subjected to a rapid increase in air temperatures. This was accompanied by a reduction in sea ice extent, increased precipitation and a dramatic retreat of glaciers associated with an increase in heat flux from deep ocean water masses. Isotopic tracers have been used previously to investigate the relative importance of the different freshwater sources to the adjacent Bellingshausen Sea (BS), but the data coverage is strongly biased toward summer. Here we use a regional model to investigate the ocean's response to the observed changes in its different freshwater inputs (sea ice melt/freeze, precipitation, evaporation, iceberg/glacier melt, and ice shelf melt). The model successfully recreates BS water masses and performs well against available freshwater data. By tracing the sources and pathways of the individual components of the freshwater budget, we find that sea ice dominates seasonal changes in the total freshwater content and flux, but all sources make a comparable contribution to the annual-mean. Interannual variability is dominated by sea ice and precipitation. Decadal trends in the salinity and stratification of the ocean are investigated, and a 20-year surface freshening from 1992 to 2011 is found to be predominantly driven by decreasing autumn sea ice growth. These findings will help to elucidate the role of freshwater in driving circulation and water column structure changes in this climatically-sensitive region. |
format |
Article in Journal/Newspaper |
author |
Regan, Heather C. Holland, Paul R. Meredith, Michael P. Pike, Jennifer |
spellingShingle |
Regan, Heather C. Holland, Paul R. Meredith, Michael P. Pike, Jennifer Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica |
author_facet |
Regan, Heather C. Holland, Paul R. Meredith, Michael P. Pike, Jennifer |
author_sort |
Regan, Heather C. |
title |
Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica |
title_short |
Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica |
title_full |
Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica |
title_fullStr |
Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica |
title_full_unstemmed |
Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica |
title_sort |
sources, variability and fate of freshwater in the bellingshausen sea, antarctica |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://orca.cardiff.ac.uk/id/eprint/109008/ https://doi.org/10.1016/j.dsr.2018.01.005 https://orca.cardiff.ac.uk/id/eprint/109008/1/Sources%20variability%20and%20fate%20of%20freshwater%20in%20the%20Bellingshausen%20Sea%20Antarctica.pdf |
long_lat |
ENVELOPE(-92.134,-92.134,79.517,79.517) |
geographic |
Antarctic Antarctic Peninsula Bellingshausen Sea Iceberg Glacier The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Bellingshausen Sea Iceberg Glacier The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Shelf Iceberg* Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Ice Shelf Iceberg* Sea ice |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/109008/1/Sources%20variability%20and%20fate%20of%20freshwater%20in%20the%20Bellingshausen%20Sea%20Antarctica.pdf Regan, Heather C., Holland, Paul R., Meredith, Michael P. and Pike, Jennifer https://orca.cardiff.ac.uk/view/cardiffauthors/A0179070.html orcid:0000-0001-9415-6003 orcid:0000-0001-9415-6003 2018. Sources, variability and fate of freshwater in the Bellingshausen Sea, Antarctica. Deep Sea Research Part I: Oceanographic Research Papers 133 , pp. 59-71. 10.1016/j.dsr.2018.01.005 https://doi.org/10.1016/j.dsr.2018.01.005 file https://orca.cardiff.ac.uk/id/eprint/109008/1/Sources%20variability%20and%20fate%20of%20freshwater%20in%20the%20Bellingshausen%20Sea%20Antarctica.pdf doi:10.1016/j.dsr.2018.01.005 |
op_rights |
cc_by_nc_nd |
op_doi |
https://doi.org/10.1016/j.dsr.2018.01.005 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
133 |
container_start_page |
59 |
op_container_end_page |
71 |
_version_ |
1785591994115948544 |