Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting
A 63-year observational record in the southwest Ross Sea shows a continuing, near-linear salinity decrease of 0.170 and slight warming of 0.013°C through 2020. That freshening exceeded any increase in sea ice production and brine release from stronger southerly winds, while melting and freezing at t...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/mz0v-ez57 2023-05-15T13:24:06+02:00 Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting Jacobs, Stanley Giulivi, Claudia Dutrieux, Pierre 2022 https://doi.org/10.7916/mz0v-ez57 English eng https://doi.org/10.7916/mz0v-ez57 Oceanography Ocean-atmosphere interaction Ice shelves Meltwater Salinity Articles 2022 ftcolumbiauniv https://doi.org/10.7916/mz0v-ez57 2022-05-07T22:19:54Z A 63-year observational record in the southwest Ross Sea shows a continuing, near-linear salinity decrease of 0.170 and slight warming of 0.013°C through 2020. That freshening exceeded any increase in sea ice production and brine release from stronger southerly winds, while melting and freezing at the Ross Ice Shelf base contributed little to the salinity change. The parallel seawater density decline appears not to have enhanced warm deep water intrusions onto the continental shelf (CS). Confirming prior inferences, the salinity change has been mainly caused by a growing imbalance in the meltwater available from thinning ice shelves and increased iceberg calving in the upstream Amundsen and Bellingshausen Seas. Shorter-term salinity variability has tracked winds near the Amundsen Sea CS break, in turn coherent with a broader Pacific climate variability index, and with salinity reversals on and seaward of the Ross CS. The melt driven freshening is positively correlated with global atmospheric CO2 and temperature increases, and adds to the rise in sea level from increased glacier flow into weakened ice shelves. Continued erosion of those ice shelves could end the production of high salinity shelf and bottom waters, as defined in the Ross Sea, by the 2050s. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf Ross Sea Sea ice Columbia University: Academic Commons Amundsen Sea Antarctic Pacific Ross Ice Shelf Ross Sea |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Oceanography Ocean-atmosphere interaction Ice shelves Meltwater Salinity |
spellingShingle |
Oceanography Ocean-atmosphere interaction Ice shelves Meltwater Salinity Jacobs, Stanley Giulivi, Claudia Dutrieux, Pierre Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting |
topic_facet |
Oceanography Ocean-atmosphere interaction Ice shelves Meltwater Salinity |
description |
A 63-year observational record in the southwest Ross Sea shows a continuing, near-linear salinity decrease of 0.170 and slight warming of 0.013°C through 2020. That freshening exceeded any increase in sea ice production and brine release from stronger southerly winds, while melting and freezing at the Ross Ice Shelf base contributed little to the salinity change. The parallel seawater density decline appears not to have enhanced warm deep water intrusions onto the continental shelf (CS). Confirming prior inferences, the salinity change has been mainly caused by a growing imbalance in the meltwater available from thinning ice shelves and increased iceberg calving in the upstream Amundsen and Bellingshausen Seas. Shorter-term salinity variability has tracked winds near the Amundsen Sea CS break, in turn coherent with a broader Pacific climate variability index, and with salinity reversals on and seaward of the Ross CS. The melt driven freshening is positively correlated with global atmospheric CO2 and temperature increases, and adds to the rise in sea level from increased glacier flow into weakened ice shelves. Continued erosion of those ice shelves could end the production of high salinity shelf and bottom waters, as defined in the Ross Sea, by the 2050s. |
format |
Article in Journal/Newspaper |
author |
Jacobs, Stanley Giulivi, Claudia Dutrieux, Pierre |
author_facet |
Jacobs, Stanley Giulivi, Claudia Dutrieux, Pierre |
author_sort |
Jacobs, Stanley |
title |
Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting |
title_short |
Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting |
title_full |
Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting |
title_fullStr |
Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting |
title_full_unstemmed |
Persistent Ross Sea Freshening from Imbalance West Antarctic Ice Shelf Melting |
title_sort |
persistent ross sea freshening from imbalance west antarctic ice shelf melting |
publishDate |
2022 |
url |
https://doi.org/10.7916/mz0v-ez57 |
geographic |
Amundsen Sea Antarctic Pacific Ross Ice Shelf Ross Sea |
geographic_facet |
Amundsen Sea Antarctic Pacific Ross Ice Shelf Ross Sea |
genre |
Amundsen Sea Antarc* Antarctic Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf Ross Sea Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf Ross Sea Sea ice |
op_relation |
https://doi.org/10.7916/mz0v-ez57 |
op_doi |
https://doi.org/10.7916/mz0v-ez57 |
_version_ |
1766377446998802432 |