Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes
Highlights • Shifts in WSBW properties to less dense varieties likely equate to less formation of WSBW. • The decline of WSBW volume ceased around 2005 and likely recovering after that. • Dense Shelf Waters drive and modulate the recent WSBW variability. • WSBW is composed by 71% of mWDW and 29% of...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2018
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/44892/ https://oceanrep.geomar.de/id/eprint/44892/1/Kerr.pdf https://doi.org/10.1016/j.dsr2.2017.12.002 |
id |
ftoceanrep:oai:oceanrep.geomar.de:44892 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:44892 2023-05-15T13:37:49+02:00 Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes Kerr, Rodrigo Dotto, Tiago S. Mata, Mauricio M. Hellmer, Hartmut H. 2018 text https://oceanrep.geomar.de/id/eprint/44892/ https://oceanrep.geomar.de/id/eprint/44892/1/Kerr.pdf https://doi.org/10.1016/j.dsr2.2017.12.002 en eng Elsevier https://oceanrep.geomar.de/id/eprint/44892/1/Kerr.pdf Kerr, R., Dotto, T. S., Mata, M. M. and Hellmer, H. H. (2018) Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes. Deep Sea Research Part II: Topical Studies in Oceanography, 149 . pp. 70-83. DOI 10.1016/j.dsr2.2017.12.002 <https://doi.org/10.1016/j.dsr2.2017.12.002>. doi:10.1016/j.dsr2.2017.12.002 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2018 ftoceanrep https://doi.org/10.1016/j.dsr2.2017.12.002 2023-04-07T15:42:30Z Highlights • Shifts in WSBW properties to less dense varieties likely equate to less formation of WSBW. • The decline of WSBW volume ceased around 2005 and likely recovering after that. • Dense Shelf Waters drive and modulate the recent WSBW variability. • WSBW is composed by 71% of mWDW and 29% of Dense Shelf Waters. Abstract The role of Antarctic Bottom Water (AABW) in changing the ocean circulation and controlling climate variability is widely known. However, a comprehensive understanding of the relative contribution and variability of Antarctic regional deep water mass varieties that form AABW is still lacking. Using a high-quality dataset comprising three decades of observational shipboard surveys in the Weddell Sea (1984–2014), we updated the structure, composition and hydrographic properties variability of the Weddell Sea deep-layer, and quantified the contribution of the source waters composing Weddell Sea Bottom Water (WSBW) in its main formation zone. Shifts in WSBW hydrographic properties towards less dense varieties likely equate to less WSBW being produced over time. WSBW is primarily composed of 71 ± 4% of modified-Warm Deep Water (mWDW) and 29 ± 4% of Dense Shelf Waters, with the latter composed by ~ two-thirds (19 ± 2%) of High Salinity Shelf Water and ~ one-third (10 ± 6%) of Ice Shelf Water. Further, we show evidence that WSBW variability in the eastern Weddell Sea is driven by changes in the inflow of Dense Shelf Waters and bottom water from the Indian Sector of the Southern Ocean. This was observed through the rise of the WSBW contribution to the total mixture after 2005, following a twenty-year period (1984–2004) of decreasing contribution. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Indian Southern Ocean Weddell Weddell Sea Deep Sea Research Part II: Topical Studies in Oceanography 149 70 83 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Highlights • Shifts in WSBW properties to less dense varieties likely equate to less formation of WSBW. • The decline of WSBW volume ceased around 2005 and likely recovering after that. • Dense Shelf Waters drive and modulate the recent WSBW variability. • WSBW is composed by 71% of mWDW and 29% of Dense Shelf Waters. Abstract The role of Antarctic Bottom Water (AABW) in changing the ocean circulation and controlling climate variability is widely known. However, a comprehensive understanding of the relative contribution and variability of Antarctic regional deep water mass varieties that form AABW is still lacking. Using a high-quality dataset comprising three decades of observational shipboard surveys in the Weddell Sea (1984–2014), we updated the structure, composition and hydrographic properties variability of the Weddell Sea deep-layer, and quantified the contribution of the source waters composing Weddell Sea Bottom Water (WSBW) in its main formation zone. Shifts in WSBW hydrographic properties towards less dense varieties likely equate to less WSBW being produced over time. WSBW is primarily composed of 71 ± 4% of modified-Warm Deep Water (mWDW) and 29 ± 4% of Dense Shelf Waters, with the latter composed by ~ two-thirds (19 ± 2%) of High Salinity Shelf Water and ~ one-third (10 ± 6%) of Ice Shelf Water. Further, we show evidence that WSBW variability in the eastern Weddell Sea is driven by changes in the inflow of Dense Shelf Waters and bottom water from the Indian Sector of the Southern Ocean. This was observed through the rise of the WSBW contribution to the total mixture after 2005, following a twenty-year period (1984–2004) of decreasing contribution. |
format |
Article in Journal/Newspaper |
author |
Kerr, Rodrigo Dotto, Tiago S. Mata, Mauricio M. Hellmer, Hartmut H. |
spellingShingle |
Kerr, Rodrigo Dotto, Tiago S. Mata, Mauricio M. Hellmer, Hartmut H. Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes |
author_facet |
Kerr, Rodrigo Dotto, Tiago S. Mata, Mauricio M. Hellmer, Hartmut H. |
author_sort |
Kerr, Rodrigo |
title |
Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes |
title_short |
Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes |
title_full |
Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes |
title_fullStr |
Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes |
title_full_unstemmed |
Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes |
title_sort |
three decades of deep water mass investigation in the weddell sea (1984–2014): temporal variability and changes |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/44892/ https://oceanrep.geomar.de/id/eprint/44892/1/Kerr.pdf https://doi.org/10.1016/j.dsr2.2017.12.002 |
geographic |
Antarctic Indian Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Indian Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Southern Ocean Weddell Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/44892/1/Kerr.pdf Kerr, R., Dotto, T. S., Mata, M. M. and Hellmer, H. H. (2018) Three decades of deep water mass investigation in the Weddell Sea (1984–2014): Temporal variability and changes. Deep Sea Research Part II: Topical Studies in Oceanography, 149 . pp. 70-83. DOI 10.1016/j.dsr2.2017.12.002 <https://doi.org/10.1016/j.dsr2.2017.12.002>. doi:10.1016/j.dsr2.2017.12.002 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr2.2017.12.002 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
149 |
container_start_page |
70 |
op_container_end_page |
83 |
_version_ |
1766098012003631104 |