On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait
The Western Basin (WB) of the Bransfield Strait has a complex water mass structure derived from a variety of sources, and is located next to the Antarctic region most affected by climate change. The WB is one of the three Bransfield Strait deep basins and the one most directly influenced by the wate...
Language: | unknown |
---|---|
Published: |
2018
|
Subjects: | |
Online Access: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v149_n_p31_RuizBarlett https://hdl.handle.net/20.500.12110/paper_09670645_v149_n_p31_RuizBarlett |
id |
ftunibueairesbd:paper:paper_09670645_v149_n_p31_RuizBarlett |
---|---|
record_format |
openpolar |
spelling |
ftunibueairesbd:paper:paper_09670645_v149_n_p31_RuizBarlett 2023-05-15T13:51:24+02:00 On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v149_n_p31_RuizBarlett https://hdl.handle.net/20.500.12110/paper_09670645_v149_n_p31_RuizBarlett unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v149_n_p31_RuizBarlett http://hdl.handle.net/20.500.12110/paper_09670645_v149_n_p31_RuizBarlett Bransfield Strait ENSO Interannual variability Modified Circumpolar Deep Water (mCDW) SAM Warming Water masses Western Basin Hydrographic surveys Lanthanum Oceanography Modified circumpolar deep waters Water mass Western basins Climate change air-sea interaction annual variation deep water El Nino El Nino-Southern Oscillation La Nina regional climate temporal variation thermohaline circulation Antarctica Bellingshausen Sea Drake Passage Mediterranean Sea South Shetland Islands Southern Ocean Weddell Sea 2018 ftunibueairesbd https://doi.org/20.500.12110/paper_09670645_v149_n_p31_RuizBarlett 2023-02-16T02:09:11Z The Western Basin (WB) of the Bransfield Strait has a complex water mass structure derived from a variety of sources, and is located next to the Antarctic region most affected by climate change. The WB is one of the three Bransfield Strait deep basins and the one most directly influenced by the waters from the Bellingshausen Sea and Drake Passage. The objective of this paper is to study the variability of the inflow of water masses to the WB and to detect the possible impact of regional climate change. We focus on the modified Circumpolar Deep Water (mCDW) that enters the WB through the northwestern passages. To achieve this goal, this study uses historical hydrographic data collected between 1960 and 2014. Warming (0.0161 ± 0.0079 °C yr−1) and lightening (−0.0023 ± 0.0010 kg m−3 yr−1) of the mCDW core (γn = 27.85–28.27 kg m−3) are observed in the WB between 1960 and 2013. The waters within the 27.85–28 kg m−3 γn range presented warming and salinization. Waters deeper than 500 m showed cooling and freshening between the 1960s and 1990s; however, warming and lightening are observed if 1981–2013 is considered. These trends appear to be associated with the positive SAM trend observed since the mid-20th century. Statistically significant negative correlations between θ S and γⁿ of the mCDW core with ENSO were found between 1980 and 2014. During La Niña phases, the mCDW core extended along the southern slope of the South Shetland Islands while during El Niño phases, it was present in patches or was totally absent. Since the 2000s, the mCDW core extends southward within the WB, possibly associated to positive SAM phases. Statistically significant negative correlations between θ and S of the WB deeper waters with ENSO and SAM were found. These waters were in general more saline and denser during negative ENSO and SAM phases. Positive SAM phases with La Niña events suggest the increase (decrease) of mCDW (Weddell Sea shelf waters) contribution to the deep WB during the 2000s. Thus, high interannual variability in the ... Other/Unknown Material Antarc* Antarctic Antarctica Bellingshausen Sea Bransfield Strait Drake Passage South Shetland Islands Southern Ocean Weddell Sea Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic Bellingshausen Sea Bransfield Strait Drake Passage South Shetland Islands Southern Ocean The Antarctic Weddell Weddell Sea Western Basin |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Bransfield Strait ENSO Interannual variability Modified Circumpolar Deep Water (mCDW) SAM Warming Water masses Western Basin Hydrographic surveys Lanthanum Oceanography Modified circumpolar deep waters Water mass Western basins Climate change air-sea interaction annual variation deep water El Nino El Nino-Southern Oscillation La Nina regional climate temporal variation thermohaline circulation Antarctica Bellingshausen Sea Drake Passage Mediterranean Sea South Shetland Islands Southern Ocean Weddell Sea |
spellingShingle |
Bransfield Strait ENSO Interannual variability Modified Circumpolar Deep Water (mCDW) SAM Warming Water masses Western Basin Hydrographic surveys Lanthanum Oceanography Modified circumpolar deep waters Water mass Western basins Climate change air-sea interaction annual variation deep water El Nino El Nino-Southern Oscillation La Nina regional climate temporal variation thermohaline circulation Antarctica Bellingshausen Sea Drake Passage Mediterranean Sea South Shetland Islands Southern Ocean Weddell Sea On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait |
topic_facet |
Bransfield Strait ENSO Interannual variability Modified Circumpolar Deep Water (mCDW) SAM Warming Water masses Western Basin Hydrographic surveys Lanthanum Oceanography Modified circumpolar deep waters Water mass Western basins Climate change air-sea interaction annual variation deep water El Nino El Nino-Southern Oscillation La Nina regional climate temporal variation thermohaline circulation Antarctica Bellingshausen Sea Drake Passage Mediterranean Sea South Shetland Islands Southern Ocean Weddell Sea |
description |
The Western Basin (WB) of the Bransfield Strait has a complex water mass structure derived from a variety of sources, and is located next to the Antarctic region most affected by climate change. The WB is one of the three Bransfield Strait deep basins and the one most directly influenced by the waters from the Bellingshausen Sea and Drake Passage. The objective of this paper is to study the variability of the inflow of water masses to the WB and to detect the possible impact of regional climate change. We focus on the modified Circumpolar Deep Water (mCDW) that enters the WB through the northwestern passages. To achieve this goal, this study uses historical hydrographic data collected between 1960 and 2014. Warming (0.0161 ± 0.0079 °C yr−1) and lightening (−0.0023 ± 0.0010 kg m−3 yr−1) of the mCDW core (γn = 27.85–28.27 kg m−3) are observed in the WB between 1960 and 2013. The waters within the 27.85–28 kg m−3 γn range presented warming and salinization. Waters deeper than 500 m showed cooling and freshening between the 1960s and 1990s; however, warming and lightening are observed if 1981–2013 is considered. These trends appear to be associated with the positive SAM trend observed since the mid-20th century. Statistically significant negative correlations between θ S and γⁿ of the mCDW core with ENSO were found between 1980 and 2014. During La Niña phases, the mCDW core extended along the southern slope of the South Shetland Islands while during El Niño phases, it was present in patches or was totally absent. Since the 2000s, the mCDW core extends southward within the WB, possibly associated to positive SAM phases. Statistically significant negative correlations between θ and S of the WB deeper waters with ENSO and SAM were found. These waters were in general more saline and denser during negative ENSO and SAM phases. Positive SAM phases with La Niña events suggest the increase (decrease) of mCDW (Weddell Sea shelf waters) contribution to the deep WB during the 2000s. Thus, high interannual variability in the ... |
title |
On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait |
title_short |
On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait |
title_full |
On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait |
title_fullStr |
On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait |
title_full_unstemmed |
On the temporal variability of intermediate and deep waters in the Western Basin of the Bransfield Strait |
title_sort |
on the temporal variability of intermediate and deep waters in the western basin of the bransfield strait |
publishDate |
2018 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v149_n_p31_RuizBarlett https://hdl.handle.net/20.500.12110/paper_09670645_v149_n_p31_RuizBarlett |
geographic |
Antarctic Bellingshausen Sea Bransfield Strait Drake Passage South Shetland Islands Southern Ocean The Antarctic Weddell Weddell Sea Western Basin |
geographic_facet |
Antarctic Bellingshausen Sea Bransfield Strait Drake Passage South Shetland Islands Southern Ocean The Antarctic Weddell Weddell Sea Western Basin |
genre |
Antarc* Antarctic Antarctica Bellingshausen Sea Bransfield Strait Drake Passage South Shetland Islands Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Bellingshausen Sea Bransfield Strait Drake Passage South Shetland Islands Southern Ocean Weddell Sea |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09670645_v149_n_p31_RuizBarlett http://hdl.handle.net/20.500.12110/paper_09670645_v149_n_p31_RuizBarlett |
op_doi |
https://doi.org/20.500.12110/paper_09670645_v149_n_p31_RuizBarlett |
_version_ |
1766255254857318400 |