Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break
We use hydrological and current meter data collected in the Ross Sea, Antarctica between 1995 and 2006 to describe the spatial and temporal variability of water masses involved in the production of Antarctic Bottom Water (AABW). Data were collected in two regions of known outflows of dense shelf wat...
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ftunimessinairis:oai:iris.unime.it:11570/3299799 2024-06-23T07:46:43+00:00 Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break Budillon G. Castagno P. Aliani S. Spezie G. Padman L. Budillon, G. Castagno, P. Aliani, S. Spezie, G. Padman, L. 2011 ELETTRONICO https://hdl.handle.net/11570/3299799 https://doi.org/10.1016/j.dsr.2011.07.002 https://www.sciencedirect.com/science/article/pii/S0967063711001245?via=ihub eng eng PERGAMON-ELSEVIER SCIENCE LTD info:eu-repo/semantics/altIdentifier/wos/WOS:000295815500003 volume:58 issue:10 firstpage:1002 lastpage:1018 numberofpages:17 journal:DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS https://hdl.handle.net/11570/3299799 doi:10.1016/j.dsr.2011.07.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-80052088168 https://www.sciencedirect.com/science/article/pii/S0967063711001245?via=ihub AABW ASF Circulation HSSW Interannual variability ISW Ross Sea info:eu-repo/semantics/article 2011 ftunimessinairis https://doi.org/10.1016/j.dsr.2011.07.002 2024-06-10T23:38:54Z We use hydrological and current meter data collected in the Ross Sea, Antarctica between 1995 and 2006 to describe the spatial and temporal variability of water masses involved in the production of Antarctic Bottom Water (AABW). Data were collected in two regions of known outflows of dense shelf water in this region; the Drygalski Trough (DT) and the Glomar-Challenger Trough (GCT). Dense shelf water just inshore of the shelf break is dominated by High Salinity Shelf Water (HSSW) in the DT and Ice Shelf Water (ISW) in the GCT. The HSSW in the northern DT freshened by ~0.06 in 11. y, while the ISW in the northern GCT freshened by ~0.04 in 8. y and warmed by ~0.04 °C in 11. y, dominated by a rapid warming during austral summer 2001/02. The Antarctic Slope Front separating the warm Circumpolar Deep Water (CDW) from the shelf waters is more stable near GCT than near DT, with CDW and mixing products being found on the outer DT shelf but not on the outer GCT shelf. The different source waters and mixing processes at the two sites lead to production of AABW with different thermohaline characteristics in the central and western Ross Sea. Multi-year time series of hydrography and currents at long-term moorings within 100. km of the shelf break in both troughs confirm the interannual signals in the dense shelf water and reveal the seasonal cycle of water mass properties. Near the DT the HSSW salinities experienced maxima in March/April and minima in September/October. The ISW in the GCT is warmest in March/April and coolest between August and October. Mooring data also demonstrate significant high-frequency variability associated with tides and other processes. Wavelet analysis of near-bottom moored sensors sampling the dense water cascade over the continental slope west of the GCT shows intermittent energetic pulses of cold, dense water with periods from ~32. h to ~5 days. © 2011 Elsevier Ltd. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ross Sea Università degli Studi di Messina: IRIS Antarctic The Antarctic Austral Ross Sea Drygalski ENVELOPE(-61.000,-61.000,-64.717,-64.717) Deep Sea Research Part I: Oceanographic Research Papers 58 10 1002 1018 |
institution |
Open Polar |
collection |
Università degli Studi di Messina: IRIS |
op_collection_id |
ftunimessinairis |
language |
English |
topic |
AABW ASF Circulation HSSW Interannual variability ISW Ross Sea |
spellingShingle |
AABW ASF Circulation HSSW Interannual variability ISW Ross Sea Budillon G. Castagno P. Aliani S. Spezie G. Padman L. Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break |
topic_facet |
AABW ASF Circulation HSSW Interannual variability ISW Ross Sea |
description |
We use hydrological and current meter data collected in the Ross Sea, Antarctica between 1995 and 2006 to describe the spatial and temporal variability of water masses involved in the production of Antarctic Bottom Water (AABW). Data were collected in two regions of known outflows of dense shelf water in this region; the Drygalski Trough (DT) and the Glomar-Challenger Trough (GCT). Dense shelf water just inshore of the shelf break is dominated by High Salinity Shelf Water (HSSW) in the DT and Ice Shelf Water (ISW) in the GCT. The HSSW in the northern DT freshened by ~0.06 in 11. y, while the ISW in the northern GCT freshened by ~0.04 in 8. y and warmed by ~0.04 °C in 11. y, dominated by a rapid warming during austral summer 2001/02. The Antarctic Slope Front separating the warm Circumpolar Deep Water (CDW) from the shelf waters is more stable near GCT than near DT, with CDW and mixing products being found on the outer DT shelf but not on the outer GCT shelf. The different source waters and mixing processes at the two sites lead to production of AABW with different thermohaline characteristics in the central and western Ross Sea. Multi-year time series of hydrography and currents at long-term moorings within 100. km of the shelf break in both troughs confirm the interannual signals in the dense shelf water and reveal the seasonal cycle of water mass properties. Near the DT the HSSW salinities experienced maxima in March/April and minima in September/October. The ISW in the GCT is warmest in March/April and coolest between August and October. Mooring data also demonstrate significant high-frequency variability associated with tides and other processes. Wavelet analysis of near-bottom moored sensors sampling the dense water cascade over the continental slope west of the GCT shows intermittent energetic pulses of cold, dense water with periods from ~32. h to ~5 days. © 2011 Elsevier Ltd. |
author2 |
Budillon, G. Castagno, P. Aliani, S. Spezie, G. Padman, L. |
format |
Article in Journal/Newspaper |
author |
Budillon G. Castagno P. Aliani S. Spezie G. Padman L. |
author_facet |
Budillon G. Castagno P. Aliani S. Spezie G. Padman L. |
author_sort |
Budillon G. |
title |
Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break |
title_short |
Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break |
title_full |
Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break |
title_fullStr |
Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break |
title_full_unstemmed |
Thermohaline variability and Antarctic bottom water formation at the Ross Sea shelf break |
title_sort |
thermohaline variability and antarctic bottom water formation at the ross sea shelf break |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2011 |
url |
https://hdl.handle.net/11570/3299799 https://doi.org/10.1016/j.dsr.2011.07.002 https://www.sciencedirect.com/science/article/pii/S0967063711001245?via=ihub |
long_lat |
ENVELOPE(-61.000,-61.000,-64.717,-64.717) |
geographic |
Antarctic The Antarctic Austral Ross Sea Drygalski |
geographic_facet |
Antarctic The Antarctic Austral Ross Sea Drygalski |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ross Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000295815500003 volume:58 issue:10 firstpage:1002 lastpage:1018 numberofpages:17 journal:DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS https://hdl.handle.net/11570/3299799 doi:10.1016/j.dsr.2011.07.002 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-80052088168 https://www.sciencedirect.com/science/article/pii/S0967063711001245?via=ihub |
op_doi |
https://doi.org/10.1016/j.dsr.2011.07.002 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
58 |
container_issue |
10 |
container_start_page |
1002 |
op_container_end_page |
1018 |
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