Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin
Changes in properties and quantity of Antarctic Bottom Water (AABW) have major implications for the climate system, through sequestration of heat and carbon into, and ventilation of, the abyssal ocean. Yet, it remains one of the most difficult water masses to observe. An array of 12 Deep Argo floats...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://doi.org/10.1029/2021JC017935 http://ecite.utas.edu.au/148629 |
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ftunivtasecite:oai:ecite.utas.edu.au:148629 2023-05-15T13:42:40+02:00 Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin Foppert, A Rintoul, SR Purkey, SG Zilberman, N Kobayashi, T Sallee, J-B van Wijk, EM Wallace, LO 2021 https://doi.org/10.1029/2021JC017935 http://ecite.utas.edu.au/148629 en eng Wiley-Blackwell Publishing Inc. http://dx.doi.org/10.1029/2021JC017935 Foppert, A and Rintoul, SR and Purkey, SG and Zilberman, N and Kobayashi, T and Sallee, J-B and van Wijk, EM and Wallace, LO, Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin, JGR Oceans, 126, (12) Article e2021JC017935. ISSN 2169-9275 (2021) [Refereed Article] http://ecite.utas.edu.au/148629 Earth Sciences Oceanography Physical oceanography Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.1029/2021JC017935 2022-08-29T22:18:36Z Changes in properties and quantity of Antarctic Bottom Water (AABW) have major implications for the climate system, through sequestration of heat and carbon into, and ventilation of, the abyssal ocean. Yet, it remains one of the most difficult water masses to observe. An array of 12 Deep Argo floats, capable of profiling from the surface to the seafloor and under sea ice, provides a new perspective on AABW in the Australian-Antarctic Basin. Over 2years of data from the floats illuminate AABW properties with unprecedented detail, simultaneously sampling AABW at multiple locations, year-round, throughout the basin. Calibrating each float individually with nearby, quasi-simultaneous shipboard profiles ensures the highest quality salinity data, with estimated accuracy of 0.005 or better. Pathways of Ross Sea and Adlie Land Bottom Water (RSBW and ALBW), defined by their unique temperature and salinity characteristics, are mapped along the continental slope from their respective sources. The main pathway of RSBW, identified by its characteristic deep salinity maximum, is inferred to be inshore of the 3,700m isobath, where it cools and freshens westward along the slope before interacting with ALBW near 140E. A pulse of very cold and very fresh (nearly −0.6C, 34.82gkg −1 ) ALBW appears in February 2019, highlighting temporal variability on daily scales near its source. Deep Argo has greatly enhanced our view of AABW in the Australian-Antarctic Basin and will prove to be an essential tool for monitoring future changes in the deep ocean by drastically increasing observations in a cost-effective way. Article in Journal/Newspaper Antarc* Antarctic Ross Sea Sea ice eCite UTAS (University of Tasmania) Antarctic Ross Sea Australian Antarctic Basin ENVELOPE(120.000,120.000,-60.000,-60.000) Australian-Antarctic Basin ENVELOPE(134.115,134.115,-58.800,-58.800) Journal of Geophysical Research: Oceans 126 12 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Physical oceanography |
spellingShingle |
Earth Sciences Oceanography Physical oceanography Foppert, A Rintoul, SR Purkey, SG Zilberman, N Kobayashi, T Sallee, J-B van Wijk, EM Wallace, LO Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin |
topic_facet |
Earth Sciences Oceanography Physical oceanography |
description |
Changes in properties and quantity of Antarctic Bottom Water (AABW) have major implications for the climate system, through sequestration of heat and carbon into, and ventilation of, the abyssal ocean. Yet, it remains one of the most difficult water masses to observe. An array of 12 Deep Argo floats, capable of profiling from the surface to the seafloor and under sea ice, provides a new perspective on AABW in the Australian-Antarctic Basin. Over 2years of data from the floats illuminate AABW properties with unprecedented detail, simultaneously sampling AABW at multiple locations, year-round, throughout the basin. Calibrating each float individually with nearby, quasi-simultaneous shipboard profiles ensures the highest quality salinity data, with estimated accuracy of 0.005 or better. Pathways of Ross Sea and Adlie Land Bottom Water (RSBW and ALBW), defined by their unique temperature and salinity characteristics, are mapped along the continental slope from their respective sources. The main pathway of RSBW, identified by its characteristic deep salinity maximum, is inferred to be inshore of the 3,700m isobath, where it cools and freshens westward along the slope before interacting with ALBW near 140E. A pulse of very cold and very fresh (nearly −0.6C, 34.82gkg −1 ) ALBW appears in February 2019, highlighting temporal variability on daily scales near its source. Deep Argo has greatly enhanced our view of AABW in the Australian-Antarctic Basin and will prove to be an essential tool for monitoring future changes in the deep ocean by drastically increasing observations in a cost-effective way. |
format |
Article in Journal/Newspaper |
author |
Foppert, A Rintoul, SR Purkey, SG Zilberman, N Kobayashi, T Sallee, J-B van Wijk, EM Wallace, LO |
author_facet |
Foppert, A Rintoul, SR Purkey, SG Zilberman, N Kobayashi, T Sallee, J-B van Wijk, EM Wallace, LO |
author_sort |
Foppert, A |
title |
Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin |
title_short |
Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin |
title_full |
Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin |
title_fullStr |
Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin |
title_full_unstemmed |
Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin |
title_sort |
deep argo reveals bottom water properties and pathways in the australian-antarctic basin |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2021 |
url |
https://doi.org/10.1029/2021JC017935 http://ecite.utas.edu.au/148629 |
long_lat |
ENVELOPE(120.000,120.000,-60.000,-60.000) ENVELOPE(134.115,134.115,-58.800,-58.800) |
geographic |
Antarctic Ross Sea Australian Antarctic Basin Australian-Antarctic Basin |
geographic_facet |
Antarctic Ross Sea Australian Antarctic Basin Australian-Antarctic Basin |
genre |
Antarc* Antarctic Ross Sea Sea ice |
genre_facet |
Antarc* Antarctic Ross Sea Sea ice |
op_relation |
http://dx.doi.org/10.1029/2021JC017935 Foppert, A and Rintoul, SR and Purkey, SG and Zilberman, N and Kobayashi, T and Sallee, J-B and van Wijk, EM and Wallace, LO, Deep argo reveals bottom water properties and pathways in the Australian-Antarctic Basin, JGR Oceans, 126, (12) Article e2021JC017935. ISSN 2169-9275 (2021) [Refereed Article] http://ecite.utas.edu.au/148629 |
op_doi |
https://doi.org/10.1029/2021JC017935 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
12 |
_version_ |
1766171277904576512 |