Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data
Progress Code: completed Statement: See the referenced papers for more information. The circumpolar Subantarctic Zone (SAZ) is a globally significant region of water mass formation and carbon dioxide uptake from the atmosphere. Here we synthesise the results of nine voyages over 8 years to describe...
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ftands:oai:ands.org.au::2822352 2024-09-15T17:56:43+00:00 Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data AADC (owner) AADC, DATA OFFICER (distributor) AADC, DATA OFFICER (custodian) AU/AADC > Australian Antarctic Data Centre, Australia (hasAssociationWith) Australian Antarctic Data Centre (publisher) Australian Antarctic Division (sponsor) CONNELL, DAVE J. (author) TRULL, THOMAS WILLIAM (collaborator) TRULL, THOMAS WILLIAM (hasPrincipalInvestigator) Spatial: westlimit=141.5; southlimit=-55.0; eastlimit=141.5; northlimit=-42.0 Spatial: uplimit=4000; downlimit=800 Temporal: From 1997-09-01 to 1998-03-31 https://researchdata.edu.au/subantarctic-zone-oceanography-oceanography-data/2822352 unknown Australian Ocean Data Network https://researchdata.edu.au/subantarctic-zone-oceanography-oceanography-data/2822352 ASAC_2256_Oceanography AU/AADC > Australian Antarctic Data Centre, Australia oceans EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN MIXED LAYER WATER MASSES OCEAN TEMPERATURE > SAZ SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR dataset ftands 2024-08-06T01:58:58Z Progress Code: completed Statement: See the referenced papers for more information. The circumpolar Subantarctic Zone (SAZ) is a globally significant region of water mass formation and carbon dioxide uptake from the atmosphere. Here we synthesise the results of nine voyages over 8 years to describe the seasonal variation in mixed layer properties in the SAZ south of Australia for comparison with biogeochemical process studies carried out in late summer (March 1998) as part of the SAZ Project. Winter mixing extends to depths greater than 400 m, resulting in the formation of Subantarctic Mode Water. In summer the mixed layer shoals to 75-100 m, depths which are still sufficiently deep that phytoplankton growth may be light limited. Nitrate and phosphate concentrations are reduced in summer( e.g., nitrate decreases from greater than 15 to less than 5/ micro mol kg- 1) but remain well above limiting levels. Silicate in contrast, is low throughout the year (4/micro mol kg- 1 in winter and less than 2 / micro mol kg- 1 in summer). Water mass properties along a north-south hydrographic section in March 1998 suggest that near-surface waters spread from south to north across the Subantarctic Front (SAF), supplying cool, fresh, nutrient-rich water to the SAZ. As a consequence, the properties of the southern SAZ differ from those farther north: the mixed layer in the south is cooler, fresher, deeper, higher in nutrients, and bounded below by a halocline (rather than by a seasonal thermocline, as in the northern SAZ). The contrast between the northern and southern SAZ persists throughout the year, suggesting the cross-front exchange occurs year-round and likely contributes to the differences in seasonal thermal amplitude and algal biomass accumulation seen in satellite images. Density-compensated horizontal gradients of temperature and salinity are common in the mixed layer of the SAZ and the northern SAF, consistent with the hypothesis that the vigour of lateral mixing in the mixed layer is a strong function of the ... Dataset aurora australis Southern Ocean Research Data Australia (Australian National Data Service - ANDS) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN MIXED LAYER WATER MASSES OCEAN TEMPERATURE > SAZ SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
spellingShingle |
oceans EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN MIXED LAYER WATER MASSES OCEAN TEMPERATURE > SAZ SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data |
topic_facet |
oceans EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN MIXED LAYER WATER MASSES OCEAN TEMPERATURE > SAZ SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
description |
Progress Code: completed Statement: See the referenced papers for more information. The circumpolar Subantarctic Zone (SAZ) is a globally significant region of water mass formation and carbon dioxide uptake from the atmosphere. Here we synthesise the results of nine voyages over 8 years to describe the seasonal variation in mixed layer properties in the SAZ south of Australia for comparison with biogeochemical process studies carried out in late summer (March 1998) as part of the SAZ Project. Winter mixing extends to depths greater than 400 m, resulting in the formation of Subantarctic Mode Water. In summer the mixed layer shoals to 75-100 m, depths which are still sufficiently deep that phytoplankton growth may be light limited. Nitrate and phosphate concentrations are reduced in summer( e.g., nitrate decreases from greater than 15 to less than 5/ micro mol kg- 1) but remain well above limiting levels. Silicate in contrast, is low throughout the year (4/micro mol kg- 1 in winter and less than 2 / micro mol kg- 1 in summer). Water mass properties along a north-south hydrographic section in March 1998 suggest that near-surface waters spread from south to north across the Subantarctic Front (SAF), supplying cool, fresh, nutrient-rich water to the SAZ. As a consequence, the properties of the southern SAZ differ from those farther north: the mixed layer in the south is cooler, fresher, deeper, higher in nutrients, and bounded below by a halocline (rather than by a seasonal thermocline, as in the northern SAZ). The contrast between the northern and southern SAZ persists throughout the year, suggesting the cross-front exchange occurs year-round and likely contributes to the differences in seasonal thermal amplitude and algal biomass accumulation seen in satellite images. Density-compensated horizontal gradients of temperature and salinity are common in the mixed layer of the SAZ and the northern SAF, consistent with the hypothesis that the vigour of lateral mixing in the mixed layer is a strong function of the ... |
author2 |
AADC (owner) AADC, DATA OFFICER (distributor) AADC, DATA OFFICER (custodian) AU/AADC > Australian Antarctic Data Centre, Australia (hasAssociationWith) Australian Antarctic Data Centre (publisher) Australian Antarctic Division (sponsor) CONNELL, DAVE J. (author) TRULL, THOMAS WILLIAM (collaborator) TRULL, THOMAS WILLIAM (hasPrincipalInvestigator) |
format |
Dataset |
title |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data |
title_short |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data |
title_full |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data |
title_fullStr |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data |
title_full_unstemmed |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Oceanography Data |
title_sort |
subantarctic zone oceanography - saz project 1997-1998 - oceanography data |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/subantarctic-zone-oceanography-oceanography-data/2822352 |
op_coverage |
Spatial: westlimit=141.5; southlimit=-55.0; eastlimit=141.5; northlimit=-42.0 Spatial: uplimit=4000; downlimit=800 Temporal: From 1997-09-01 to 1998-03-31 |
genre |
aurora australis Southern Ocean |
genre_facet |
aurora australis Southern Ocean |
op_source |
AU/AADC > Australian Antarctic Data Centre, Australia |
op_relation |
https://researchdata.edu.au/subantarctic-zone-oceanography-oceanography-data/2822352 ASAC_2256_Oceanography |
_version_ |
1810432926491344896 |