Subantarctic zone oceanography - SAZ Project 1997-1998 - Arsenic Data
See the referenced papers for more information. Oceanographic processes in the subantarctic region contribute crucially to the physical and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Centre (CRC) organised the...
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Australian Ocean Data Network
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Online Access: | https://researchdata.ands.org.au/subantarctic-zone-oceanography-1998-arsenic/792778 https://data.aad.gov.au/metadata/records/ASAC_2256_Arsenic https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=2256 http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=3408 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2256_Arsenic |
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ftands:oai:ands.org.au::792778 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY Arsenic SAZ SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
spellingShingle |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY Arsenic 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 - Arsenic Data |
topic_facet |
oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY Arsenic SAZ SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
description |
See the referenced papers for more information. Oceanographic processes in the subantarctic region contribute crucially to the physical and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Centre (CRC) organised the SAZ Project, a multidisciplinary, multiship investigation carried out south of Australia in the austral summer of 1997-1998. Taken from the abstracts of the referenced papers: The development of a semi-automated batch HG-AFS method for the shipboard determination of As(III), As(V),MMA and DMA is described. Procedures in the analytical sequence including addition of NaBH4 to samples, cooling and heating the U-trap used for pre-concentration and separation of the arsines, and logging the AFS output are automated. Overall control of the automated tasks into a logical analytical sequence is achieved using a commercially available data acquisition and control package, workbenchmac(TM). Further modifications required for the method to be adapted to shipboard use, including the use of a hydrogen generator, are also detailed. This method shows a number of advantages over a previously reported manual HG-AFS method including, shorter sample throughput time, increased precision and most significantly, ease of use under shipboard conditions. The semi-automated method was operated on the RSV Aurora Australis during a Southern Ocean voyage in March 1998. Arsenic measurements from a surface transect between 42 and 55 degrees S along 141 degrees 30 minutes E, are presented. Application of the method to more routine laboratory use is also discussed. Distribution of the arsenic species total inorganic arsenic [As(V+III)], arsenite [As(III)], monomethyl arsenic(MMA), andd dimethyl arsenic (DMA) was studied in the Subantarctic Zone (SAZ) of the Southern Ocean, south of Australia, during the austral autumn (March 1998). As (V) was the dominant arsenic species in both vertical profiles and surface waters along the meridional transect 42-55 degrees S, 141 degrees 30' E. It was also the only species observed at depths greater than 600 m. Concentrations of the reduced arsenic species (As(III), MMA, and DMA) were low in these waters compared with other oceanic sites with similar concentrations of chlorophyl a. As(III) concentrations could not be reliably quantified at any sites (less than 0.04 nM). The greatest conversion of As(V) to "biological" species was found at the surface in the Subtropical Convergence Zone(2.5%) and decreased heading southward to 1% in the Polar Front (PF). While the decline in methyl arsenic concentrations was broadly associated with water temperature and measures of biological production, slightly different trends were found in the SAZ and PF. North of the Subantarctic Front (SAF), methyl arsenic concentrations were well correlated with water temperature, while south of the front, no such relation existed. In addition, the ratio DMA/MMA increased south of the SAF, associated with a change in the microalgal community composition. Low water temperature, phosphate replete conditions, and low biological productivity in the Southern Ocean all contribute to the concentrations of biologically produced arsenic species in this region being among the lowest reported for oceanic waters. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Arsenic Data |
title_short |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Arsenic Data |
title_full |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Arsenic Data |
title_fullStr |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Arsenic Data |
title_full_unstemmed |
Subantarctic zone oceanography - SAZ Project 1997-1998 - Arsenic Data |
title_sort |
subantarctic zone oceanography - saz project 1997-1998 - arsenic data |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.ands.org.au/subantarctic-zone-oceanography-1998-arsenic/792778 https://data.aad.gov.au/metadata/records/ASAC_2256_Arsenic https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=2256 http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=3408 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2256_Arsenic |
op_coverage |
Spatial: northlimit=-42.0; southlimit=-55.0; westlimit=141.5; eastLimit=141.5 Temporal: From 1998-03-01 to 1998-03-31 |
long_lat |
ENVELOPE(141.5,141.5,-42.0,-55.0) |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic aurora australis Southern Ocean |
genre_facet |
Antarc* Antarctic aurora australis Southern Ocean |
op_source |
https://data.aad.gov.au |
op_relation |
https://researchdata.ands.org.au/subantarctic-zone-oceanography-1998-arsenic/792778 8b1720cf-eec2-4598-881e-c3f8d2b3974d https://data.aad.gov.au/metadata/records/ASAC_2256_Arsenic https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=2256 http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=3408 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2256_Arsenic |
_version_ |
1766246143059034112 |
spelling |
ftands:oai:ands.org.au::792778 2023-05-15T13:47:00+02:00 Subantarctic zone oceanography - SAZ Project 1997-1998 - Arsenic Data AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-42.0; southlimit=-55.0; westlimit=141.5; eastLimit=141.5 Temporal: From 1998-03-01 to 1998-03-31 https://researchdata.ands.org.au/subantarctic-zone-oceanography-1998-arsenic/792778 https://data.aad.gov.au/metadata/records/ASAC_2256_Arsenic https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=2256 http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=3408 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2256_Arsenic unknown Australian Ocean Data Network https://researchdata.ands.org.au/subantarctic-zone-oceanography-1998-arsenic/792778 8b1720cf-eec2-4598-881e-c3f8d2b3974d https://data.aad.gov.au/metadata/records/ASAC_2256_Arsenic https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=2256 http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=3408 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2256_Arsenic https://data.aad.gov.au oceans NUTRIENTS EARTH SCIENCE OCEAN CHEMISTRY Arsenic SAZ SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD ACE/CRC OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR dataset ftands 2020-01-05T21:22:16Z See the referenced papers for more information. Oceanographic processes in the subantarctic region contribute crucially to the physical and biogeochemical aspects of the global climate system. To explore and quantify these contributions, the Antarctic Cooperative Research Centre (CRC) organised the SAZ Project, a multidisciplinary, multiship investigation carried out south of Australia in the austral summer of 1997-1998. Taken from the abstracts of the referenced papers: The development of a semi-automated batch HG-AFS method for the shipboard determination of As(III), As(V),MMA and DMA is described. Procedures in the analytical sequence including addition of NaBH4 to samples, cooling and heating the U-trap used for pre-concentration and separation of the arsines, and logging the AFS output are automated. Overall control of the automated tasks into a logical analytical sequence is achieved using a commercially available data acquisition and control package, workbenchmac(TM). Further modifications required for the method to be adapted to shipboard use, including the use of a hydrogen generator, are also detailed. This method shows a number of advantages over a previously reported manual HG-AFS method including, shorter sample throughput time, increased precision and most significantly, ease of use under shipboard conditions. The semi-automated method was operated on the RSV Aurora Australis during a Southern Ocean voyage in March 1998. Arsenic measurements from a surface transect between 42 and 55 degrees S along 141 degrees 30 minutes E, are presented. Application of the method to more routine laboratory use is also discussed. Distribution of the arsenic species total inorganic arsenic [As(V+III)], arsenite [As(III)], monomethyl arsenic(MMA), andd dimethyl arsenic (DMA) was studied in the Subantarctic Zone (SAZ) of the Southern Ocean, south of Australia, during the austral autumn (March 1998). As (V) was the dominant arsenic species in both vertical profiles and surface waters along the meridional transect 42-55 degrees S, 141 degrees 30' E. It was also the only species observed at depths greater than 600 m. Concentrations of the reduced arsenic species (As(III), MMA, and DMA) were low in these waters compared with other oceanic sites with similar concentrations of chlorophyl a. As(III) concentrations could not be reliably quantified at any sites (less than 0.04 nM). The greatest conversion of As(V) to "biological" species was found at the surface in the Subtropical Convergence Zone(2.5%) and decreased heading southward to 1% in the Polar Front (PF). While the decline in methyl arsenic concentrations was broadly associated with water temperature and measures of biological production, slightly different trends were found in the SAZ and PF. North of the Subantarctic Front (SAF), methyl arsenic concentrations were well correlated with water temperature, while south of the front, no such relation existed. In addition, the ratio DMA/MMA increased south of the SAF, associated with a change in the microalgal community composition. Low water temperature, phosphate replete conditions, and low biological productivity in the Southern Ocean all contribute to the concentrations of biologically produced arsenic species in this region being among the lowest reported for oceanic waters. Dataset Antarc* Antarctic aurora australis Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Antarctic Austral Southern Ocean The Antarctic ENVELOPE(141.5,141.5,-42.0,-55.0) |