Redox elements as indicators of biological processes in the Southern Ocean
Production of the arsenic species total inorganic arsenic [As(V+III)],arsenite [As(III)], monomethyl arsenic (MMA) and dimethyl arsenic (DMA) was studied in the Subantarctic Zone (SAZ) of the Southern Ocean, south of Australia, during the austral autumn (March 1998). Surface samples were collected a...
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Online Access: | https://researchdata.ands.org.au/redox-elements-indicators-southern-ocean/686004 https://data.aad.gov.au/metadata/records/ASAC_748 https://data.aad.gov.au/eds/1037/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=748 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_748 |
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ftands:oai:ands.org.au::686004 2023-05-15T15:33:50+02:00 Redox elements as indicators of biological processes in the Southern Ocean AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-42; southlimit=-55; westlimit=141.5; eastLimit=143 Temporal: From 1998-02-28 to 1998-04-01 https://researchdata.ands.org.au/redox-elements-indicators-southern-ocean/686004 https://data.aad.gov.au/metadata/records/ASAC_748 https://data.aad.gov.au/eds/1037/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=748 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_748 unknown Australian Ocean Data Network https://researchdata.ands.org.au/redox-elements-indicators-southern-ocean/686004 3a2898e0-5fb8-4a61-b7f9-65e9271d83e7 https://data.aad.gov.au/metadata/records/ASAC_748 https://data.aad.gov.au/eds/1037/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=748 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_748 https://data.aad.gov.au geoscientificInformation oceans BIOGEOCHEMICAL CYCLES EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS ARSENIC AU 97/06 SPECIATION SAZ CRUISE R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR dataset ftands 2020-01-05T21:06:52Z Production of the arsenic species total inorganic arsenic [As(V+III)],arsenite [As(III)], monomethyl arsenic (MMA) and dimethyl arsenic (DMA) was studied in the Subantarctic Zone (SAZ) of the Southern Ocean, south of Australia, during the austral autumn (March 1998). Surface samples were collected approximately every degree of latitude along the meridional transect 14130' E from 42 to 55 S. In addition, representative vertical profiles were collected at: 4206' S, 14153' E (Subtropical Convergence Zone - STCZ), 4643' S, 14159' E (Subantarctic Zone - SAZ), 5104' S, 14336' E (Subantarctic Front - SAF) and 5344' S, 14142' E (northern branch of the Polar Frontal Zone - PFZ). As(V) was the dominant arsenic species in both vertical profiles and surface waters along the transect. It was also the only species observed at depths greater than 600 m. Production of the reduced arsenic species (As(III), MMA, DMA) was low in these waters compared with other oceanic sites with similar concentrations of chlorophyll a. As(III) concentrations could not be reliably quantified at any sites (less than 0.04 nM). Greatest conversion of arsenic 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 production was broadly associated with water temperature and measures of biological production, slightly different trends in methyl arsenic production were found in the SAZ and PF. North of the Subantarctic Front (SAF) methyl arsenic production was well correlated with water temperature, while south of the front no such relation existed. In addition, the ratio of 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 SAZ all contribute to the concentrations of biologically produced arsenic species in this region being amongst the lowest reported for oceanic waters. The data are stored in an excel spreadsheet, and a readme text file. Dataset aurora australis Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Austral Southern Ocean ENVELOPE(141.5,143,-42,-55) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
geoscientificInformation oceans BIOGEOCHEMICAL CYCLES EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS ARSENIC AU 97/06 SPECIATION SAZ CRUISE R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
spellingShingle |
geoscientificInformation oceans BIOGEOCHEMICAL CYCLES EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS ARSENIC AU 97/06 SPECIATION SAZ CRUISE R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR Redox elements as indicators of biological processes in the Southern Ocean |
topic_facet |
geoscientificInformation oceans BIOGEOCHEMICAL CYCLES EARTH SCIENCE OCEAN CHEMISTRY TRACE ELEMENTS ARSENIC AU 97/06 SPECIATION SAZ CRUISE R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
description |
Production of the arsenic species total inorganic arsenic [As(V+III)],arsenite [As(III)], monomethyl arsenic (MMA) and dimethyl arsenic (DMA) was studied in the Subantarctic Zone (SAZ) of the Southern Ocean, south of Australia, during the austral autumn (March 1998). Surface samples were collected approximately every degree of latitude along the meridional transect 14130' E from 42 to 55 S. In addition, representative vertical profiles were collected at: 4206' S, 14153' E (Subtropical Convergence Zone - STCZ), 4643' S, 14159' E (Subantarctic Zone - SAZ), 5104' S, 14336' E (Subantarctic Front - SAF) and 5344' S, 14142' E (northern branch of the Polar Frontal Zone - PFZ). As(V) was the dominant arsenic species in both vertical profiles and surface waters along the transect. It was also the only species observed at depths greater than 600 m. Production of the reduced arsenic species (As(III), MMA, DMA) was low in these waters compared with other oceanic sites with similar concentrations of chlorophyll a. As(III) concentrations could not be reliably quantified at any sites (less than 0.04 nM). Greatest conversion of arsenic 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 production was broadly associated with water temperature and measures of biological production, slightly different trends in methyl arsenic production were found in the SAZ and PF. North of the Subantarctic Front (SAF) methyl arsenic production was well correlated with water temperature, while south of the front no such relation existed. In addition, the ratio of 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 SAZ all contribute to the concentrations of biologically produced arsenic species in this region being amongst the lowest reported for oceanic waters. The data are stored in an excel spreadsheet, and a readme text file. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
Redox elements as indicators of biological processes in the Southern Ocean |
title_short |
Redox elements as indicators of biological processes in the Southern Ocean |
title_full |
Redox elements as indicators of biological processes in the Southern Ocean |
title_fullStr |
Redox elements as indicators of biological processes in the Southern Ocean |
title_full_unstemmed |
Redox elements as indicators of biological processes in the Southern Ocean |
title_sort |
redox elements as indicators of biological processes in the southern ocean |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.ands.org.au/redox-elements-indicators-southern-ocean/686004 https://data.aad.gov.au/metadata/records/ASAC_748 https://data.aad.gov.au/eds/1037/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=748 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_748 |
op_coverage |
Spatial: northlimit=-42; southlimit=-55; westlimit=141.5; eastLimit=143 Temporal: From 1998-02-28 to 1998-04-01 |
long_lat |
ENVELOPE(141.5,143,-42,-55) |
geographic |
Austral Southern Ocean |
geographic_facet |
Austral Southern Ocean |
genre |
aurora australis Southern Ocean |
genre_facet |
aurora australis Southern Ocean |
op_source |
https://data.aad.gov.au |
op_relation |
https://researchdata.ands.org.au/redox-elements-indicators-southern-ocean/686004 3a2898e0-5fb8-4a61-b7f9-65e9271d83e7 https://data.aad.gov.au/metadata/records/ASAC_748 https://data.aad.gov.au/eds/1037/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=748 http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_748 |
_version_ |
1766364435639697408 |