Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007
Progress Code: completed The Sub-Antarctic Zone (SAZ) in the Southern Ocean provides a significant sink for atmospheric CO2 and quantification of this sink is therefore important in models of climate change. During the SAZ-Sense (Sub-Antarctic Sensitivity to Environmental Change) survey conducted du...
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ftands:oai:ands.org.au::2817288 2023-10-09T21:46:46+02:00 Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007 Spatial: westlimit=140.6; southlimit=-54.1; eastlimit=153.3; northlimit=-43.5 Temporal: From 2007-01-19 to 2007-02-19 https://researchdata.edu.au/primary-production-sub-voyage-2007/2817288 unknown Australian Ocean Data Network https://researchdata.edu.au/primary-production-sub-voyage-2007/2817288 ASAC_40_SAZ-Sense_Primary_Production Dataset DOI AU/AADC > Australian Antarctic Data Centre, Australia oceans EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON SILICATE TRACE ELEMENTS OCEAN OPTICS > IRRADIANCE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION CHLOROPHYLL limiting factors iron CTD > Conductivity Temperature Depth INCUBATOR SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR dataset ftands 2023-09-18T22:43:01Z Progress Code: completed The Sub-Antarctic Zone (SAZ) in the Southern Ocean provides a significant sink for atmospheric CO2 and quantification of this sink is therefore important in models of climate change. During the SAZ-Sense (Sub-Antarctic Sensitivity to Environmental Change) survey conducted during austral summer 2007, we examined CO2 sequestration through measurement of gross primary production rates using 14C. Sampling was conducted in the SAZ to the south-west and south-east of Tasmania, and in the Polar Frontal Zone (PFZ) directly south of Tasmania. Despite higher chlorophyll biomass off the south-east of Tasmania, production measurements were similar to the south-west with rates of 986.2 plus or minus 500.4 and 1304.3 plus or minus 300.1 mg C m-2 d-1, respectively. Assimilation numbers suggested the onset of cell senescence by the time of sampling in the south-east, with healthy phytoplankton populations to the south-west sampled three week earlier. Production in the PFZ (475.4 plus or minus 168.7 mg C m-2 d-1) was lower than the SAZ, though not significantly. The PFZ was characterised by a defined deep chlorophyll maximum near the euphotic depth (75 m) with low production due to significant light limitation. A healthy and less light-limited phytoplankton population occupied the mixed layer of the PFZ, allowing more notable production there despite lower chlorophyll. A hypothesis that iron availability would enhance gross primary production in the SAZ was not supported due to the seasonal effect that masked possible responses. However, highest production (2572.5 mg C m-2 d-1) was measured nearby in the Sub-Tropical Zone off south-east Tasmania in a region where iron was likely to be non-limiting (Bowie et al., 2009). Table 1:Gross primary production at each CTD station and associated data; Mixed layer depth (Zm, m), incoming PAR (mol m-2 d-1), vertical light attenuation (Kd, m-1), euphotic depth (Zeu, m), differences between euphotic depth and mixed layer depth (Zeu-Zm, m), column-integrated ... Dataset Antarc* Antarctic aurora australis Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Antarctic Southern Ocean Austral |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
oceans EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON SILICATE TRACE ELEMENTS OCEAN OPTICS > IRRADIANCE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION CHLOROPHYLL limiting factors iron CTD > Conductivity Temperature Depth INCUBATOR SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
spellingShingle |
oceans EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON SILICATE TRACE ELEMENTS OCEAN OPTICS > IRRADIANCE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION CHLOROPHYLL limiting factors iron CTD > Conductivity Temperature Depth INCUBATOR SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007 |
topic_facet |
oceans EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON SILICATE TRACE ELEMENTS OCEAN OPTICS > IRRADIANCE BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION CHLOROPHYLL limiting factors iron CTD > Conductivity Temperature Depth INCUBATOR SHIPS R/V AA > R/V Aurora Australis AMD/AU CEOS AMD OCEAN > SOUTHERN OCEAN GEOGRAPHIC REGION > POLAR |
description |
Progress Code: completed The Sub-Antarctic Zone (SAZ) in the Southern Ocean provides a significant sink for atmospheric CO2 and quantification of this sink is therefore important in models of climate change. During the SAZ-Sense (Sub-Antarctic Sensitivity to Environmental Change) survey conducted during austral summer 2007, we examined CO2 sequestration through measurement of gross primary production rates using 14C. Sampling was conducted in the SAZ to the south-west and south-east of Tasmania, and in the Polar Frontal Zone (PFZ) directly south of Tasmania. Despite higher chlorophyll biomass off the south-east of Tasmania, production measurements were similar to the south-west with rates of 986.2 plus or minus 500.4 and 1304.3 plus or minus 300.1 mg C m-2 d-1, respectively. Assimilation numbers suggested the onset of cell senescence by the time of sampling in the south-east, with healthy phytoplankton populations to the south-west sampled three week earlier. Production in the PFZ (475.4 plus or minus 168.7 mg C m-2 d-1) was lower than the SAZ, though not significantly. The PFZ was characterised by a defined deep chlorophyll maximum near the euphotic depth (75 m) with low production due to significant light limitation. A healthy and less light-limited phytoplankton population occupied the mixed layer of the PFZ, allowing more notable production there despite lower chlorophyll. A hypothesis that iron availability would enhance gross primary production in the SAZ was not supported due to the seasonal effect that masked possible responses. However, highest production (2572.5 mg C m-2 d-1) was measured nearby in the Sub-Tropical Zone off south-east Tasmania in a region where iron was likely to be non-limiting (Bowie et al., 2009). Table 1:Gross primary production at each CTD station and associated data; Mixed layer depth (Zm, m), incoming PAR (mol m-2 d-1), vertical light attenuation (Kd, m-1), euphotic depth (Zeu, m), differences between euphotic depth and mixed layer depth (Zeu-Zm, m), column-integrated ... |
format |
Dataset |
title |
Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007 |
title_short |
Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007 |
title_full |
Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007 |
title_fullStr |
Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007 |
title_full_unstemmed |
Primary Production in the Sub-Antarctic and Polar Frontal Zones; SAZ-Sense Voyage, 2007 |
title_sort |
primary production in the sub-antarctic and polar frontal zones; saz-sense voyage, 2007 |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/primary-production-sub-voyage-2007/2817288 |
op_coverage |
Spatial: westlimit=140.6; southlimit=-54.1; eastlimit=153.3; northlimit=-43.5 Temporal: From 2007-01-19 to 2007-02-19 |
geographic |
Antarctic Southern Ocean Austral |
geographic_facet |
Antarctic Southern Ocean Austral |
genre |
Antarc* Antarctic aurora australis Southern Ocean |
genre_facet |
Antarc* Antarctic aurora australis Southern Ocean |
op_source |
AU/AADC > Australian Antarctic Data Centre, Australia |
op_relation |
https://researchdata.edu.au/primary-production-sub-voyage-2007/2817288 ASAC_40_SAZ-Sense_Primary_Production Dataset DOI |
_version_ |
1779309297259249664 |