Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016
Gross Primary Production Six depths were sampled per CTD station ranging from near-surface to 125 m. Sample depths were based on downward fluorescence profiles and two of six samples always included both near-surface (approximately 5-10 m) and the depth of the chlorophyll maximum where applicable. P...
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Australian Ocean Data Network
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Online Access: | https://researchdata.ands.org.au/gross-primary-production-australis-2016/1447082 https://data.aad.gov.au/metadata/records/AAS_4344_Gross_Primary_Production https://data.aad.gov.au/eds/5080/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_Gross_Primary_Production |
id |
ftands:oai:ands.org.au::1447082 |
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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 |
biota oceans PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON PRIMARY PRODUCTION ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS GROSS PRIMARY PRODUCTION CTD > Conductivity Temperature Depth LBLSC > Low Background Liquid Scintillation Counter R/V AA > R/V Aurora Australis AMD/AU ACE/CRC AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN > KERGUELEN PLATEAU BANZARE BANK |
spellingShingle |
biota oceans PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON PRIMARY PRODUCTION ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS GROSS PRIMARY PRODUCTION CTD > Conductivity Temperature Depth LBLSC > Low Background Liquid Scintillation Counter R/V AA > R/V Aurora Australis AMD/AU ACE/CRC AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN > KERGUELEN PLATEAU BANZARE BANK Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016 |
topic_facet |
biota oceans PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON PRIMARY PRODUCTION ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS GROSS PRIMARY PRODUCTION CTD > Conductivity Temperature Depth LBLSC > Low Background Liquid Scintillation Counter R/V AA > R/V Aurora Australis AMD/AU ACE/CRC AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN > KERGUELEN PLATEAU BANZARE BANK |
description |
Gross Primary Production Six depths were sampled per CTD station ranging from near-surface to 125 m. Sample depths were based on downward fluorescence profiles and two of six samples always included both near-surface (approximately 5-10 m) and the depth of the chlorophyll maximum where applicable. Photosynthetic rates were determined using radioactive NaH14CO3. Incubations were conducted according to the method of Westwood et al. (2011). Cells were incubated for 1 hour at 21 light intensities ranging from 0 to 1200 µmol m-2 s-1 (CT Blue filter centred on 435 nm). Carbon uptake rates were corrected for in situ chlorophyll a (chl a) concentrations (µg L-1) measured using high performance liquid chromatography (HPLC, Wright et al. 2010), and for total dissolved inorganic carbon availability, analysed according to Dickson et al. (2007). Photosynthesis-irradiance (P-I) relationships were then plotted in R and the equation of Platt et al. (1980) used to fit curves to data using robust least squares non-linear regression. Photosynthetic parameters determined included light-saturated photosynthetic rate [Pmax, mg C (mg chl a)-1 h-1], initial slope of the light-limited section of the P-I curve [α, mg C (mg chl a)-1 h-1 (µmol m-2 s-1)-1], light intensity at which carbon-uptake became maximal (calculated as Pmax/ α = Ek, µmol m-2 s-1), intercept of the P-I curve with the carbon uptake axis [c, mg C (mg chl a)-1 h-1] , and the rate of photoinhibition where applicable [β, mg C (mg chl a)-1 h-1 (µmol m-2 s-1)-1]. Gross primary production rates were modelled using R. Depth interval profiles (1 m) of chl a from the surface to 200 m were constructed through the conversion of up-cast fluorometry data measured at each CTD station. For conversions, pooled fluorometry burst data from all sites and depths was linearly regressed against in situ chl a determined using HPLC. Gross daily depth-integrated water-column production was then calculated using chl a depth profiles, photosynthetic parameters (Pmax, α , β, see above), incoming climatological PAR, vertical light attenuation (Kd), and mixed layer depth. Climatological PAR was based on spatially averaged (49 pixels, approx. 2 degrees) 8 day composite Aqua MODIS data (level 3, 2004-2017) obtained for Julian day 34. Summed incoming light intensities throughout the day equated to mean total PAR provided by Aqua MODIS. Kd for each station was calculated through robust linear regression of natural logarithm-transformed PAR data with depth. In cases where CTD stations were conducted at night, Kd was calculated from a linear relationship established between pooled chlorophyll a concentrations and Kd’s determined at CTD stations conducted during the day (Kd = -0.0421 chl a * -0.0476). Mixed layer depths were calculated as the depth where density (sigma) changed by 0.05 from a 10 m reference point. Gross primary production was calculated at 0.1 time steps throughout the day (10 points per hour) and summed. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016 |
title_short |
Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016 |
title_full |
Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016 |
title_fullStr |
Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016 |
title_full_unstemmed |
Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016 |
title_sort |
gross primary production data collected from the k-axis voyage of the aurora australis, 2016 |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.ands.org.au/gross-primary-production-australis-2016/1447082 https://data.aad.gov.au/metadata/records/AAS_4344_Gross_Primary_Production https://data.aad.gov.au/eds/5080/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_Gross_Primary_Production |
op_coverage |
Spatial: northlimit=-50; southlimit=-67.5; westlimit=55; eastLimit=95 Temporal: From 2016-01-18 to 2016-02-16 |
long_lat |
ENVELOPE(77.733,77.733,-58.833,-58.833) ENVELOPE(55,95,-50,-67.5) |
geographic |
Banzare Bank Kerguelen Southern Ocean |
geographic_facet |
Banzare Bank Kerguelen 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/gross-primary-production-australis-2016/1447082 2c20ac8b-5ff0-47c1-a46e-a5c565e6160f https://data.aad.gov.au/metadata/records/AAS_4344_Gross_Primary_Production https://data.aad.gov.au/eds/5080/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_Gross_Primary_Production |
_version_ |
1766364427478630400 |
spelling |
ftands:oai:ands.org.au::1447082 2023-05-15T15:33:49+02:00 Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016 AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-50; southlimit=-67.5; westlimit=55; eastLimit=95 Temporal: From 2016-01-18 to 2016-02-16 https://researchdata.ands.org.au/gross-primary-production-australis-2016/1447082 https://data.aad.gov.au/metadata/records/AAS_4344_Gross_Primary_Production https://data.aad.gov.au/eds/5080/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_Gross_Primary_Production unknown Australian Ocean Data Network https://researchdata.ands.org.au/gross-primary-production-australis-2016/1447082 2c20ac8b-5ff0-47c1-a46e-a5c565e6160f https://data.aad.gov.au/metadata/records/AAS_4344_Gross_Primary_Production https://data.aad.gov.au/eds/5080/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4344 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_Gross_Primary_Production https://data.aad.gov.au biota oceans PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON PRIMARY PRODUCTION ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS GROSS PRIMARY PRODUCTION CTD > Conductivity Temperature Depth LBLSC > Low Background Liquid Scintillation Counter R/V AA > R/V Aurora Australis AMD/AU ACE/CRC AMD CEOS GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN > KERGUELEN PLATEAU BANZARE BANK dataset ftands 2020-03-16T23:24:31Z Gross Primary Production Six depths were sampled per CTD station ranging from near-surface to 125 m. Sample depths were based on downward fluorescence profiles and two of six samples always included both near-surface (approximately 5-10 m) and the depth of the chlorophyll maximum where applicable. Photosynthetic rates were determined using radioactive NaH14CO3. Incubations were conducted according to the method of Westwood et al. (2011). Cells were incubated for 1 hour at 21 light intensities ranging from 0 to 1200 µmol m-2 s-1 (CT Blue filter centred on 435 nm). Carbon uptake rates were corrected for in situ chlorophyll a (chl a) concentrations (µg L-1) measured using high performance liquid chromatography (HPLC, Wright et al. 2010), and for total dissolved inorganic carbon availability, analysed according to Dickson et al. (2007). Photosynthesis-irradiance (P-I) relationships were then plotted in R and the equation of Platt et al. (1980) used to fit curves to data using robust least squares non-linear regression. Photosynthetic parameters determined included light-saturated photosynthetic rate [Pmax, mg C (mg chl a)-1 h-1], initial slope of the light-limited section of the P-I curve [α, mg C (mg chl a)-1 h-1 (µmol m-2 s-1)-1], light intensity at which carbon-uptake became maximal (calculated as Pmax/ α = Ek, µmol m-2 s-1), intercept of the P-I curve with the carbon uptake axis [c, mg C (mg chl a)-1 h-1] , and the rate of photoinhibition where applicable [β, mg C (mg chl a)-1 h-1 (µmol m-2 s-1)-1]. Gross primary production rates were modelled using R. Depth interval profiles (1 m) of chl a from the surface to 200 m were constructed through the conversion of up-cast fluorometry data measured at each CTD station. For conversions, pooled fluorometry burst data from all sites and depths was linearly regressed against in situ chl a determined using HPLC. Gross daily depth-integrated water-column production was then calculated using chl a depth profiles, photosynthetic parameters (Pmax, α , β, see above), incoming climatological PAR, vertical light attenuation (Kd), and mixed layer depth. Climatological PAR was based on spatially averaged (49 pixels, approx. 2 degrees) 8 day composite Aqua MODIS data (level 3, 2004-2017) obtained for Julian day 34. Summed incoming light intensities throughout the day equated to mean total PAR provided by Aqua MODIS. Kd for each station was calculated through robust linear regression of natural logarithm-transformed PAR data with depth. In cases where CTD stations were conducted at night, Kd was calculated from a linear relationship established between pooled chlorophyll a concentrations and Kd’s determined at CTD stations conducted during the day (Kd = -0.0421 chl a * -0.0476). Mixed layer depths were calculated as the depth where density (sigma) changed by 0.05 from a 10 m reference point. Gross primary production was calculated at 0.1 time steps throughout the day (10 points per hour) and summed. Dataset aurora australis Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Banzare Bank ENVELOPE(77.733,77.733,-58.833,-58.833) Kerguelen Southern Ocean ENVELOPE(55,95,-50,-67.5) |