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.
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.
Simple
Identification info
- Alternate title
- Gross Primary Production data collected from the K-Axis voyage of the Aurora Australis, 2016
- Date (Publication)
- 2021-08-31
- Edition
- 1
- Citation identifier
-
Dataset DOI
- Title
- Information and documentation - Digital object identifier system
- Date (Publication)
- 2012-04-23
- Citation identifier
- ISO 26324:2012
- Citation identifier
- doi:10.26179/5e4f6d873c078
Originator
Publisher
Principal investigator
Principal investigator
Principal investigator
Collaborator
- Name
- CAASM Metadata
- Other citation details
- Unreleased data
- Status
- Completed
Custodian
- Topic category
-
- Oceans
- Biota
Extent
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 2016-01-18 2016-02-16
- Title
- Guide to Best Practices for Ocean CO2 Measurements.
- Date (Publication)
- 2007
Author
- Name
- PICES Special Publication
- Page
- 191
- Title
- Primary productivity off the Antarctic coast from 30° to 80° E; BROKE-West survey, 2006.
- Date (Publication)
- 2010
- Citation identifier
- 57
Author
- Name
- Deep-Sea Research II
- Page
- 794-814
- Title
- Phytoplankton community structure and stocks in the Southern Ocean (30°-80°E) determined by CHEMTAX analysis of HPLC pigment signatures.
- Date (Publication)
- 2010
- Citation identifier
- 57
Author
- Name
- Deep Sea Research II
- Page
- 758-778
- NASA/GCMD Earth Science Keywords
-
- EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
- EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION
- Keywords
-
- GROSS PRIMARY PRODUCTION
- NASA/GCMD Earth Science Keywords
-
- CTD > Conductivity Temperature Depth
- LBLSC > Low Background Liquid Scintillation Counter
- NASA/GCMD Earth Science Keywords
-
- R/V AA > R/V Aurora Australis
- NASA/GCMD Earth Science Keywords
-
- AMD/AU
- ACE/CRC
- AMD
- CEOS
- NASA/GCMD Earth Science Keywords
-
- GEOGRAPHIC REGION > POLAR
- OCEAN > SOUTHERN OCEAN > KERGUELEN PLATEAU
- OCEAN > SOUTHERN OCEAN > BANZARE BANK
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- Attribution 4.0 International (CC BY 4.0)
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https://creativecommons.org/licenses/by/4.0/legalcode
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- This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4344_Gross_Primary_Production when using these data.
- Language
- English
- Character encoding
- UTF8
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- Free
- Planned available datetime
- 2021-08-31T00:00:00
- Units of distribution
- kb
- Transfer size
- 637
- Distribution format
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- Excel
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- Maintenance and update frequency
- As needed
- Maintenance note
- 2020-02-21 - record created by Karen Westwood.
Metadata
- Metadata identifier
- string/AAS_4344_Gross_Primary_Production
- Language
- English
- Character encoding
- UTF8
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- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 2c20ac8b-5ff0-47c1-a46e-a5c565e6160f
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2020-02-21T16:35:11
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- Description
- metadata.extraction_date
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 8.6
- Metadata linkage
-
http://data.aad.gov.au/metadata/records/AAS_4344_Gross_Primary_Production
Point of truth for the metadata record
- Date info (Creation)
- 2020-02-21T00:00:00
- Date info (Last Update)
- 2020-02-21
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile