Data

antFOCE (Antarctic Free Ocean Carbon Enrichment) Seawater Carbonate Chemistry collected at Casey Station in the 2014/2015 season.

Australian Antarctic Division
Stark, J. ; STARK, JONATHAN SEAN ; JOHNSTONE, GLENN JAMES
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://data.aad.gov.au/metadata/AAS_4127_antFOCE_SeawaterCarbonateChemistry&rft.title=antFOCE (Antarctic Free Ocean Carbon Enrichment) Seawater Carbonate Chemistry collected at Casey Station in the 2014/2015 season.&rft.identifier=http://data.aad.gov.au/metadata/AAS_4127_antFOCE_SeawaterCarbonateChemistry&rft.publisher=Australian Antarctic Data Centre&rft.description=Carbonate chemistry data for the antFOCE seawater samples. The download file contains an Excel spreadsheet with a number of worksheets detailing the samples collected from O'Brien Bay, Casey Station. The dataset includes information on oxygen levels, pH levels, temperature and salinity levels, as well as the concentrations of various elements (dissolved inorganic carbon, phosphate, nitrate, nitrite, silicate).Free-ocean CO2 enrichment (FOCE) experiments have been deployed in marine ecosystems to manipulate carbonate system conditions to those predicted in future oceans. We investigated whether the pH/carbonate chemistry of extremely cold polar waters can be manipulated in an ecologically relevant way, to represent conditions under future atmospheric CO2 levels, in an in-situ FOCE experiment in Antarctica. We examined spatial and temporal variation in local ambient carbonate chemistry at hourly intervals at two sites between December and February and compared these with experimental conditions. We successfully maintained a mean pH offset in acidified benthic chambers of -0.38 (plus or minus 0.07) from ambient for approximately 8 weeks. Local diel and seasonal fluctuations in ambient pH were duplicated in the FOCE system. Large temporal variability in acidified chambers resulted from system stoppages. The mean pH, Ωarag and fCO2 values in the acidified chambers were 7.688 plus or minus 0.079, 0.62 plus or minus 0.13 and 912 plus or minus 150 micro-atm respectively. Variation in ambient pH appeared to be mainly driven by salinity and biological production and ranged from 8.019 to 8.192 with significant spatio-temporal variation. This experiment demonstrates the utility of FOCE systems to create conditions expected in future oceans that represent ecologically relevant variation, even under polar conditions.Progress Code: completed&rft.creator=Stark, J. &rft.creator=STARK, JONATHAN SEAN &rft.creator=JOHNSTONE, GLENN JAMES &rft.date=2017&rft.coverage=westlimit=110.20386; southlimit=-66.63556; eastlimit=110.80811; northlimit=-66.12496&rft.coverage=westlimit=110.20386; southlimit=-66.63556; eastlimit=110.80811; northlimit=-66.12496&rft_rights=These data are publicly available for download from the provided URL.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=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_4127_antFOCE_SeawaterCarbonateChemistry when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=oceans&rft_subject=EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE&rft_subject=EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBONATE&rft_subject=EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > OCEAN ACIDIFICATION&rft_subject=CARBONATE CHEMSITRY&rft_subject=OCEAN ACIDIFICATION&rft_subject=PH METERS&rft_subject=FIELD SURVEYS&rft_subject=FIELD INVESTIGATION&rft_subject=FACE > Free Air CO2 Enrichment Program&rft_subject=AMD/AU&rft_subject=AMD&rft_subject=CEOS&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=CONTINENT > ANTARCTICA&rft.type=dataset&rft.language=English Access the data
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Attribution 4.0 International (CC BY 4.0)
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These data are publicly available for download from the provided URL.

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_4127_antFOCE_SeawaterCarbonateChemistry when using these data.

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Full description

Carbonate chemistry data for the antFOCE seawater samples.

The download file contains an Excel spreadsheet with a number of worksheets detailing the samples collected from O'Brien Bay, Casey Station. The dataset includes information on oxygen levels, pH levels, temperature and salinity levels, as well as the concentrations of various elements (dissolved inorganic carbon, phosphate, nitrate, nitrite, silicate).

Free-ocean CO2 enrichment (FOCE) experiments have been deployed in marine ecosystems to manipulate carbonate system conditions to those predicted in future oceans. We investigated whether the pH/carbonate chemistry of extremely cold polar waters can be manipulated in an ecologically relevant way, to represent conditions under future atmospheric CO2 levels, in an in-situ FOCE experiment in Antarctica. We examined spatial and temporal variation in local ambient carbonate chemistry at hourly intervals at two sites between December and February and compared these with experimental conditions. We successfully maintained a mean pH offset in acidified benthic chambers of -0.38 (plus or minus 0.07) from ambient for approximately 8 weeks. Local diel and seasonal fluctuations in ambient pH were duplicated in the FOCE system. Large temporal variability in acidified chambers resulted from system stoppages. The mean pH, Ωarag and fCO2 values in the acidified chambers were 7.688 plus or minus 0.079, 0.62 plus or minus 0.13 and 912 plus or minus 150 micro-atm respectively. Variation in ambient pH appeared to be mainly driven by salinity and biological production and ranged from 8.019 to 8.192 with significant spatio-temporal variation. This experiment demonstrates the utility of FOCE systems to create conditions expected in future oceans that represent ecologically relevant variation, even under polar conditions.

Lineage

Progress Code: completed

Data time period: 2014-12-15 to 2015-03-02

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110.80811,-66.12496 110.80811,-66.63556 110.20386,-66.63556 110.20386,-66.12496 110.80811,-66.12496

110.505985,-66.38026

text: westlimit=110.20386; southlimit=-66.63556; eastlimit=110.80811; northlimit=-66.12496

Subjects
AMD | AMD/AU | CARBONATE CHEMSITRY | CEOS | CONTINENT > ANTARCTICA | EARTH SCIENCE > CLIMATE INDICATORS > ATMOSPHERIC/OCEAN INDICATORS > OCEAN ACIDIFICATION | EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBON DIOXIDE | EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBONATE | FACE > Free Air CO2 Enrichment Program | FIELD INVESTIGATION | FIELD SURVEYS | GEOGRAPHIC REGION > POLAR | OCEAN > SOUTHERN OCEAN | OCEAN ACIDIFICATION | PH METERS | oceans |

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Other Information
Download the data (GET DATA > DIRECT DOWNLOAD)

url : https://data.aad.gov.au/eds/4572/download

Public information for AAS project AAS_4127 (PROJECT HOME PAGE)

url : https://projects.aad.gov.au/report_project_public.cfm?project_no=AAS_4127

Citation reference for this metadata record and dataset. (VIEW RELATED INFORMATION)

url : https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4127_antFOCE_SeawaterCarbonateChemistry

Identifiers
  • global : AAS_4127_antFOCE_SeawaterCarbonateChemistry