Data

antFOCE Seawater Carbonate Chemistry collected at Casey Station in the 2014/2015 season.

Australian Antarctic Data Centre
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=info:doi10.4225/15/5a28b5eb04f71&rft.title=antFOCE Seawater Carbonate Chemistry collected at Casey Station in the 2014/2015 season.&rft.identifier=10.4225/15/5a28b5eb04f71&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.&rft.creator=STARK, JONATHAN SEAN &rft.creator=JOHNSTONE, GLENN JAMES &rft.date=2017&rft.coverage=northlimit=-66; southlimit=-67; westlimit=110; eastLimit=111; projection=WGS84&rft.coverage=northlimit=-66; southlimit=-67; westlimit=110; eastLimit=111; projection=WGS84&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_subject=oceans&rft_subject=CARBON DIOXIDE&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=OCEAN CHEMISTRY&rft_subject=CARBONATE&rft_subject=OCEAN ACIDIFICATION&rft_subject=CARBONATE CHEMSITRY&rft_subject=PH METERS&rft_subject=FIELD SURVEYS&rft_subject=FIELD INVESTIGATION&rft_subject=FACE > Free Air CO2 Enrichment Program&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=CONTINENT > ANTARCTICA&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data
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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_4127_antFOCE_SeawaterCarbonateChemistry when using these data.

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Brief 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.

Issued: 2017-12-07

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

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111,-66 111,-67 110,-67 110,-66 111,-66

110.5,-66.5

text: northlimit=-66; southlimit=-67; westlimit=110; eastLimit=111; projection=WGS84

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

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AU-ANL:PEAU : http://nla.gov.au/nla.party-617536

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