Data

Quantifying the isotopic composition of oxygen and carbon through time in the core MD002361, located on the shelf edge offshore Western Australia

Australian Ocean Data Network
Spooner, Michelle ; De Deckker, Patrick
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/cbf81c20-07f1-11dc-92a7-00188b4c0af8&rft.title=Quantifying the isotopic composition of oxygen and carbon through time in the core MD002361, located on the shelf edge offshore Western Australia&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/cbf81c20-07f1-11dc-92a7-00188b4c0af8&rft.description=The calcareous tests of Globigerinoides ruber are analysed to quantify the isotopic composition of oxygen and carbon through time at core site MD002361 (113o28.63'E, 22o04.92'S). The heaviest 18O value was recorded during MIS 12 (at a depth of 1265cm) with a value of -0.04ppt, while the lightest 18O value of -2.49ppt was registered at 1200cm depth, during MIS 11. Once the estimated ice volume effect has been accounted for, this still leaves a substantial difference 18O which must be accounted for through significant changes in sea-surface temperature (SST) or salinity. The 13C record ranges from a minimum at approximately 126k yrs BP of -0.05ppt during MIS 5, to a maximum value of 2.11ppt during MIS 10.Maintenance and Update Frequency: notPlannedStatement: Sample collected using a piston core. Each sample was wet sieved through 63µm mesh. ~15 Gs. ruber were then picked from the bulk sample, approx. 250µm in size before being cleaned. Calculations of 13C and 18O at various depths were made by the Finnigan MAT 251 Mass Spectrometer at the Research School of Earth Sciences, Australian national University (ANU).Statement: Mass spectrometer was run concurrently with international standards NBS-19 and NBS-18, and has an analytical error of ±0.08 18O per mil. and ±0.05 13C per mil. None of the results have been amended to account for the ice volume effect on the foraminifera during the Last Glacial Maximum (LGM). Data was sampled every 4cm down the core to a depth of 295.5cm, at which point sampling was conducted every 5cm. This sampling continued down the core to 1360cm. There is some missing data for both 18O and 13C mainly around the 900-1100cm depth. For this region of the core, values for 18O and 13C have generally be calculated every 10cm. Parameters: Core depth (cm), oxygen-18 Gs.ruber (parts per thousand), carbon-13 Gs.ruber (parts per thousand).&rft.creator=Spooner, Michelle &rft.creator=De Deckker, Patrick &rft.date=2007&rft.coverage=113.48338,-22.09163 113.48516,-22.09177 113.48469,-22.09283 113.48360,-22.09270 113.48338,-22.09163&rft.coverage=westlimit=113; southlimit=-22.5; eastlimit=113.5; northlimit=-22&rft.coverage=westlimit=113; southlimit=-22.5; eastlimit=113.5; northlimit=-22&rft.coverage=uplimit=1805; downlimit=1805&rft.coverage=uplimit=1805; downlimit=1805&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au/&rft_rights=The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_subject=environment&rft_subject=ISOTOPES&rft_subject=EARTH SCIENCE&rft_subject=PALEOCLIMATE&rft_subject=OCEAN/LAKE RECORDS&rft_subject=core_depth&rft_subject=amount_of_oxygen-18_isotope_ga._bulloides&rft_subject=amount_of_carbon-13_isotope_ga._bulloides&rft.type=dataset&rft.language=English Access the data
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The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).

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Brief description

The calcareous tests of Globigerinoides ruber are analysed to quantify the isotopic composition of oxygen and carbon through time at core site MD002361 (113o28.63'E, 22o04.92'S). The heaviest 18O value was recorded during MIS 12 (at a depth of 1265cm) with a value of -0.04ppt, while the lightest 18O value of -2.49ppt was registered at 1200cm depth, during MIS 11. Once the estimated ice volume effect has been accounted for, this still leaves a substantial difference 18O which must be accounted for through significant changes in sea-surface temperature (SST) or salinity. The 13C record ranges from a minimum at approximately 126k yrs BP of -0.05ppt during MIS 5, to a maximum value of 2.11ppt during MIS 10.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: Sample collected using a piston core. Each sample was wet sieved through 63µm mesh. ~15 Gs. ruber were then picked from the bulk sample, approx. 250µm in size before being cleaned. Calculations of 13C and 18O at various depths were made by the Finnigan MAT 251 Mass Spectrometer at the Research School of Earth Sciences, Australian national University (ANU).
Statement: Mass spectrometer was run concurrently with international standards NBS-19 and NBS-18, and has an analytical error of ±0.08 18O per mil. and ±0.05 13C per mil. None of the results have been amended to account for the ice volume effect on the foraminifera during the Last Glacial Maximum (LGM). Data was sampled every 4cm down the core to a depth of 295.5cm, at which point sampling was conducted every 5cm. This sampling continued down the core to 1360cm. There is some missing data for both 18O and 13C mainly around the 900-1100cm depth. For this region of the core, values for 18O and 13C have generally be calculated every 10cm. Parameters: Core depth (cm), oxygen-18 Gs.ruber (parts per thousand), carbon-13 Gs.ruber (parts per thousand).

Notes

Credit
The Australian National University (ANU)
Credit
Funded by The National Oceans Office (NOO)
Credit
Funded by The Australian Research Council (ARC)
Credit
Funded by The French Polar Institute
Credit
Funded by The Australian Insitute of Nuclear Science Engineer (AINSE)
Credit
Funded by The Murray Darling Basin Commission
Purpose
The chemical composition of calcareous shell holds clues to the chemical and physical state of the ambient seawater and is useful in reconstructing properties of ancient marine environments.

Issued: 21 03 2007

Data time period: 2000-01-01 to 2000-01-01

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113.48338,-22.09163 113.48516,-22.09177 113.48469,-22.09283 113.4836,-22.0927 113.48338,-22.09163

113.48427,-22.09223

113.5,-22 113.5,-22.5 113,-22.5 113,-22 113.5,-22

113.25,-22.25

text: westlimit=113; southlimit=-22.5; eastlimit=113.5; northlimit=-22

text: uplimit=1805; downlimit=1805

Subjects
EARTH SCIENCE | Isotopes | OCEAN/LAKE RECORDS | PALEOCLIMATE | amount_of_carbon-13_isotope_ga._bulloides | amount_of_oxygen-18_isotope_ga._bulloides | core_depth | environment |

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Other Information
(ANU_Spooner_MD002361_1_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/cbf81c20-07f1-11dc-92a7-00188b4c0af8/attachments/ANU_Spooner_MD002361_1_data.xls

global : 85ccfd40-07f8-11dc-92a7-00188b4c0af8

Identifiers
  • global : cbf81c20-07f1-11dc-92a7-00188b4c0af8