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Swann, George E A; Kendrick, Christopher P; Dickson, Alexander J; Worne, Savannah (2018): Diatom carbon isotope data and CO2 reconstruction from ODP Site 145-882 through the late Pliocene. PANGAEA, https://doi.org/10.1594/PANGAEA.889751, Supplement to: Swann, GEA et al. (accepted): Late Pliocene marine pCO2 reconstructions from the Subarctic Pacific Ocean. Paleoceanography and Paleoclimatology, https://doi.org/10.1029/2017PA003296

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Abstract:
The development of large ice-sheets across the Northern Hemisphere during the late Pliocene and the emergence of the glacial-interglacial cycles that punctuate the Quaternary mark a significant threshold in Earth's climate history. Although a number of different mechanisms have been proposed to initiate this cooling and the onset of major Northern Hemisphere glaciation, reductions in atmospheric concentrations of CO2 likely played a key role. The emergence of a stratified (halocline) water column in the subarctic north-west Pacific Ocean at 2.73 Ma has often been interpreted as an event which would have limited oceanic ventilation of CO2 to the atmosphere, thereby helping to cool the global climate system. Here, diatom carbon isotopes (δ13Cdiatom) are used to reconstruct changes in regional carbon dynamics through this interval. Results show that the development of a salinity stratification did not fundamental alter the net oceanic/atmospheric flux of CO2 in the subarctic north-west Pacific Ocean through the late Pliocene/early Quaternary. These results provide further insights into the long-term controls on global carbon cycling and the role of the subarctic Pacific Ocean in instigating global climatic changes.
Project(s):
Coverage:
Median Latitude: 50.363300 * Median Longitude: 167.599800 * South-bound Latitude: 50.363300 * West-bound Longitude: 167.599600 * North-bound Latitude: 50.363300 * East-bound Longitude: 167.600000
Date/Time Start: 1992-07-08T10:30:00 * Date/Time End: 1992-08-08T17:30:00
Minimum Elevation: -3255.0 m * Maximum Elevation: -3255.0 m
Event(s):
145-882A * Latitude: 50.363300 * Longitude: 167.600000 * Date/Time Start: 1992-08-05T17:45:00 * Date/Time End: 1992-07-08T10:30:00 * Elevation: -3255.0 m * Penetration: 398.3 m * Recovery: 411.2 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 42 cores; 398.3 m cored; 0 m drilled; 103.2 % recovery
145-882B * Latitude: 50.363300 * Longitude: 167.599600 * Date/Time Start: 1992-08-07T10:30:00 * Date/Time End: 1992-08-08T17:30:00 * Elevation: -3255.0 m * Penetration: 270.4 m * Recovery: 280.9 m * Location: North Pacific Ocean * Campaign: Leg145 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 270.4 m cored; 0 m drilled; 103.9 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEventSwann, George E A
2Sample code/labelSample labelSwann, George E A
3AGEAgeka BPSwann, George E AGeocode
4δ13C, diatom-bound organic matterδ13C DB‰ PDBSwann, George E A
5Coscinodiscus marginatusC. marginatus%Swann, George E A
6Coscinodiscus radiatusC. radiatus%Swann, George E A
7Diatoms, otherDiatom oth%Swann, George E A
8Carbon dioxide, partial pressurepCO2µatmSwann, George E Aaquatic
9Carbon dioxide, partial pressure, standard deviationpCO2 std dev±Swann, George E Aaquatic, 1 sigma uncertainty
Size:
217 data points

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