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Swann, George E A; Snelling, Andrea M (2015): (Table A1) Diatom isotope measurements from ODP Hole 145-882A. PANGAEA,, Supplement to: Swann, GEA; Snelling, AM (2015): Photic zone changes in the north-west Pacific Ocean from MIS 4–5e. Climate of the Past, 11(1), 15-25,

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In comparison to other sectors of the marine system, the palaeoceanography of the subarctic North Pacific Ocean is poorly constrained. New diatom isotope records of d13C, d18O, d30Si (d13Cdiatom, d18Odiatom, and d30Sidiatom) are presented alongside existing geochemical and isotope records to document changes in photic zone conditions, including nutrient supply and the efficiency of the soft-tissue biological pump, between Marine Isotope Stage (MIS) 4 and MIS 5e. Peaks in opal productivity in MIS 5b/c and MIS 5e are both associated with the breakdown of the regional halocline stratification and increased nutrient supply to the photic zone. Whereas the MIS 5e peak is associated with low rates of nutrient utilisation, the MIS 5b/c peak is associated with significantly higher rates of nutrient utilisation. Both peaks, together with other smaller increases in productivity in MIS 4 and 5a, culminate with a significant increase in freshwater input which strengthens/re-establishes the halocline and limits further upwelling of sub-surface waters to the photic zone. Whilst d30Sidiatom and previously published records of diatom d15N (d15Ndiatom) (Brunelle et al., 2007, 2010) show similar trends until the latter half of MIS 5a, the records become anti-correlated after this juncture and into MIS 4, suggesting a possible change in photic zone state such as may occur with a shift to iron or silicon limitation.
Related to:
Swann, George E A; Leng, Melanie J; Sloane, Hilary J; Maslin, Mark A (2008): Isotope offsets in marine diatom d18O over the last 200 ka. Journal of Quaternary Science, 23(4), 389-400,
Latitude: 50.363300 * Longitude: 167.600000
Date/Time Start: 1992-07-08T10:30:00 * Date/Time End: 1992-08-05T17:45:00
Minimum DEPTH, sediment/rock: 3.035 m * Maximum DEPTH, sediment/rock: 7.305 m
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
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/labelSample labelSwann, George E AODP sample designation
2DEPTH, sediment/rockDepthmSwann, George E AGeocode – mcd
3AGEAgeka BPSwann, George E AGeocode
4δ13C, diatom-bound organic matterδ13C DB‰ PDBSwann, George E AElement analyser CHN, Costech and Optima mass spectrometerwith respect to VPDB
5Diatoms, d18ODiatoms d18Oper mil SMOWSwann, George E AMass spectrometer Finnigan MAT 253with respect to VSMOW
6Diatoms, d30SiDiatoms d30Siper mil NBSSwann, George E AMass spectrometer Finnigan MAT 253vs. NBS-28
7CarbonC%Swann, George E Ain diatoms
8Coscinodiscus marginatusC. marginatus%Swann, George E Abiovolume
9Coscinodiscus radiatusC. radiatus%Swann, George E Abiovolume
10Diatoms, otherDiatom oth%Swann, George E Abiovolume
11Reference/sourceReferenceSwann, George E Aorigin of d18O data
347 data points

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