Swann, George E A; Snelling, Andrea M (2015): (Table A1) Diatom isotope measurements from ODP Hole 145-882A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.856071, 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, https://doi.org/10.5194/cp-11-15-2015
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Abstract:
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, https://doi.org/10.1002/jqs.1185
Project(s):
Ocean Drilling Program (ODP)
Coverage:
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
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 * Method/Device: Drilling/drill rig (DRILL) * Comment: 42 cores; 398.3 m cored; 0 m drilled; 103.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Swann, George E A | DSDP/ODP/IODP sample designation | ||
| 2 | DEPTH, sediment/rock | Depth sed | m | Swann, George E A | Geocode – mcd | |
| 3 | AGE | Age | ka BP | Swann, George E A | Geocode | |
| 4 | δ13C, diatom-bound organic matter | δ13C DB | ‰ PDB | Swann, George E A | Element analyser CHN, Costech and Optima mass spectrometer | with respect to VPDB |
| 5 | Diatoms, δ18O | Diatoms δ18O | ‰ SMOW | Swann, George E A | Mass spectrometer, Finnigan, MAT 253 | with respect to VSMOW |
| 6 | Diatoms, δ30Si | Diatoms δ30Si | ‰ NBS | Swann, George E A | Mass spectrometer, Finnigan, MAT 253 | vs. NBS-28 |
| 7 | Carbon | C | % | Swann, George E A | in diatoms | |
| 8 | Coscinodiscus marginatus | C. marginatus | % | Swann, George E A | biovolume | |
| 9 | Coscinodiscus radiatus | C. radiatus | % | Swann, George E A | biovolume | |
| 10 | Diatoms, other | Diatom oth | % | Swann, George E A | biovolume | |
| 11 | Reference/source | Reference | Swann, George E A | origin of d18O data |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
347 data points