(Table A1) Diatom isotope measurements from ODP Hole 145-882A ...

• Main Authors: Swann, George E A, Snelling, Andrea M
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: Sample code/label; DEPTH, sediment/rock; AGE; δ13C, diatom-bound organic matter; Diatoms, δ18O; Diatoms, δ30Si; Carbon; Coscinodiscus marginatus; Coscinodiscus radiatus; Diatoms, other; Reference/source; Drilling/drill rig; DSDP/ODP/IODP sample designation; Element analyser CHN, Costech and Optima mass spectrometer; Mass spectrometer, Finnigan, MAT 253; Leg145; Joides Resolution; Ocean Drilling Program ODP; Pacific; Swann; Subarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.856071; https://doi.pangaea.de/10.1594/PANGAEA.856071

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 ... : Supplement to: Swann, George E A; Snelling, Andrea M (2015): Photic zone changes in the north-west Pacific Ocean from MIS 4–5e. Climate of the Past, 11(1), 15-25 ...