/* DATA DESCRIPTION: Citation: Swann, George E A; Snelling, Andrea M (2015): (Table A1) Diatom isotope measurements from ODP Hole 145-882A. 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 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) (URI: http://www-odp.tamu.edu/) 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 (URI: https://doi.org/10.2973/odp.proc.ir.145.1993) * BASIS: Joides Resolution (URI: http://www-odp.tamu.edu/resolutn.html) * METHOD/DEVICE: Drilling/drill rig (DRILL) * COMMENT: 42 cores; 398.3 m cored; 0 m drilled; 103.2 % recovery Parameter(s): Sample code/label (Sample label) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * METHOD/DEVICE: DSDP/ODP/IODP sample designation (URI: hdl:10013/epic.27914.d001) DEPTH, sediment/rock [m] (Depth sed) * GEOCODE * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * COMMENT: mcd AGE [ka BP] (Age) * GEOCODE * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) δ13C, diatom-bound organic matter [‰ PDB] (δ13C DB) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * METHOD/DEVICE: Element analyser CHN, Costech and Optima mass spectrometer * COMMENT: with respect to VPDB Diatoms, δ18O [‰ SMOW] (Diatoms δ18O) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * METHOD/DEVICE: Mass spectrometer, Finnigan, MAT 253 * COMMENT: with respect to VSMOW Diatoms, δ30Si [‰ NBS] (Diatoms δ30Si) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * METHOD/DEVICE: Mass spectrometer, Finnigan, MAT 253 * COMMENT: vs. NBS-28 Carbon [%] (C) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * COMMENT: in diatoms Coscinodiscus marginatus [%] (C. marginatus) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * COMMENT: biovolume Coscinodiscus radiatus [%] (C. radiatus) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * COMMENT: biovolume Diatoms, other [%] (Diatom oth) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * COMMENT: biovolume Reference/source (Reference) * PI: Swann, George E A (https://orcid.org/0000-0002-4750-9504, george.swann@nottingham.ac.uk) * COMMENT: origin of d18O data License: Creative Commons Attribution 3.0 Unported (CC-BY-3.0) (URI: https://creativecommons.org/licenses/by/3.0/) Size: 347 data points */ Sample label Depth sed [m] Age [ka BP] δ13C DB [‰ PDB] Diatoms δ18O [‰ SMOW] Diatoms δ30Si [‰ NBS] C [%] C. marginatus [%] C. radiatus [%] Diatom oth [%] Reference 145-882A-1H-2 W,89-90 3.035 57.16 -20.3 39.9 1.37 0.41 0.7 99.3 0.1 This study 145-882A-1H-2 W,95-96 3.095 58.13 38.6 1.31 0.4 97.2 2.5 This study 145-882A-1H-2 W,102-103 3.165 59.26 37.8 0.85 0.8 99.2 0.0 This study 145-882A-1H-2 W,108-109 3.225 59.93 39.8 0.4 96.6 3.0 Swann et al., (2008) 145-882A-1H-2 W,114-115 3.285 60.39 39.4 0.84 0.6 99.4 0.0 This study 145-882A-1H-3 W,14-15 3.785 64.23 38.6 1.59 0.5 98.9 0.6 This study 145-882A-1H-3 W,38-39 4.025 67.22 37.3 1.01 0.0 100.0 0.0 This study 145-882A-1H-3 W,45-46 4.095 68.15 -17.5 40.0 1.41 0.20 0.0 99.9 0.1 This study 145-882A-1H-3 W,53-54 4.175 69.21 43.2 0.2 98.7 1.1 Swann et al., (2008) 145-882A-1H-3 W,61-62 4.255 70.28 38.8 1.17 0.0 99.9 0.1 This study 145-882A-1H-3 W,68-69 4.325 71.21 37.9 1.47 0.0 100.0 0.0 This study 145-882A-1H-3 W,76-77 4.405 72.27 -18.8 38.9 1.26 0.25 0.4 99.6 0.0 This study 145-882A-1H-3 W,83-84 4.475 73.20 42.6 0.4 97.5 2.0 Swann et al., (2008) 145-882A-1H-3 W,91-92 4.555 74.26 -15.4 39.3 1.20 0.32 0.0 100.0 0.0 This study 145-882A-1H-3 W,99-100 4.635 75.33 40.6 1.06 0.0 100.0 0.0 This study 145-882A-1H-3 W,106-107 4.705 76.26 36.4 1.1 94.9 4.0 Swann et al., (2008) 145-882A-1H-3 W,114-115 4.785 77.32 -19.7 0.19 0.6 99.4 0.0 This study 145-882A-1H-3 W,121-122 4.855 78.20 -19.7 38.7 0.87 0.37 0.5 99.5 0.0 This study 145-882A-1H-4 W,13-14 5.275 83.20 37.8 1.02 0.4 99.6 0.0 This study 145-882A-1H-4 W,22-23 5.365 84.27 37.9 0.4 96.0 3.5 Swann et al., (2008) 145-882A-1H-4 W,30-31 5.445 85.44 40.3 1.13 0.0 100.0 0.0 This study 145-882A-1H-4 W,37-38 5.515 86.88 -15.6 42.5 1.24 0.37 0.0 100.0 0.0 This study 145-882A-1H-4 W,45-46 5.595 88.51 -17.6 42.4 1.21 0.41 1.1 98.9 0.0 This study 145-882A-1H-4 W,52-53 5.665 89.95 42.2 0.2 96.6 3.2 Swann et al., (2008) 145-882A-1H-4 W,60-61 5.745 91.40 -15.8 42.1 1.17 0.36 0.5 99.5 0.0 This study 145-882A-1H-4 W,67-68 5.815 92.45 -14.9 43.2 1.30 0.37 0.0 100.0 0.0 This study 145-882A-1H-4 W,74-75 5.885 93.50 -15.4 42.5 1.14 0.35 1.1 98.9 0.1 This study 145-882A-1H-4 W,82-83 5.965 94.70 41.6 0.0 97.9 2.1 Swann et al., (2008) 145-882A-1H-4 W,90-91 6.045 95.90 -14.5 42.9 1.24 0.33 0.0 100.0 0.0 This study 145-882A-1H-4 W,98-99 6.125 97.10 -15.4 42.6 1.17 0.33 0.0 100.0 0.0 This study 145-882A-1H-4 W,107-108 6.215 98.45 39.8 0.2 95.8 4.0 Swann et al., (2008) 145-882A-1H-4 W,115-116 6.295 99.65 -16.8 42.6 1.16 0.39 0.4 99.6 0.0 This study 145-882A-1H-4 W,123-124 6.375 100.85 -19.3 42.3 1.09 0.35 0.3 99.7 0.0 This study 145-882A-1H-4 W,131-132 6.455 102.05 -18.9 42.5 1.01 0.34 0.4 99.6 0.0 This study 145-882A-1H-5 W,14-15 6.785 107.41 -19.7 41.6 0.94 0.38 1.2 98.8 0.0 This study 145-882A-1H-5 W,27-28 6.915 109.98 34.0 0.66 10.8 88.6 0.6 This study 145-882A-1H-5 W,32-33 6.965 110.97 -19.3 38.4 0.30 13.7 86.2 0.0 This study 145-882A-1H-5 W,42-43 7.065 112.94 38.7 24.8 66.3 8.9 Swann et al., (2008) 145-882A-1H-5 W,46-47 7.105 113.73 -17.9 42.2 0.73 0.33 5.4 94.6 0.0 This study 145-882A-1H-5 W,49-50 7.135 115.16 -16.6 41.0 0.94 0.29 18.6 81.4 0.0 This study 145-882A-1H-5 W,52-53 7.165 116.76 41.3 19.9 73.7 6.4 Swann et al., (2008) 145-882A-1H-5 W,55-56 7.195 118.35 -15.5 42.5 0.80 0.25 17.3 82.1 0.6 This study 145-882A-1H-5 W,58-59 7.225 119.95 -17.7 42.4 0.98 0.31 14.9 84.5 0.6 This study 145-882A-1H-5 W,62-63 7.265 122.07 -17.7 41.4 0.84 0.25 9.4 90.6 0.0 This study 145-882A-1H-5 W,66-67 7.305 124.20 40.3 3.9 95.6 0.5 Swann et al., (2008)