Thornalley, David J R; Barker, Stephen; Becker, Julia; Hall, Ian R; Knorr, Gregor (2013): (Table S1) Tie-points used in age model construction for ODP Leg 172 sites [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.821830, Supplement to: Thornalley, DJR et al. (2013): Abrupt changes in deep Atlantic circulation during the transition to full glacial conditions. Paleoceanography, 28(2), 253-262, https://doi.org/10.1002/palo.20025
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Abstract:
ix Ocean Drilling Program (ODP) sites, in the Northwest Atlantic have been used to investigate kinematic and chemical changes in the "Western Boundary Undercurrent" (WBUC) during the development of full glacial conditions across the Marine Isotope Stage 5a/4 boundary (~70,000 years ago). Sortable silt mean grain size(sort s) measurements are employed to examine changes in near bottom flow speeds, together with carbon isotopes measured in benthic foraminifera and % planktic foraminiferal fragmentation as proxies for changes in water-mass chemistry. A depth transect of cores, spanning 1.8-4.6 km depth, allows changes in both the strength and depth of the WBUC to be constrained across millennial scale events. Sort s measurements reveal that the flow speed structure of the WBUC during warm intervals ("interstadials") was comparable to modern (Holocene) conditions. However, significant differences are observed during cold intervals, with higher relative flow speeds inferred for the shallow component of the WBUC (~2 km depth) during all cold "stadial" intervals (including Heinrich Stadial 6), and a substantial weakening of the deep component (~3-4 km) during full glacial conditions. Our results therefore reveal that the onset of full glacial conditions was associated with a regime shift to a shallower mode of circulation (involving Glacial North Atlantic Intermediate Water) that was quantitatively distinct from preceding cold stadial events. Furthermore, our chemical proxy data show that the physical response of the WBUC during the last glacial inception was probably coupled to basin-wide changes in the water-mass composition of the deep Northwest Atlantic.
Further details:
Hoogakker, Babette A A; McCave, I Nick; Vautravers, Maryline J (2007): Antarctic link to deep flow speed variation during Marine Isotope Stage 3 in the western North Atlantic. Earth and Planetary Science Letters, 257(3-4), 463-473, https://doi.org/10.1016/j.epsl.2007.03.003
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.818153 * Median Longitude: -72.244231 * South-bound Latitude: 29.975389 * West-bound Longitude: -76.286278 * North-bound Latitude: 33.686444 * East-bound Longitude: -57.615000
Date/Time Start: 1997-02-21T00:00:00 * Date/Time End: 1997-03-25T00:00:00
Minimum DEPTH, sediment/rock: 55.60 m * Maximum DEPTH, sediment/rock: 85.30 m
Event(s):
172-1055 * Latitude: 32.784333 * Longitude: -76.286278 * Date/Time: 1997-02-21T00:00:00 * Elevation: -1798.1 m * Penetration: 405.4 m * Recovery: 429.4 m * Location: Carolina Slope, North Atlantic Ocean * Campaign: Leg172 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 45 cores; 405.4 m cored; 0 m drilled; 105.9% recovery
172-1057 * Latitude: 32.028861 * Longitude: -76.079222 * Date/Time: 1997-02-25T00:00:00 * Elevation: -2583.8 m * Penetration: 341.2 m * Recovery: 364.2 m * Location: Carolina Slope, North Atlantic Ocean * Campaign: Leg172 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 37 cores; 341.2 m cored; 0 m drilled; 106.7% recovery
172-1059 * Latitude: 31.674194 * Longitude: -75.418528 * Date/Time: 1997-03-03T00:00:00 * Elevation: -2985.1 m * Penetration: 286 m * Recovery: 301.9 m * Location: Blake Outer Ridge, North Atlantic Ocean * Campaign: Leg172 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 31 cores; 286 m cored; 0 m drilled; 105.6% recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Elevation of event | Elevation | m | |||
| 5 | DEPTH, sediment/rock | Depth sed | m | Geocode – mbsf | ||
| 6 | Age model | Age model | ka | Thornalley, David J R | ||
| 7 | Tie point | Tie point | Thornalley, David J R |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
140 data points
Data
| 1 Event | 2 Latitude | 3 Longitude | 4 Elevation [m] | 5 Depth sed [m] | 6 Age model [ka] | 7 Tie point |
|---|---|---|---|---|---|---|
| 172-1055 | 32.784 | -76.286 | -1798 | 59.55 | 11.160 | G. ruber d18O - onset DO17 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 63.10 | 11.460 | G. ruber and G. inflata d18O - end DO18 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 64.20 | 11.700 | G. ruber and G. inflata d18O - onset DO18 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 68.90 | 12.450 | G. ruber d18O /minimum in %CF - 'DO19a' NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 71.68 | 13.560 | G. ruber d18O - mid-point onset DO19 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 73.16 | 13.860 | G. ruber d18O - end DO20 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 75.70 | 14.490 | G. ruber d18O - onset DO20 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 76.80 | 14.580 | G. ruber d18O - end DO21 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 78.40 | 14.820 | G. ruber d18O /minimum in %CF - warming prior to end DO21 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 82.18 | 15.420 | G. ruber d18O - end of peak warmth of DO21 NGRIP |
| 172-1055 | 32.784 | -76.286 | -1798 | 84.04 | 15.810 | G. ruber d18O - onset of peak warmth of DO21 NGRIP |
| 172-1057 | 32.029 | -76.079 | -2584 | 59.50 | 9.030 | G. ruber d18O - onset DO17 NGRIP |
| 172-1057 | 32.029 | -76.079 | -2584 | 67.20 | 10.480 | G. ruber d18O - G. ruber Site 1055/1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 69.50 | 10.680 | G. ruber d18O - end DO19 NGRIP |
| 172-1057 | 32.029 | -76.079 | -2584 | 70.90 | 10.830 | G. ruber d18O - G. ruber Site 1055/1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 72.00 | 11.080 | G. ruber d18O - G. ruber Site 1055/1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 73.70 | 11.230 | G. ruber d18O - G. ruber Site 1055/1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 75.70 | 11.380 | G. ruber d18O - G. ruber Site 1055/1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 78.70 | 11.530 | G. ruber d18O - G. ruber Site 1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 80.50 | 11.630 | G. ruber d18O - G. ruber Site 1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 83.00 | 11.830 | G. ruber d18O - G. ruber Site 1059 |
| 172-1057 | 32.029 | -76.079 | -2584 | 85.30 | 11.980 | G. ruber d18O - G. ruber Site 1059 |
| 172-1059 | 31.674 | -75.419 | -2985 | 59.15 | 21.625 | G. ruber d18O - DO17 NGRIP |
| 172-1059 | 31.674 | -75.419 | -2985 | 69.09 | 26.050 | G. ruber d18O - onset 'DO19a' NGRIP |
| 172-1059 | 31.674 | -75.419 | -2985 | 70.00 | 26.290 | G. ruber d18O - end DO19 NGRIP |
| 172-1059 | 31.674 | -75.419 | -2985 | 71.70 | 26.930 | G. ruber d18O - onset DO19 NGRIP |
| 172-1059 | 31.674 | -75.419 | -2985 | 72.80 | 27.090 | G. ruber d18O - end DO20 NGRIP |
| 172-1059 | 31.674 | -75.419 | -2985 | 75.50 | 27.650 | G. ruber d18O - onset DO20 NGRIP |
| 172-1059 | 31.674 | -75.419 | -2985 | 77.10 | 27.900 | G. ruber d18O - end DO21 NGRIP |
| 172-1059 | 31.674 | -75.419 | -2985 | 83.80 | 30.010 | G. ruber d18O - early DO21 NGRIP |
| 172-1060 | 30.760 | -74.466 | -3481 | 59.50 | 21.800 | Faunal assemblage [Hoogakker et al., 2007] - onset DO17 NGRIP |
| 172-1060 | 30.760 | -74.466 | -3481 | 63.30 | 23.440 | Faunal assemblage [Hoogakker et al., 2007] - DO18 NGRIP |
| 172-1060 | 30.760 | -74.466 | -3481 | 69.05 | 31.020 | % carbonate to Site 1063 (end of DO19) |
| 172-1060 | 30.760 | -74.466 | -3481 | 71.70 | 31.420 | % carbonate to Site 1063 (onset of DO19) |
| 172-1060 | 30.760 | -74.466 | -3481 | 73.10 | 33.120 | % carbonate to Site 1063 (end DO20) |
| 172-1060 | 30.760 | -74.466 | -3481 | 75.70 | 33.620 | % carbonate to Site 1063 (onset DO20) |
| 172-1060 | 30.760 | -74.466 | -3481 | 76.90 | 33.820 | % carbonate to Site 1063 (end DO21) |
| 172-1060 | 30.760 | -74.466 | -3481 | 84.40 | 34.820 | % carbonate to Site 1063 (onset DO21) |
| 172-1061 | 29.975 | -73.600 | -4040 | 56.10 | 19.220 | G. inflata d18O - end DO16 NGRIP |
| 172-1061 | 29.975 | -73.600 | -4040 | 59.11 | 21.500 | G. inflata d18O - onset DO17 NGRIP |
| 172-1061 | 29.975 | -73.600 | -4040 | 63.80 | 26.505 | G. inflata d18O - mid DO18 NGRIP |
| 172-1061 | 29.975 | -73.600 | -4040 | 69.20 | 28.445 | % carbonate to Site 1063 (end of DO19) |
| 172-1061 | 29.975 | -73.600 | -4040 | 71.70 | 28.765 | G. inflata d18O - onset DO19 NGRIP |
| 172-1061 | 29.975 | -73.600 | -4040 | 72.80 | 30.125 | G. inflata d18O - end DO20 NGRIP |
| 172-1061 | 29.975 | -73.600 | -4040 | 73.30 | 30.345 | % carbonate to Site 1063 (end of DO20) |
| 172-1061 | 29.975 | -73.600 | -4040 | 75.14 | 30.445 | % carbonate to Site 1063 (onset of DO20) |
| 172-1061 | 29.975 | -73.600 | -4040 | 76.60 | 31.065 | % carbonate to Site 1063 (end of DO21) |
| 172-1061 | 29.975 | -73.600 | -4040 | 81.74 | 31.530 | % carbonate to Site 1063 (minima within DO21) |
| 172-1061 | 29.975 | -73.600 | -4040 | 83.80 | 31.690 | G. inflata d18O - onset DO21 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 55.60 | 22.565 | G. inflata d18O - onset DO15 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 55.90 | 22.685 | G. inflata d18O - end DO16 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 57.80 | 23.005 | G. inflata d18O - peak DO16 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 58.50 | 23.285 | G. inflata d18O - onset DO16 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 59.10 | 23.485 | G. inflata d18O - DO17 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 59.70 | 23.765 | G. inflata d18O - onset DO17 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 63.80 | 25.010 | G. inflata d18O - peak DO18 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 69.10 | 26.890 | G. inflata d18O - peak DO19a NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 69.77 | 27.250 | G. inflata d18O - end DO19 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 70.20 | 27.770 | G. inflata d18O - onset of abrupt cooling ending DO19 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 71.55 | 28.290 | G. inflata d18O - peak DO19 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 71.90 | 28.690 | G. inflata d18O - onset of transition into DO19 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 73.00 | 28.900 | G. inflata d18O - end DO20 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 75.50 | 29.420 | G. inflata d18O - peak DO20 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 75.66 | 29.580 | G. inflata d18O - onset of transition into DO20 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 76.70 | 29.700 | G. inflata d18O - end of transition end DO21 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 77.25 | 29.780 | G. inflata d18O - start of transition end DO21 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 78.80 | 30.020 | G. inflata d18O - warming event near end of DO21 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 83.20 | 30.580 | G. inflata d18O - end of peak warmth during DO21 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 84.04 | 30.740 | G. inflata d18O - end of transition into DO21 NGRIP |
| 172-1063 | 33.686 | -57.615 | -4584 | 84.40 | 31.020 | G. inflata d18O - onset of transition into DO21 NGRIP |