Hernández-Almeida, Iván; Sierro, Francisco Javier; Cacho, Isabel; Flores, José-Abel (2012): Oxygen isotopes, IRD and SST reconstruction for the interval MIS31-19 of IODP Site 306-U1314 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.842180, Supplement to: Hernández-Almeida, I et al. (2012): Impact of suborbital climate changes in the North Atlantic on ice sheet dynamics at the Mid-Pleistocene Transition. Paleoceanography, 27(3), PA3214, https://doi.org/10.1029/2011PA002209
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Abstract:
Early and Mid-Pleistocene climate, ocean hydrography and ice sheet dynamics have been reconstructed using a high-resolution data set (planktonic and benthic d18O time series, faunal-based sea surface temperature (SST) reconstructions and ice-rafted debris (IRD)) record from a high-deposition-rate sedimentary succession recovered at the Gardar Drift formation in the subpolar North Atlantic (Integrated Ocean Drilling Program Leg 306, Site U1314). Our sedimentary record spans from late in Marine Isotope Stage (MIS) 31 to MIS 19 (1069-779 ka). Different trends of the benthic and planktonic oxygen isotopes, SST and IRD records before and after MIS 25 (~940 ka) evidence the large increase in Northern Hemisphere ice-volume, linked to the cyclicity change from the 41-kyr to the 100-kyr that occurred during the Mid-Pleistocene Transition (MPT). Beside longer glacial-interglacial (G-IG) variability, millennial-scale fluctuations were a pervasive feature across our study. Negative excursions in the benthic d18O time series observed at the times of IRD events may be related to glacio-eustatic changes due to ice sheets retreats and/or to changes in deep hydrography. Time series analysis on surface water proxies (IRD, SST and planktonic d18O) of the interval between MIS 31 to MIS 26 shows that the timing of these millennial-scale climate changes are related to half-precessional (10 kyr) components of the insolation forcing, which are interpreted as cross-equatorial heat transport toward high latitudes during both equinox insolation maxima at the equator.
Project(s):
Coverage:
Latitude: 56.364000 * Longitude: -27.888000
Date/Time Start: 2005-04-07T00:00:00 * Date/Time End: 2005-04-10T00:00:00
Event(s):
306-U1314 * Latitude: 56.364000 * Longitude: -27.888000 * Date/Time Start: 2005-04-07T00:00:00 * Date/Time End: 2005-04-10T00:00:00 * Elevation: -2800.0 m * Recovery: 765.63 m * Location: North Atlantic * Campaign: Exp306 (North Atlantic Climate 2) * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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6 datasets
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Datasets listed in this publication series
- Hernández-Almeida, I; Sierro, FJ; Cacho, I et al. (2012): (Table 1) Tie points used in the correlation between benthic δ¹⁸O from IODP Site 306-U1314 and benthic isotope stack LR04. https://doi.org/10.1594/PANGAEA.824859
- Hernández-Almeida, I; Sierro, FJ; Cacho, I et al. (2012): Corrected benthic stable oxygen isotope record of IODP Site 306-U1314. https://doi.org/10.1594/PANGAEA.842175
- Hernández-Almeida, I; Sierro, FJ; Cacho, I et al. (2012): Planktonic stable oxygen isotope record of IODP Site 306-U1314. https://doi.org/10.1594/PANGAEA.842176
- Hernández-Almeida, I; Sierro, FJ; Cacho, I et al. (2012): Ice rafted debris of IODP Site 306-U1314. https://doi.org/10.1594/PANGAEA.842179
- Hernández-Almeida, I; Sierro, FJ; Cacho, I et al. (2012): SST reconstruction based on MARGO for IODP Site 306-U1314. https://doi.org/10.1594/PANGAEA.842177
- Hernández-Almeida, I; Sierro, FJ; Cacho, I et al. (2012): SST reconstruction based on MAT for IODP Site 306-U1314. https://doi.org/10.1594/PANGAEA.842178