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Hodell, David A; Crowhurst, Simon J; Skinner, Luke C; Tzedakis, Polychronis C; Margari, Vasiliki; Channell, James E T; Kamenov, George D; Maclachlan, Suzanne; Rothwell, Robin Guy (2013): Iberian Margin 420 kyr geochemical and color variations record [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.831762, Supplement to: Hodell, DA et al. (2013): Response of Iberian Margin sediments to orbital and suborbital forcing over the past 420 ka. Paleoceanography, 28(1), 185-199, https://doi.org/10.1002/palo.20017

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Abstract:
Here we report 420 kyr long records of sediment geochemical and color variations from the southwestern Iberian Margin. We synchronized the Iberian Margin sediment record to Antarctic ice cores and speleothem records on millennial time scales and investigated the phase responses relative to orbital forcing of multiple proxy records available from these cores. Iberian Margin sediments contain strong precession power. Sediment "redness" (a* and 570-560 nm) and the ratio of long-chain alcohols to n-alkanes (C26OH/(C26OH + C29)) are highly coherent and in-phase with precession. Redder layers and more oxidizing conditions (low alcohol ratio) occur near precession minima (summer insolation maxima). We suggest these proxies respond rapidly to low-latitude insolation forcing by wind-driven processes (e.g., dust transport, upwelling, precipitation). Most Iberian Margin sediment parameters lag obliquity maxima by 7-8 ka, indicating a consistent linear response to insolation forcing at obliquity frequencies driven mainly by high-latitude processes. Although the lengths of the time series are short (420 ka) for detecting 100 kyr eccentricity cycles, the phase relationships support those obtained by Shackleton []. Antarctic temperature and the Iberian Margin alcohol ratios (C26OH/(C26OH + C29)) lead eccentricity maxima by 6 kyr, with lower ratios (increased oxygenation) occurring at eccentricity maxima. CO2, CH4, and Iberian SST are nearly in phase with eccentricity, and minimum ice volume (as inferred from Pacific d18Oseawater) lags eccentricity maxima by 10 kyr. The phase relationships derived in this study continue to support a potential role of the Earth's carbon cycle in contributing to the 100 kyr cycle.
Other version:
Hodell, David A; Crowhurst, Simon J; Skinner, Luke C; Tzedakis, Polychronis C; Margari, Vasiliki; Channell, James E T; Kamenov, George D; Maclachlan, Suzanne; Rothwell, Robin Guy (2013): NOAA/WDS Paleoclimatology - Iberian Margin 420KYr Geochemical and Color Variations Data. NOAA National Centers for Environmental Information, https://doi.org/10.25921/8KZ8-V888
Coverage:
Median Latitude: 37.688458 * Median Longitude: -10.150419 * South-bound Latitude: 37.565000 * West-bound Longitude: -10.176000 * North-bound Latitude: 37.881000 * East-bound Longitude: -10.134000
Date/Time Start: 1995-07-09T00:00:00 * Date/Time End: 1995-07-09T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Age model of composite sediment core MD01-2444/2443. https://doi.org/10.1594/PANGAEA.831753
  2. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Barium counts measured in sediment cores MD01-2444 and MD01-2443. https://doi.org/10.1594/PANGAEA.831757
  3. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Biomarker and sea surface temperature reconstruction for sediment cores MD01-2444 and MD01-2443. https://doi.org/10.1594/PANGAEA.831759
  4. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Ca/Ti ratios in sediment composite sediment core MD01-2444/2443. https://doi.org/10.1594/PANGAEA.831755
  5. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Ca/Ti residual in sediment composite sediment core MD01-2444/2443. https://doi.org/10.1594/PANGAEA.831756
  6. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Oxygen isotope record of Globigerina bulloides for sediment cores MD01-2444 and MD01-2443. https://doi.org/10.1594/PANGAEA.831760
  7. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Lightness (L*), red-green (a*), blue-yellow (b*), and the 570-560 nm binned wavelength measured in sediment cores MD01-2444 and MD01-2443. https://doi.org/10.1594/PANGAEA.831758
  8. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Calcium carbonate and corresponding Ca/Ti ratios in sediment core MD01-2444. https://doi.org/10.1594/PANGAEA.831754
  9. Hodell, DA; Crowhurst, SJ; Skinner, LC et al. (2013): Oxygen isotope record of benthic foraminifera for sediment cores MD01-2444, MD95-2042 and MD01-2443. https://doi.org/10.1594/PANGAEA.831761