Iberian Margin 420KYr Geochemical and Color Variations Data Hodell, D.A.; Crowhurst, S.; Skinner, L.C.; Tzedakis, P.C.; Margari, V.; Channell, J.E.T.; Kamenov, G.; Maclachlan, S.; Rothwell, G. Hodell, D.A. Crowhurst, S. Skinner, L.C. Tzedakis, P.C. Margari, V. Channell, J.E.T. Kamenov, G. Maclachlan, S. Rothwell, G. earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (barium,sediment,null,count per second,null,paleoceanography,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleoceanography (delta 18O,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone,null,null,percent,null,paleoceanography,null,null,N,C26OH/C26OH+C29) earth science/paleoclimate/paleoceanography (calcium/titanium,sediment,null,dimensionless,null,paleoceanography,anomalized,null,N,residual from Loess weighted least squares curve fit) earth science/paleoclimate/paleoceanography (calcium/titanium,sediment,null,dimensionless,null,paleoceanography,normalized,x-ray fluorescence spectroscopy,N,log values) earth science/paleoclimate/paleoceanography (lightness,sediment,null,percent,null,paleoceanography,null,spectrophotometry,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium/titanium,sediment,null,dimensionless,null,paleoceanography,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleoceanography (calcium/titanium,sediment,null,null,null,paleoceanography,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleoceanography (blue-yellow contrast,sediment,null,dimensionless,null,paleoceanography,null,spectrophotometry,N,blue-yellow diffuse color reflectance on CIE scale) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Martrat et al. 2007 MD012444) earth science/paleoclimate/paleoceanography (C37:4 alkenone,null,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,GLt_syn age) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,MBSF) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,Core name) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (red-green contrast,sediment,null,dimensionless,null,paleoceanography,null,spectrophotometry,N,red-green diffuse color reflectance on CIE scale) earth science/paleoclimate/paleoceanography (reflectance,sediment,null,nanometer,null,paleoceanography,null,spectrophotometry,N,570 minus 560 nm binned wavelength) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (MD01-2444>LATITUDE 37.561333>LONGITUDE -10.142167) (MD01-2443>LATITUDE 37.8815>LONGITUDE -10.1762) 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 [2000]. 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. STUDY NOTES: Sediment geochemical data and color variations from 2 marine sediment cores collected along the southwestern Iberian Margin. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Hodell, D.A. Investigator : Crowhurst, S. Investigator : Skinner, L.C. Investigator : Tzedakis, P.C. Investigator : Margari, V. Investigator : Channell, J.E.T. Investigator : Kamenov, G. Investigator : Maclachlan, S. Investigator : Rothwell, G. 2013-12-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/15776 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti-residual.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013benthic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013barium.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013color.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013planktonic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013carb-ca-ti.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013biomarker.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti-residual.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013benthic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013barium.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013color.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013planktonic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013carb-ca-ti.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013biomarker.txt English https://www.ncdc.noaa.gov/paleo/study/15776 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti-residual.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013benthic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013barium.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013color.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013planktonic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013carb-ca-ti.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013biomarker.txt David Hodell, Simon Crowhurst, Luke Skinner, Polychronis C. Tzedakis, Vasiliki Margari, James E.T. Channell, George Kamenov, Suzanne Maclachlan, Guy Rothwell2013Response of Iberian Margin sediments to orbital and suborbital forcing over the past 420 kaPaleoceanography281185-19910.1002/palo.20017 START YEAR: 433300 cal yr BP * END YEAR: 0 cal yr BP -10.1762 37.561333 -10.142167 37.8815