noaa-ocean-15776 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. Iberian Margin 420KYr Geochemical and Color Variations Data 2013-12-18 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/15776 Investigator D.A. Hodell Investigator S. Crowhurst Investigator L.C. Skinner Investigator P.C. Tzedakis Investigator V. Margari Investigator J.E.T. Channell Investigator G. Kamenov Investigator S. Maclachlan Investigator G. Rothwell 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 geochemistry earth science paleoclimate paleocean biomarkers earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean physical properties geoscientificInformation 433300 cal yr BP 0 cal yr BP Complete 37.561333 37.8815 -10.1762 -10.142167 -2952 -2637 Ocean Atlantic Ocean North Atlantic Ocean MD01-2444>LATITUDE 37.561333>LONGITUDE -10.142167 Ocean Atlantic Ocean North Atlantic Ocean MD01-2443>LATITUDE 37.8815>LONGITUDE -10.1762 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII David Hodell, Simon Crowhurst, Luke Skinner, Polychronis C. Tzedakis, Vasiliki Margari, James E.T. Channell, George Kamenov, Suzanne Maclachlan, Guy Rothwell 2013 Paleoceanography 28 1 185-199 10.1002/palo.20017

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti-residual.txt Ca/Ti Ratio Residuals; GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013benthic.txt Benthic d18O Data; GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013barium.txt Barium Data; Barium Data Text file GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013color.txt Lightness, red-green, and blue-yellow color data; GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013planktonic.txt Planktonic (G. bulloides) d18O data; GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013.xlsx Geochemical Data; Excel file GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013ca-ti.txt Ca/Ti Ratio ; GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013carb-ca-ti.txt CaCO3 and corresponding Ca/Ti; GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2013/hodell2013biomarker.txt Biomarker Data; USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11