georefid:1999-049373SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1029/1998PA900021<gco:CharacterString>Diffuse spectral reflectance as a proxy for percent carbonate content in North Atlantic sediments</gco:CharacterString>1999-01-01publicationgeorefid:1999-049373doi:10.1029/1998PA900021Ortiz, JosephLamont-Doherty Earth Observatory, Palisades, NY, United StatesauthorMix, Alan C.Oregon State University, United StatesauthorHarris, SaraWesleyan University, United StatesauthorO'Connell, SuzanneauthorAmerican Geophysical Union, Washington, DC, United StatespublisherdocumentDigitalPaleoceanography14 (2)171-186Diffuse reflectance records from Feni Drift in the North Atlantic faithfully record sediment percent carbonate. A high-resolution, reflectance-based age model for these sediments derived from an orbitally tuned age model for western equatorial Atlantic, Ceara Rise sediments was generated by spectral frequency mapping. Power spectra of the Feni Drift record indicate statistically significant sub-Milankovitch cyclicity at 7.6-8.4 and 4.8-6.1 kyr. We infer that these approximately 8 and approximately 5 kyr cycles document a linkage between North and equatorial Atlantic climate given our ability to correlate these records. These climate cycles influence Atlantic basin carbonate prior to the intensification of Northern Hemisphere glaciation and thus must arise from some portion of the climate system other than the dynamics of large ice sheets. The presence of these peaks, which could be related to equatorial clipped precession, implies a possible non-linear response to Milankovitch forcing.completedStratigraphyAtlantic OceancarbonatesCenozoicclimate changecyclesDansgaard-Oeschger cyclesdepositional environmentFeni Driftfrequencygeophysical methodsgeophysical surveysHeinrich eventsLeg 154Leg 162marine sedimentsMilankovitch theoryNeogeneNorth AtlanticOcean Drilling ProgramODP Site 926ODP Site 980ODP Site 981ODP Site 982ODP Site 983ODP Site 984paleoclimatologyPlioceneQuaternaryreflection methodssedimentsseismic methodssurveysTertiaryurn:org.iodp:exp:154urnlargerWorkCitationcampaignurn:org.iodp:exp:162urnlargerWorkCitationcampaignurn:org.iodp:exp:154:site:926urnlargerWorkCitationstudyurn:org.iodp:exp:154urnlargerWorkCitationcampaignurn:org.iodp:exp:162:site:980urnlargerWorkCitationstudyurn:org.iodp:exp:162urnlargerWorkCitationcampaignurn:org.iodp:exp:162:site:981urnlargerWorkCitationstudyurn:org.iodp:exp:162urnlargerWorkCitationcampaignurn:org.iodp:exp:162:site:982urnlargerWorkCitationstudyurn:org.iodp:exp:162urnlargerWorkCitationcampaignurn:org.iodp:exp:162:site:983urnlargerWorkCitationstudyurn:org.iodp:exp:162urnlargerWorkCitationcampaignurn:org.iodp:exp:162:site:984urnlargerWorkCitationstudyurn:org.iodp:exp:162urnlargerWorkCitationcampaignEnglishgeoscientificInformation-80.000020.00000.000075.0000North Atlanticapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www.agu.org/journals/pa/v014/i002/1998PA900021/1998PA900021.pdfdownload