North Atlantic Plio-Pleistocene IRD and Isotope Data McIntyre, K.; Delaney, M.L.; Ravelo, A.C. McIntyre, K. Delaney, M.L. Ravelo, A.C. earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (ice rafted debris,sediment,null,count per gram,null,paleoceanography,null,null,N,>212 microns) earth science/paleoclimate/paleoceanography (Neogloboquadrina pachyderma sinistral,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (Neogloboquadrina pachyderma dextral,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (MIS70>LATITUDE 60.4>LONGITUDE -23.63) (MIS64>LATITUDE 60.4>LONGITUDE -23.63) We generated 200--500 year resolution records of oceanic processes in the North Atlantic (Ocean Drilling Program Site 983, 60°24'N, 23°38'W, 1983 meters water depth) for intervals in the latest Pliocene (1.86--1.93 Ma) and the earliest Pleistocene (1.75--1.83 Ma) in order to examine the linkages between millennial-scale variations in the ocean and background glacial-interglacial climate change. Within glacial intervals we find evidence for variations similar to those observed in the late Pleistocene. We find discrete ice-rafted debris (IRD) events that reoccur every 2--5 kyr. These events are preceded by a short cooling and accompanied by a reorganization of glacial deep waters. The timing of IRD events in the late Pliocene and early Pleistocene intervals is similar to that of Dansgaard-Oeschger cycles, but we find no IRD events comparable in timing to late Pleistocene Heinrich events. Although interglacial intervals are much more stable, we do find evidence for low-amplitude variations in deep water properties that reoccur every ~2 kyr within interglacial intervals. The similarity between our late Pliocene-early Pleistocene records and late Pleistocene records implies that the mechanism driving millennial-scale variations cannot be uniquely attributed to the strongly nonlinear linkage between climate and insolation and the large ice sheets of the late Pleistocene. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : McIntyre, K. Investigator : Delaney, M.L. Investigator : Ravelo, A.C. 2001-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2609 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/mis64-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/mis70-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcintyre2001 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/mis64-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/mis70-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcintyre2001 English https://www.ncdc.noaa.gov/paleo/study/2609 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/mis64-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/mis70-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcintyre2001 McIntyre, K., M.L. Delaney, and A.C. Ravelo. 2001. Millennial-scale climate change and oceanic processes in the late Pliocene and early Pleistocene. Paleoceanography 16(5):535-543. START YEAR: 1936453 14C yr BP * END YEAR: 1752848 14C yr BP -23.63 60.4 -23.63 60.4