Subtropical North Atlantic Stable Isotope Data During the mid-Pleistocene Poirier, R.K.; Billups, K. Poirier, R.K. Billups, K. earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides mundula|Oridorsalis umbonatus,null,per mil VPDB,null,paleoceanography,null,null,N,>150 µm) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides mundula|Oridorsalis umbonatus,null,per mil VPDB,null,paleoceanography,null,null,N,>150 µm) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP1063>LATITUDE 33.683333>LONGITUDE -57.616667) We reconstruct mid-Pleistocene (marine isotope stages (MISs) 13–18) deepwater hydrography at Ocean Drilling Program Site 1063 (4583m water depth, subtropical North Atlantic) using benthic foraminiferal stable isotope records. These new records complete an ~900 kyr long stratigraphy spanning MISs 8–29 (~250–1030 Ka) when combined with previously published records from Site 1063. The results indicate a change in the circulation regime of the abyssal subtropical North Atlantic during MIS 17. Prior to MIS 17, no significant glacial or interglacial d13C gradients are evident between Site 1063 and the deep South Atlantic. After MIS 17, interglacial intervals at Site 1063 are characterized by d13C values that consistently approach those recorded in the deep North Atlantic. Comparing Site 1063 d13C values to 26 additional published records throughout the entire Atlantic basin supports the idea that this d13C increase is unique to the deep North Atlantic. After MIS 17, the basin-wide influence of higher d13C values suggests an increased relative flux of northern sourced bottom waters during interglacial periods. The timing of northern sourced water influence at Site 1063 is consistent with the timing of a shift in the orientation of the Arctic Front. Thus, this shift may signify a link between the northward penetration of relatively warm, saline surface waters into the Norwegian-Greenland Seas stimulating deep convection. Our findings fit well with the model of Imbrie et al. (1993) for the importance of the Nordic heat pump in establishing strong 100 kyr cyclicity in late Pleistocene glacial cycles. STUDY NOTES: Newly produced stable isotope data from ODP Site 1063 (MIS 13-18) and composite Site 1063 stable isotope records (MIS 8-29) tuned to the LR04 stack of Lisiecki and Raymo (2005) Provided Keywords: Mid-Pleistocene transition, thermohaline circulation, glacial termination NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Poirier, R.K. Investigator : Billups, K. 2015-01-28 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17918 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/poirier2014/poirier2014-1063comp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/poirier2014/poirier2014-1063.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/poirier2014/poirier2014-1063comp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/poirier2014/poirier2014-1063.txt English https://www.ncdc.noaa.gov/paleo/study/17918 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/poirier2014/poirier2014-1063comp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/poirier2014/poirier2014-1063.txt Poirier, R.K. and K. Billups2014The intensification of northern component deepwater formation during the mid-Pleistocene climate transitionPaleoceanography29111046-106110.1002/2014PA002661 START YEAR: 1027150 cal yr BP * END YEAR: 247390 cal yr BP -57.616667 33.683333 -57.616667 33.683333