Brazil Margin LGM-Holocene Benthic Stable Isotope Data Hoffman, J.L.; Lund, D.C. Hoffman, J.L. Lund, D.C. Meridional Overturning Circulation (MOC) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,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 (KNR159-5-42JPC>LATITUDE -27.7667>LONGITUDE -46.0333) (KNR159-5-120GGC>LATITUDE -28.5833>LONGITUDE -45.2333) (KNR159-5-125GGC>LATITUDE -29.5333>LONGITUDE -45.0833) (KNR159-5-54GGC>LATITUDE -29.5333>LONGITUDE -43.3333) (KNR159-5-22GGC>LATITUDE -29.7833>LONGITUDE -43.5833) Stable isotope tracer budget results suggest the transport to vertical diffusivity ratio for Antarctic Bottom Water (AABW) in the Atlantic was higher at the Last Glacial Maximum (LGM). Reduced mixing across the upper boundary of AABW is consistent with movement of this surface away from the seafloor and may be a factor in sequestering CO2 in the abyssal Atlantic. Two key unknowns in the budget are the isotopic composition of AABW and the spatial representativeness of isolated vertical profiles of d18O and d13C. Due to a lack of core material below 3 km water depth, Lund et al. (2011) based their Holocene budget on water column data and their LGM budget on extrapolation of isotopic trends from shallower cores. Here we determine d18O and d13C for AABW using new isotopic records from 3 to 4 km water depth at the Brazil Margin. The core top data yield tracer budget parameters consistent with water column data in the broader Southwest Atlantic. At the LGM, benthic d18O reaches 4.9‰ at 4 km water depth, the highest LGM d18O value in the published literature. The corresponding d13C of -0.2‰ is less depleted than expected and >0.5‰ greater than d13C in the Southeast Atlantic. Our Peclet number estimates suggest d13C acted conservatively during both the Holocene and LGM. Both d18O and d13C imply the transport to vertical diffusivity ratio for AABW was an order of magnitude larger during the LGM, due to enhanced AABW transport or reduced mixing across its upper boundary. STUDY NOTES: The files include age model and stable isotopic data for KNR159-5-42JPC, 125GGC, 22GGC, and 54GGC. Only stable isotopic data are available for 120GGC. All calendar ages are based on the MARINE09 calibration curve assuming a deltaR of 0±200 years (1sigma For details see Hoffman and Lund (2012). In the stable isotopic data benthic d13C and benthic d18O are reported per mil VPDB. Isotopic measurements were based on individual tests of Cibicidoides spp. Bioturbated samples are noted where appropriate. Note that the isotopic data for KNR159-5-42JPC were initially published by Curry and Oppo (2005). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Hoffman, J.L. Investigator : Lund, D.C. 2012-11-06 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13498 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012jpc42.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc125.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc120.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc54.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc22.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012jpc42.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc125.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc120.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc54.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc22.txt English https://www.ncdc.noaa.gov/paleo/study/13498 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012jpc42.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc125.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc120.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc54.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc22.txt Hoffman, J.L. and D.C. Lund. 2012. Refining the stable isotope budget for Antarctic Bottom Water: New foraminiferal data from the abyssal southwest Atlantic. Paleoceanography, 27, PA1213. doi: 10.1029/2011PA002216 START YEAR: 22935 cal yr BP * END YEAR: 330 cal yr BP -46.0333 -29.7833 -43.3333 -27.7667