South Atlantic Bottom Water Temperature, d18O, d13C and Trace Metal Data during the Last Deglaciation Umling, N.E.; Oppo, D.W. Umling, N.E. Oppo, D.W. Other Reconstruction earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (PC-CAM61>LATITUDE -22.52>LONGITUDE -39.9) (KNR159-5-105JPC>LATITUDE -27.35>LONGITUDE -46.63) (KNR159-5-36GGC>LATITUDE -27.5167>LONGITUDE -46.4667) (KNR159-5-90GGC>LATITUDE -27.35>LONGITUDE -46.63) (Atlantic, Eastern Tropical Pacific Coretop Set>LATITUDE >LONGITUDE ) Atlantic Meridional Overturning Circulation (AMOC) disruption during the last deglaciation is hypothesized to have caused large subsurface ocean temperature anomalies, but records from key regions are not available to test this hypothesis, and other possible drivers of warming have not been fully considered. Here, we present the first reliable evidence for subsurface warming in the South Atlantic during Heinrich Stadial 1 (HS1), confirming the link between large-scale heat redistribution and AMOC. Warming extends across the Bølling-Allerød (BA) despite predicted cooling at this time, thus spanning intervals of both weak and strong AMOC indicating another forcing mechanism that may have been previously overlooked. Transient model simulations and quasi-conservative water-mass tracers suggest that reduced northward upper ocean heat transport was responsible for the early deglacial (HS1) accumulation of heat at our shallower (~1,100 m) site. In contrast, the results suggest that warming at our deeper site (~1,900 m) site was dominated by southward advection of North Atlantic mid-depth heat anomalies. During the BA, the demise of ice sheets resulted in oceanographic changes in the North Atlantic that reduced convective heat loss to the atmosphere, causing subsurface warming that overwhelmed the cooling expected from an AMOC reinvigoration. The data and simulations suggest that rising atmospheric CO2 did not contribute significantly to deglacial subsurface warming at our sites. STUDY NOTES: Values that deviated from the mean by greater than 2s, or were an outlier of 3+ replicates were not included in the final trends. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Umling, N.E. Investigator : Oppo, D.W. 2019-06-03 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/26951 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-uvi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-90ggc-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-wuell.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-coretop.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-pachy.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-105jpc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-90ggc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-105jpc-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-uvi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-90ggc-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-wuell.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-coretop.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-pachy.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-105jpc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-90ggc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-105jpc-he.txt English https://www.ncdc.noaa.gov/paleo/study/26951 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-uvi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-90ggc-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-wuell.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-coretop.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-36ggc-pachy.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-105jpc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-pc-cam61-he.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-90ggc-benth.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/umling2019/umling2019-105jpc-he.txt Umling, N.E., D.W. Oppo, P. Chen, J. Yu, Z. Liu, M. Yan, G. Gebbie, D.C. Lund, K.R. Pietro, Z.D. Jin, K.-F. Huang, K.B. Costa, and F.A.L. Toledo2019Atlantic circulation and ice sheet influences on upper South Atlantic temperatures during the last deglaciationPaleoceanography and Paleoclimatology3410.1029/2019PA003558 START YEAR: 57620 cal yr BP * END YEAR: 1663 cal yr BP -87.75 -31.516667 -28.233333 43.366667