noaa-ocean-22090 Brazil Margin 25,000 Year Benthic Foraminiferal B/Ca and Carbonate Data Lacerra, M.; Lund, D.C.; Yu, J.; Schmittner, A. Brazil Margin 25,000 Year Benthic Foraminiferal B/Ca and Carbonate Data 2017-05-15 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22090 Investigator M. Lacerra Investigator D.C. Lund Investigator J. Yu Investigator A. Schmittner earth science paleoclimate paleoceanography calcium carbonate,sediment,null,percent,null,paleoceanography,smoothed,null,N,3-point running mean earth science paleoclimate paleoceanography number of samples,null,null,count,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 barium/calcium,Cibicidoides wuellerstorfi,one standard deviation,micromole per mole,null,paleoceanography,null,null,N,> 250 um earth science paleoclimate paleoceanography barium/calcium,Cibicidoides wuellerstorfi,null,micromole per mole,null,paleoceanography,null,null,N,> 250 um earth science paleoclimate paleoceanography calcium carbonate,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 geochemistry geoscientificInformation Meridional Overturning Circulation (MOC) 24960 cal yr BP 800 cal yr BP Complete -27.5667 -27.4833 -46.3333 -46.1833 -2082 -1820 Ocean Atlantic Ocean South Atlantic Ocean KNR159-5-33GGC>LATITUDE -27.5667>LONGITUDE -46.1833 Ocean Atlantic Ocean South Atlantic Ocean KNR159-5-78GGC>LATITUDE -27.4833>LONGITUDE -46.3333 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Matthew Lacerra, David Lund, Jimin Yu, and Andreas Schmittner 2017 Paleoceanography 32 8 10.1002/2016PA003081 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2016PA003081

Carbon isotope minima were a ubiquitous feature of the mid‐depth Atlantic during Heinrich Stadial 1 (HS1, 14.5-17.5 kyr BP) and the Younger Dryas (YD, 11.5-12.9 kyr BP), yet their cause remains unclear. Recent evidence indicates that North Atlantic processes triggered the d13C anomalies, with weakening of the Atlantic Meridional Overturning Circulation (AMOC) being the most likely driver. Model simulations suggest that slowing of the AMOC increases the residence time of mid‐depth waters in the Atlantic, resulting in the accumulation of respired carbon. Here we assess ECO2 variability in the South Atlantic using benthic foraminiferal B/Ca, a proxy for [CO32-]. Using replicated high‐resolution B/Ca records from ~2 km water depth on the Brazil Margin, we show that [CO32-] decreased during HS1 and the YD, synchronous with apparent weakening of the AMOC. The [CO32-] response is smaller than in the tropical North Atlantic during HS1, indicating there was a north-south gradient in the [CO32-] signal similar to that for d13C. The implied variability in ECO2 is consistent with model results, suggesting that carbon is temporarily sequestered in the mid‐depth Atlantic during millennial‐scale stadial events. Using a carbon isotope mass balance, we estimate that approximately 75% of the HS1 d13C signal at the Brazil Margin was driven by accumulation of remineralized carbon, highlighting the nonconservative behavior of d13C during the last deglaciation. STUDY NOTES: Barium/Calcium ratio on the benthic foraminifer Cibicidoides wuellerstorfi, plus sediment carbonate content from two sediment cores collected on the Brazil margin, southwest Atlantic Ocean, for the past ~ 25,000 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lacerra2017/lacerra2017ggc33carb.txt Formatted Text Data File; Core KNR159-5-33GGC Carbonate Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lacerra2017/lacerra2017ggc33bca.txt Formatted Text Data File; Core KNR159-5-33GGC B/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lacerra2017/lacerra2017ggc78bca.txt Formatted Text Data File; Core KNR159-5-78GGC B/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lacerra2017/lacerra2017ggc78carb.txt Formatted Text Data File; Core KNR159-5-78GGC Carbonate Data USA/NOAA DIF Version 9.8.4 2019-07-03 2019-07-03