Bonaire Basin Planktonic Foraminifera Mg/Ca and d18O Data spanning 50 to 21 kyr BP Parker, A.O.; Schmidt, M.W.; Chang, P. Parker, A.O. Schmidt, M.W. Chang, P. earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,one standard deviation,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (number of samples,null,null,null,null,paleoceanography,null,null,N,Globigerinoides ruber number of analyses) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globorotalia truncatulinoides,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (number of samples,null,null,null,null,paleoceanography,null,null,N,Globorotalia truncatulinoides number of analyses) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globorotalia truncatulinoides,one standard deviation,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (VM12-107>LATITUDE 11.33>LONGITUDE -66.63) The role of Atlantic Meridional Overturning Circulation (AMOC) as the driver of Dansgaard-Oeschger (DO) variability that characterized Marine Isotope Stage 3 (MIS 3) has long been hypothesized. Although there is ample proxy evidence suggesting DO events were robust features of glacial climate, there is little data supporting a link with AMOC. Recently, modeling studies and subsurface temperature reconstructions have suggested that subsurface warming across the tropical North Atlantic can be used to fingerprint a weakened AMOC during the deglacial because a reduction in the strength of the western boundary current allows warm salinity maximum water of the subtropical gyre to enter the deep tropics. To determine if AMOC variability played a role during the DO cycles of MIS 3, we present new, high-resolution Mg/Ca and d18O records spanning 24-52 kyr from the near-surface dwelling planktonic foraminifera Globigerinoides ruber and the lower-thermocline dwelling planktonic foraminifera Globorotalia truncatulinoides in southern Caribbean core VM12-107 (11.33oN, 66.63oW, 1079m depth). Our subsurface Mg/Ca record reveals abrupt increases in Mg/Ca ratios (the largest equal to a 4oC warming) during the interstadial-stadial transition of most DO events during this period. This change is consistent with reconstructions of subsurface warming events associated with cold events across the deglacial using the same core. Additionally, our data support the conclusion reached by a recently published study from the Florida Straits that AMOC did not undergo significant reductions during Heinrich Events 2 and 3. This record presents some of the first high-resolution marine sediment derived evidence for variable AMOC during MIS 3. STUDY NOTES: Provided Keywords: D-O Events, G. ruber, abrupt climate change, Marine Isotope Stage 3, subsurface temperature, Mg/Ca temperature NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Parker, A.O. Investigator : Schmidt, M.W. Investigator : Chang, P. 2016-12-12 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21010 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/parker2015/parker2015.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/parker2015/parker2015.txt English https://www.ncdc.noaa.gov/paleo/study/21010 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/parker2015/parker2015.txt Parker, Andrew O., Matthew W. Schmidt, and Ping Chang2015Tropical North Atlantic Subsurface Warming Events as a Fingerprint for AMOC Variability During Marine Isotope Stage 3Paleoceanography301-1210.1002/2015PA002832 START YEAR: 50000 cal yr BP * END YEAR: 21000 cal yr BP -66.63 11.33 -66.63 11.33