noaa-ocean-19481 Florida Straits 35 - 20 KYrBP Mg/Ca SST and d18Osw Reconstructions Them, T.R. II; Schmidt, M.W.; Lynch-Stieglitz, J. Florida Straits 35 - 20 KYrBP Mg/Ca SST and d18Osw Reconstructions 2015-11-20 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19481 Investigator T.R. II Them Investigator M.W. Schmidt Investigator J. Lynch-Stieglitz earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Anand et al. 2003; G.ruber Mg/Ca earth science paleoclimate climate reconstructions|paleoceanography delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,corrected,null,N,corrected for ice volume 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,null,millimole per mole,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null earth science paleoclimate paleoceanography Neogloboquadrina dutertrei,sediment,null,count per gram,null,paleoceanography,null,null,N,manual count earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean reconstruction geoscientificInformation Last Glacial Maximum Sea Surface Temperature Reconstruction 34492 cal yr BP 20254 cal yr BP Complete 24.326833 24.326833 -83.252333 -83.252333 -546 -546 Ocean Atlantic Ocean North Atlantic Ocean Gulf Of Mexico KNR166-2-26JPC>LATITUDE 24.326833>LONGITUDE -83.252333 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 Them, T.R. II, Schmidt, M.W. and Lynch-Stieglitz, J. 2015 Earth and Planetary Science Letters 427 47-56 10.1016/j.epsl.2015.06.062 http://www.sciencedirect.com/science/article/pii/S0012821X15004252

Abrupt, millennial-scale climate oscillations, known as Dansgaard-Oeschger (D-O) cycles, characterized the climate system of the last glacial period. Although proxy evidence shows that D-O cycles resulted in large-scale changes in atmospheric circulation patterns around the planet, an understanding of how Atlantic Meridional Overturning Circulation (AMOC) varied across these events remains unclear. Here, we take advantage of the fact that both tropical atmospheric circulation changes corresponding to north-south shifts in the Intertropical Convergence Zone (ITCZ) and large-scale changes in ocean circulation associated with AMOC variability can be reconstructed in the same sediment core from the Florida Straits to examine the relationship between atmospheric and ocean circulation changes across D-O events. To reconstruct surface water conditions, Mg/Ca-paleothermometry and stable isotope measurements were combined on the planktonic foraminifera Globigerinoides ruber (white variety) from sediment core KNR166-2 JPC26 (24 19.61'N, 83 15.14'W; 546 m depth) to reconstruct a high-resolution record of sea surface temperature and d18OSEAWATER (a proxy for upper mixed layer salinity) during Marine Isotope Stages (MIS) 2 and 3 from 20 - 35 ka BP. As an additional proxy for upper water column salinity change, we also generate a faunal abundance record of the salinity-sensitive planktonic foraminifera Neogloboquadrina dutertrei. Our results suggest that rapid reductions in sea surface salinity occurred at the onset of D-O interstadials, while stadials are characterized by increased surface salinities. The most likely cause of these salinity changes was variation in the strength and position of the ITCZ across D-O events. Finally, we examine the relationship between millennial-scale atmospheric circulation changes recorded in the planktonic records and ocean circulation changes inferred from the benthic d18O record from our core. Our results provide some of the first evidence that AMOC strength did vary across at least one of the millennial-scale D-O cycles of MIS 3. STUDY NOTES: Planktonic foraminiferal Mg/Ca and abundance data plus reconstructed SST and d18O-seawater from a Florida Straits sediment core covering the Last Glacial Maximum and Marine Isotope Stage 3 (35 - 20 KYrBP).

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/them2015/them2015.txt Data File; Florida Straits Mg/Ca SST and d18Osw Reconstructions USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11