Multicentennial Agulhas leakage variability and links to North Atlantic climate during the past 80,000 years

noaa-ocean-17935 Agulhas Bank Stable Isotope and Mg/Ca Data and SST Reconstruction During the Past 80,000 Years Dyez, K.A.; Zahn, R.; Hall, I.R. Agulhas Bank Stable Isotope and Mg/Ca Data and SST Reconstruction During the Past 80,000 Years 2015-01-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17935 Investigator K.A. Dyez Investigator R. Zahn Investigator I.R. Hall earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,null 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 white,null,millimole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,C,null earth science paleoclimate climate reconstructions|paleoceanography delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,anomalized,null,N,Delta delta 18O seawater using Bemis et al.(1998) earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,using Anand et al.(2003); Mg/Ca Globigerinoides ruber white earth science paleoclimate paleoceanography delta 18O,Globigerinoides ruber white,null,per mil VPDB,null,paleoceanography,null,null,N,250-355 µm earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,Globigerinoides ruber white,null,per mil VPDB,null,paleoceanography,null,null,N,250-355 µm earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean reconstruction geoscientificInformation Sea Surface Temperature Reconstruction 80117 cal yr BP 177 cal yr BP Complete -34.71 -34.71 17.338333 17.338333 -2440 -2440 Ocean Atlantic Ocean South Atlantic Ocean MD02-2594>LATITUDE -34.71>LONGITUDE 17.338333 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 Dyez, K.A., R. Zahn, and I.R. Hall 2014 Multicentennial Agulhas leakage variability and links to North Atlantic climate during the past 80,000 years Paleoceanography 29 1238-1248 10.1002/2014PA002698

New high-resolution sea surface temperature (SST) and sea surface salinity (SSS) estimates are presented from the Agulhas Bank slope in the Atlantic sector of the Agulhas Corridor using planktic foraminiferal (Globigerinoides ruber) d18O and Mg/Ca-derived SST. By focusing on the last 80,000 years, this is the first fine-scale Agulhas leakage record that overlaps in time with much of the Greenland ice core record of abrupt climate changes in the North Atlantic region. The multicentennial profiles indicate instances of warm SST and/or increased SSS coincident with Northern Hemisphere cool periods, followed by Northern Hemisphere warming. These periods of enhanced SST and SSS in the Agulhas Corridor occur at the last glacial termination (T1) and during North Atlantic cold episodes associated with Heinrich (H) meltwater events. To a first-order approximation, the timing of maximal salinity events in relation to periods of North Atlantic freshwater pertu rbation is consistent with the concept suggested by climate models that enhanced Agulhas leakage provides for buoyancy compensation and can potentially trigger increased convective activity in the North Atlantic, thereby restoring Atlantic overturning circulation after relatively weak states.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dyez2014/dyez2014.txt Formatted Text File; MD02-2594 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11