noaa-ocean-8622 Benguela Current GeoB 1023-5 21ka Alkenone SST Reconstruction Kim, J.-H.; Schneider, R.R.; Mueller, P.J.; Wefer, G. Benguela Current GeoB 1023-5 21ka Alkenone SST Reconstruction 2002-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/8622 Investigator J.-H. Kim Investigator R.R. Schneider Investigator P.J. Mueller Investigator G. Wefer earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleoceanography alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography sedimentation rate,null,null,centimeter per kiloyear,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean biomarkers earth science paleoclimate paleocean physical properties earth science paleoclimate paleocean reconstruction earth science paleoclimate paleocean age control geoscientificInformation Sea Surface Temperature Reconstruction 17766 14C yr BP 310 14C yr BP 21013 cal yr BP 363 cal yr BP Complete -17.17 -17.17 11.02 11.02 -1978 -1978 Ocean Atlantic Ocean South Atlantic Ocean GeoB1023-5>LATITUDE -17.17>LONGITUDE 11.02 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 Kim, J.-H., R.R. Schneider, P.J. Mueller, and G. Wefer. 2002. Interhemispheric comparison of deglacial sea-surface temperature patterns in Atlantic eastern boundary currents. Earth and Planetary Science Letters, 194, 383-393.

Sediment core GeoB 1023-5 from the eastern South Atlantic was investigated at high temporal resolution forvariations of sea-surface temperature (SST) during the past 22 kyr, using the alkenone (UK037 ) method. SSTs increased by 3.5°C from about 18°C during the Last Ice Age (21ū2 cal kyr BP) to about 21.5°C at 14.5 cal kyr BP. This warming trend associated with the deglaciation phase was followed by a cooling event with lowest SSTs near 20°C, persisting forabout 1000 years between 13 and 12 cal kyr BP. The SSTs then continued to increase to about 22.5°C at the Holoceneclimatic optimum at 7 cal kyr BP, and decreased again during the Late Holocene to a core-top value of 19.8°C that iscomparable to modern annual mean SST values. When compared with alkenone SST records from the eastern NorthAtlantic, our SST record indicates continuous warming throughout the deglaciation phase in the Benguela Current,while its northern counterpart, the Canary Current, experienced prominent cooling during `Heinrich Event 1' (H1). Onthe other hand, for the time period corresponding to the `Younger Dryas' (YD) cooling event, the Benguela SST recordexhibits a cold-temperature interval that corresponds to that observed in the eastern North Atlantic SST records. Thisobservation suggests that interhemispheric climate response in Atlantic eastern boundary current systems was differentwith respect to the two abrupt climate events associated with Termination I. For the H1, the eastern South Atlantic SSTrecord strongly supports the hypothesis that an `anti-phase' thermal behavior in South Atlantic surface waters wasforced by the slowdown of the North Atlantic Deep Water formation during cold spells in the North Atlantic. Incontrast, the abrupt cooling in the eastern South Atlantic coincident with the YD period was probably induced by morevigorous global atmospheric circulation, enhancing the upwelling intensity in both eastern boundary current systems.This atmospheric control may have overridden any effect caused by changes in thermohaline circulation on the SouthAtlantic SSTs during the YD, which leads to the assumption that the thermohaline circulation was already much closerto its interglacial mode during the YD than during the H1.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kim2002 GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/gb1023-5-tab.txt USA/NOAA DIF Version 9.8.4 2019-03-05 2019-03-05