noaa-ocean-25670 Alkenone SST reconstructions from the eastern tropical Pacific 0-30 ky BP Koutavas, A.; Sachs, J.P. Alkenone SST reconstructions from the eastern tropical Pacific 0-30 ky BP 2018-11-22 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25670 Investigator A. Koutavas Investigator J.P. Sachs earth science paleoclimate paleocean biomarkers earth science paleoclimate paleocean reconstruction geoscientificInformation Sea Surface Temperature Reconstruction 29840 cal yr BP 790 cal yr BP Complete -3.38 -.47 -89.68 -82.07 -3091 -617 Ocean Pacific Ocean South Pacific Ocean V19-27>LATITUDE -.47>LONGITUDE -82.07 Ocean Pacific Ocean South Pacific Ocean RC11-238>LATITUDE -1.52>LONGITUDE -85.82 Ocean Pacific Ocean South Pacific Ocean V21-30>LATITUDE -1.22>LONGITUDE -89.68 Ocean Pacific Ocean Eastern Pacific Ocean Equatorial Equatorial Pacific Cold Tongue Region>LATITUDE >LONGITUDE Ocean Pacific Ocean South Pacific Ocean V19-30>LATITUDE -3>LONGITUDE -83 Ocean Pacific Ocean South Pacific Ocean V19-28>LATITUDE -2.37>LONGITUDE -84.65 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 Koutavas, A., and J.P. Sachs 2008 Paleoceanography 23 PA4205 10.1029/2008PA001593

The equatorial cold tongue (ECT) of the eastern Pacific is the most dynamic ocean region in the world's tropics and sets the tempo for global climate anomalies arising from El Niño–Southern Oscillation (ENSO) events. This region's deglaciation history and relationship with north and south polar climates remains poorly understood, impeding integration of tropical Pacific ocean-atmosphere dynamics and ENSO variability in our understanding of glacial cycles. Here we present alkenone reconstructions of sea surface temperature (SST) across the last glacial termination from five ECT cores east of the Galapagos Islands. A composite index of SST based on these demonstrates strong temporal affinity with the two-step deglaciation of the Northern Hemisphere, composed of two distinct warming steps at the beginning of the Bölling and the end of the Younger Dryas intervals. Within dating uncertainty, warming in the ECT began in phase with the Bölling excursion, was followed by a 2–3 ka plateau, and resumed with a second pulse at the end of the Younger Dryas. On the basis of our reconstructions, about two thirds of the warming materialized at or after the end of the Younger Dryas, implying a marked delay in the region's response to deglaciation. The results challenge the prevailing paradigm that ECT deglacial history conforms to an Antarctic timing, commonly attributed to advection from the Southern Ocean through an interior oceanic link, or to synchronous response of both regions to CO2 forcing. Our results emphasize instead the role of dynamical adjustments linked to Northern Hemisphere processes, most likely transmitted through the atmosphere. STUDY NOTES: Provided Keywords: Eastern Equatorial Pacific, alkenones

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/koutavas2008/koutavas2008-ect.txt NOAA Template File; Equatorial Cold Tongue SST Index Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/koutavas2008/koutavas2008-v19-30.txt NOAA Template File; V19-30 Alkenone and SST Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/koutavas2008/koutavas2008-v21-30.txt NOAA Template File; V21-30 Alkenone and SST Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/koutavas2008/koutavas2008-v19-27.txt NOAA Template File; V19-27 Alkenone and SST Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/koutavas2008/koutavas2008-v19-28.txt NOAA Template File; V19-28 Alkenone and SST Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/koutavas2008/koutavas2008-rc11-238.txt NOAA Template File; RC11-238 Alkenone and SST Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11