noaa-ocean-19684 Eastern Equatorial Pacific Stable Isotope and Alkenone Data and SST Reconstruction over the last 25Kyr Bova, S.C.; Herbert, T.D.; Rosenthal, Y.; Kalansky, J.; Altabet, M.A.; Chazen, C.; Mojarro, A.; Zech, J. Eastern Equatorial Pacific Stable Isotope and Alkenone Data and SST Reconstruction over the last 25Kyr 2016-01-19 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19684 Investigator S.C. Bova Investigator T.D. Herbert Investigator Y. Rosenthal Investigator J. Kalansky Investigator M.A. Altabet Investigator C. Chazen Investigator A. Mojarro Investigator J. Zech earth science paleoclimate paleoceanography C37 alkenone,null,null,count,null,paleoceanography,null,gas chromatography - flame ionization detection,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,calibrated using the Muller et al. 1998 equation earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,core name earth science paleoclimate paleoceanography alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,gas chromatography - flame ionization detection,N,null earth science paleoclimate paleoceanography delta 18O,Uvigerina peregrina,null,per mil VPDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,Uvigerina peregrina,null,per mil VPDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleocean biomarkers earth science paleoclimate paleocean oxygen isotopes earth science paleoclimate paleocean carbon isotopes earth science paleoclimate paleocean age control geoscientificInformation Sea Surface Temperature Reconstruction 25831 cal yr BP 1273 cal yr BP Complete -3.986 -1.252167 -89.698 -81.134167 -1023 -370 Ocean Pacific Ocean Eastern Pacific Ocean KNR195-5 CDH26>LATITUDE -3.986>LONGITUDE -81.308667 Ocean Pacific Ocean Eastern Pacific Ocean KNR195-5 GGC43/CDH41>LATITUDE -1.259>LONGITUDE -89.691 Ocean Pacific Ocean Eastern Pacific Ocean KNR195-5 CDH23>LATITUDE -3.749167>LONGITUDE -81.134167 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Samantha C. Bova, Timothy Herbert, Yair Rosenthal, Julie Kalansky, Mark Altabet, Caitlin Chazen, Angel Mojarro, Jana Zech 2015 Paleoceanography 30 11 1407-1424 10.1002/2015PA002816

It is difficult to untangle the mixed influences of high- and low-latitude climate forcing in the eastern equatorial Pacific (EEP). Here we test the hypothesis that the Southern Ocean drove change in the EEP via subsurface intermediate waters during the last deglaciation. We use the d18O signature of benthic foraminifera to reconstruct water density changes during the last 25 kyr at three intermediate water depths (370 m, 600 m, and 1000 m) in the EEP. Carbonate d18O records a combined signature of temperature and salinity and is therefore more closely related to density than temperature or salinity alone. We find that benthic foraminiferal d18O values decreased first in the subsurface, simultaneously with rising temperatures over Antarctica, and propagated up to the surface within ~3 kyr. The early subsurface response initiated a rapid decrease in density stratification over the upper water column as indicated by reduced d18O gradients between surface and intermediate depths. Stratification of the upper water column remained low through the termination, with stratification minima reached during Heinrich Stadial 1 and the Younger Dryas (YD), synchronous with the two-part deglacial rise in atmospheric CO2. Centennial-scale shifts toward heavier d18O signatures at 370 and 600?m during the YD indicate short-lived shifts in the Subantarctic Mode Water/Antarctic Intermediate Water boundary to shallower intermediate depths. We suggest that decreased density gradients during the deglaciation accelerated vertical mixing across the EEP, and potentially the entire South Pacific subtropical gyre, which enhanced CO2 delivery from depth to the surface ocean and atmosphere. STUDY NOTES: Measurement errors- Uk'37: 0.05, C37 Alkenone abundance: 0.1. Keywords: Sea Surface Temperature Reconstruction

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-iso.txt Formatted Text File; KNR195-5 CDH23 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-uk37.txt Formatted Text File; KNR195-5 CDH23 Uk'37 Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-ggc43-cdh41.txt Formatted Text File; KNR195-5 GGC43/CDH41 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-iso.txt Formatted Text File; KNR195-5 CDH26 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-uk37.txt Formatted Text File; KNR195-5 CDH26 Uk'37 Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11