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. Bova, S.C. Herbert, T.D. Rosenthal, Y. Kalansky, J. Altabet, M.A. Chazen, C. Mojarro, A. Zech, J. Sea Surface Temperature Reconstruction 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 earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (KNR195-5 CDH26>LATITUDE -3.986>LONGITUDE -81.308667) (KNR195-5 GGC43/CDH41>LATITUDE -1.259>LONGITUDE -89.691) (KNR195-5 CDH23>LATITUDE -3.749167>LONGITUDE -81.134167) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Bova, S.C. Investigator : Herbert, T.D. Investigator : Rosenthal, Y. Investigator : Kalansky, J. Investigator : Altabet, M.A. Investigator : Chazen, C. Investigator : Mojarro, A. Investigator : Zech, J. 2016-01-19 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/19684 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-uk37.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-ggc43-cdh41.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-uk37.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-uk37.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-ggc43-cdh41.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-uk37.txt English https://www.ncdc.noaa.gov/paleo/study/19684 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh23-uk37.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-ggc43-cdh41.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bova2015/bova2015-cdh26-uk37.txt Samantha C. Bova, Timothy Herbert, Yair Rosenthal, Julie Kalansky, Mark Altabet, Caitlin Chazen, Angel Mojarro, Jana Zech2015Links between eastern equatorial Pacific stratification and atmospheric CO2 rise during the last deglaciationPaleoceanography30111407-142410.1002/2015PA002816 START YEAR: 25831 cal yr BP * END YEAR: 1273 cal yr BP -89.698 -3.986 -81.134167 -1.252167