Galapagos TR163-22 Foraminiferal d18O and Mg/Ca Data and SST Reconstruction Lea, D.W.; Pak, D.K.; Belanger, C.L.; Spero, H.J.; Hall, M.A.; Shackleton, N.J. Lea, D.W. Pak, D.K. Belanger, C.L. Spero, H.J. Hall, M.A. Shackleton, N.J. Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerinoides ruber,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil PDB,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,Uvigerina senticosa) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globigerinoides ruber,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (TR163-22>LATITUDE .52>LONGITUDE -92.4) Records of planktonic and benthic foraminiferal d18O and planktonic Mg/Ca from core TR163-22, just northwest of the Galápagos Islands, reveal a detailed (250-450 year resolution) climate history of the region over the last 135 thousand years (kyr). Sea surface temperatures (SSTs), reconstructed from G. ruber Mg/Ca, averaged 24.3ą0.4 °C during the Holocene, 22.6ą0.6 °C during marine isotope stage (MIS) 2, 3 and 4, and 26.0ą0.9 °C during MIS 5e. Changes in SST lead changes in both planktonic and benthic d18O by an average ~3 kyr, suggesting that SST changes in this region predated continental ice volume changes. Changes in SST display clear millennial scale variability, especially in marine isotope stage 3, with behavior somewhat similar to Antarctic proxy air temperature and South Pacific SST records. Removal of the temperature component from the planktonic d18O record demonstrates that glacial-interglacial d18O-water changes at this site were 1.0ą0.2 per mil, similar to estimates for mean ocean shifts, implying that salinity changes due to regional hydrological variation between the Last Glacial Maximum and Holocene in the Galápagos region were minimal. Comparison between the TR163-22 SST record and an SST record from core TR163-19 North of the Equatorial Front reveals a largely similar broad-scale climate history, suggesting that changes in the Galápagos region were caused by large scale forcing rather than by local or regional dynamical changes. Changes in atmospheric greenhouse forcing are the most plausible explanation for the observed large-scale climate changes in the eastern equatorial Pacific. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lea, D.W. Investigator : Pak, D.K. Investigator : Belanger, C.L. Investigator : Spero, H.J. Investigator : Hall, M.A. Investigator : Shackleton, N.J. 2006-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9039 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/tr163-22-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lea2006 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/tr163-22-sytr-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/tr163-22-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lea2006 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/tr163-22-sytr-tab.txt English https://www.ncdc.noaa.gov/paleo/study/9039 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/tr163-22-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lea2006 https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/tr163-22-sytr-tab.txt Lea, D.W., D.K. Pak, C.L. Belanger, H.J. Spero, M.A. Hall, and N.J. Shackleton. 2006. Paleoclimate history of Galápagos surface waters over the last 135,000 yr. Quaternary Science Reviews, 25(11-12), 1152-1167. doi:10.1016/j.quascirev.2005.11.010. START YEAR: 135000 cal yr BP * END YEAR: 1200 cal yr BP -92.4 .52 -92.4 .52