Eastern Equatorial Pacific(MD02-2529) 90KYr SST and SSS Reconstructions Leduc, G.; Vidal, L.; Tachikawa, K.; Rostek, F.; Sonzogni, C.; Beaufort, L.; Bard, E. Leduc, G. Vidal, L. Tachikawa, K. Rostek, F. Sonzogni, C. Beaufort, L. Bard, E. Other Hydroclimate Reconstruction Sea Surface Temperature Reconstruction earth science/paleoclimate/climate reconstructions|paleoceanography (delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,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 VSMOW,null,climate reconstructions|paleoceanography,corrected,null,N,corrected for ice volume) 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/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (Globigerinoides ruber,null,null,microgram,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 (magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,null,N,null) 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 earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (MD02-2529>LATITUDE 8.2>LONGITUDE -84.12) Moisture transport from the Atlantic to the Pacific ocean across Central America leads to relatively high salinities in the North Atlantic Ocean and contributes to the formation of North Atlantic Deep Water. This deep water formation varied strongly between Dansgaard/Oeschger interstadials and Heinrich eventsŋmillennial-scale abrupt warm and cold events, respectively, during the last glacial period. Increases in the moisture transport across Central America have been proposed to coincide with northerly shifts of the Intertropical Convergence Zone and with Dansgaard/Oeschger interstadials, with opposite changes for Heinrich events. Here we reconstruct sea surface salinities in the eastern equatorial Pacific Ocean over the past 90,000 years by comparing palaeotemperature estimates from alkenones and Mg/Ca ratios with foraminiferal oxygen isotope ratios that vary with both temperature and salinity. We detect millennial-scale fluctuations of sea surface salinities in the eastern equatorial Pacific Ocean of up to two to four practical salinity units. High salinities are associated with the southward migration of the tropical Atlantic Intertropical Convergence Zone, coinciding with Heinrich events and with Greenland stadials. The amplitudes of these salinity variations are significantly larger on the Pacific side of the Panama isthmus, as inferred from a comparison of our data with a palaeoclimate record from the Caribbean basin. We conclude that millennial-scale fluctuations of moisture transport constitute an important feedback mechanism for abrupt climate changes, modulating the North Atlantic freshwater budget and hence North Atlantic Deep Water formation. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Leduc, G. Investigator : Vidal, L. Investigator : Tachikawa, K. Investigator : Rostek, F. Investigator : Sonzogni, C. Investigator : Beaufort, L. Investigator : Bard, E. 2007-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6407 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leduc2007 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/md2-2529-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leduc2007 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/md2-2529-tab.txt English https://www.ncdc.noaa.gov/paleo/study/6407 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/leduc2007 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/md2-2529-tab.txt Leduc, G., L. Vidal, K. Tachikawa, F. Rostek, C. Sonzogni, L. Beaufort, and E. Bard. 2007. Moisture transport across Central America as a positive feedback on abrupt climatic changes. Nature, 445, 908-911. START YEAR: 89334 cal yr BP * END YEAR: 112 cal yr BP -84.12 8.2 -84.12 8.2