Atlantic Ocean Pliocene Planktonic and Benthic d18O and Mg/Ca Data Karas, C.; Nürnberg, D.; Bahr, A.; Groeneveld, J.; Herrle, J.O.; Tiedemann, R.; deMenocal, P.B. Karas, C. Nürnberg, D. Bahr, A. Groeneveld, J. Herrle, J.O. Tiedemann, R. deMenocal, P.B. earth science/paleoclimate/paleoceanography (delta 18O,Globigerina bulloides,null,per mil VPDB,null,paleoceanography,null,null,N,215-315um) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Trilobatus sacculifer without sac,null,per mil VPDB,null,paleoceanography,null,null,N,315-355um) earth science/paleoclimate/paleoceanography (magnesium/calcium,Trilobatus sacculifer without sac,null,millimole per mole,null,paleoceanography,null,null,N,315-355um) earth science/paleoclimate/paleoceanography (magnesium/calcium,Globigerina bulloides,null,millimole per mole,null,paleoceanography,null,null,N,215-315um) earth science/paleoclimate/paleoceanography (age,null,null,million years ago,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (DSDP 552A>LATITUDE 56.042667>LONGITUDE -23.231333) (DSDP516A>LATITUDE -30.2833>LONGITUDE -35.2833) Tectonically induced changes in oceanic seaways had profound effects on global and regional climate during the Late Neogene. The constriction of the Central American Seaway reached a critical threshold during the early Pliocene ~4.8-4 million years (Ma) ago. Model simulations indicate the strengthening of the Atlantic Meridional Overturning Circulation (AMOC) with a signature warming response in the Northern Hemisphere and cooling in the Southern Hemisphere. Subsequently, between ~4-3 Ma, the constriction of the Indonesian Seaway impacted regional climate and might have accelerated the Northern Hemisphere Glaciation. We here present Pliocene Atlantic interhemispheric sea surface temperature and salinity gradients (deduced from foraminiferal Mg/Ca and stable oxygen isotopes, d18O) in combination with a recently published benthic stable carbon isotope (d13C) record from the southernmost extent of North Atlantic Deep Water to reconstruct gateway-related changes in the AMOC mode. After an early reduction of the AMOC at ~5.3 Ma, we show in agreement with model simulations of the impacts of Central American Seaway closure a strengthened AMOC with a global climate signature. During ~3.8-3 Ma, we suggest a weakening of the AMOC in line with the global cooling trend, with possible contributions from the constriction of the Indonesian Seaway. STUDY NOTES: Combined planktonic foraminiferal Mg/Ca and d18O data, benthic d18O data and foraminiferal test weights from Deep Sea Drilling Project (DSDP) sites 516A and 552A (South and North Atlantic Oceans). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Karas, C. Investigator : Nürnberg, D. Investigator : Bahr, A. Investigator : Groeneveld, J. Investigator : Herrle, J.O. Investigator : Tiedemann, R. Investigator : deMenocal, P.B. 2017-01-04 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21150 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/karas2017/karas2017dsdp516a.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/karas2017/karas2017dsdp552a.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/karas2017/karas2017dsdp516a.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/karas2017/karas2017dsdp552a.txt English https://www.ncdc.noaa.gov/paleo/study/21150 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/karas2017/karas2017dsdp516a.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/karas2017/karas2017dsdp552a.txt Cyrus Karas, Dirk Nürnberg, André Bahr, Jeroen Groeneveld, Jens O. Herrle, Ralf Tiedemann and Peter B. deMenocal2017Pliocene oceanic seaways and global climateScientific Reports3982710.1038/srep39842http://www.nature.com/articles/srep39842 START YEAR: 6002000 cal yr BP * END YEAR: 2786000 cal yr BP -35.2833 -30.2833 -23.231333 56.042667