noaa-ocean-25310 Southwest Pacific Ocean alkenone unstaturation ratio from the Pliocene to the present Fedorov, A.V.; Burls, N.J.; Lawrence, K.T.; Peterson, L.C. Southwest Pacific Ocean alkenone unstaturation ratio from the Pliocene to the present 2018-10-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25310 Investigator A.V. Fedorov Investigator N.J. Burls Investigator K.T. Lawrence Investigator L.C. Peterson earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,C,null earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,composite depth earth science paleoclimate paleoceanography depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,million years ago,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography alkenone unsaturation index Uk37 prime,sediment,null,dimensionless,null,paleoceanography,null,gas chromatography - flame ionization detection,N,null earth science paleoclimate paleoceanography depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean biomarkers geoscientificInformation 5012000 cal yr BP 42000 cal yr BP Complete -42.55 -42.55 -178.166 -178.166 -1370 -1370 Ocean Pacific Ocean South Pacific Ocean ODP 1125>LATITUDE -42.55>LONGITUDE -178.166 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

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Boulder CO 80305-3328 USA online ASCII Fedorov, A.V., N.J. Burls, K.T. Lawrence, and L.C. Peterson 2015 Nature Geoscience 8 975-980 10.1038/ngeo2577

The climate of the tropics and surrounding regions is defined by pronounced zonal (east-west) and meridional (equator to mid-latitudes) gradients in sea surface temperature. These gradients control zonal and meridional atmospheric circulations, and thus the Earth's climate. Global cooling over the past five million years, since the early Pliocene epoch, was accompanied by the gradual strengthening of these temperature gradients. Here we use records from the Atlantic and Pacific oceans, including a new alkenone palaeotemperature record from the South Pacific, to reconstruct changes in zonal and meridional sea surface temperature gradients since the Pliocene, and assess their connection using a comprehensive climate model. We find that the reconstructed zonal and meridional temperature gradients vary coherently over this time frame, showing a one-to-one relationship between their changes. In our model simulations, we systematically reduce the meridional sea surface temperature gradient by modifying the latitudinal distribution of cloud albedo or atmospheric CO2concentration. The simulated zonal temperature gradient in the equatorial Pacific adjusts proportionally. These experiments and idealized modelling indicate that the meridional temperature gradient controls upper-ocean stratification in the tropics, which in turn controls the zonal gradient along the equator, as well as heat export from the tropical oceans. We conclude that this tight linkage between the two sea surface temperature gradients posits a fundamental constraint on both past and future climates. STUDY NOTES: Provided Keywords: paleoclimate, meridional temperature gradient, sea surface temperature, Pliocene, Pleistocene.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/fedorov2015/fedorov2015-odp1125.txt NOAA Template File; ODP 1125 Uk'37 Data USA/NOAA DIF Version 9.8.4 2019-03-04 2019-03-04