{"NOAAStudyId":"13607","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2012-12-11","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-13607.xml","doi":null,"earliestYearBP":1148000,"earliestYearCE":-1146050,"entryId":"noaa-ocean-13607","funding":[{"fundingAgency":"Ocean Drilling Program","fundingGrant":"Schlanger Fellowship"},{"fundingAgency":"Whole Earth Society","fundingGrant":null}],"investigators":"Rafter, P.A.; Charles, C.D.","mostRecentYearBP":3000,"mostRecentYearCE":-1050,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13607","originalSource":null,"publication":[{"abstract":"There is little agreement among models in predicting the average state of the tropical Pacific when subjected to enhanced greenhouse gas forcing. This uncertainty emphasizes the importance of reconstructing past variability in tropical Pacific climate through episodes of significant and estimable radiative forcing. Thus far, efforts along these lines have concentrated primarily on inferences of sea surface temperature variability from deep-sea sediments. Here we offer a different view of the equatorial Pacific over the past ~1.2 million years (Myr) - before and after the mid-Pleistocene shift in the structure of ice ages. The zonal gradient in the nitrogen isotopic composition of sediment across the equatorial Pacific reflects nutrient delivery to the surface and, by extension, ocean dynamical properties. Over the last ~1.2 Myr, the variability of eastern equatorial Pacific nutrient upwelling (inferred from relative nitrate utilization) was highly correlated with local seasonal insolation. By contrast, nitrate utilization was insensitive to the 100,000 year cycle that dominated many other aspects of the Pleistocene ice ages, including greenhouse gas concentrations. A strong linear relationship between relative nitrate utilization and seasonal insolation over the past ~1 million years suggests a predictable response of one primary determinant of tropical Pacific climate change. \r\n","author":null,"citation":"Patrick A. Rafter and Christopher D. Charles. 2012. \r\nPleistocene equatorial Pacific dynamics inferred from the zonal asymmetry in sedimentary nitrogen isotopes.\r\nPaleoceanography, Vol. 27, PA3102. \r\nDOI: 10.1029/2012PA002367","edition":null,"identifier":{"id":"10.1029/2012PA002367","type":"doi","url":"http://dx.doi.org/10.1029/2012PA002367"},"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2012,"reportNumber":null,"title":"Pleistocene equatorial Pacific dynamics inferred from the zonal asymmetry in sedimentary nitrogen isotopes","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"19108","geo":{"geoType":"Feature","geometry":{"coordinates":[".18","-110.52"],"type":"POINT"},"properties":{"easternmostLongitude":"-110.52","maxElevationMeters":"-3839","minElevationMeters":"-3839","northernmostLatitude":"0.18","southernmostLatitude":"0.18","westernmostLongitude":"-110.52"}},"locationName":"Ocean>Pacific Ocean>North Pacific 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