{"xmlId":"76732","NOAAStudyId":"35174","studyName":"Earth Orbital 100 Million Year Precession and Tilt Solutions","doi":"https://doi.org/10.25921/wmfq-hx24","uuid":"15a24346-1e9e-4ab0-a184-e7b9bdeb4573","dataPublisher":"NOAA","contactInfo":{"type":"CONTACT INFORMATION","shortName":"DOC/NOAA/NESDIS/NCEI","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","address":"325 Broadway, E/NE31","city":"Boulder","state":"CO","postalCode":"80305-3328","country":"USA","dataCenterUrl":"https://www.ncei.noaa.gov/products/paleoclimatology","email":"paleo@noaa.gov","phone":"828-271-4800","fax":null,"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."},"dataType":"CLIMATE FORCING","investigators":"Zeebe, R.E.; Lourens, L.J.","investigatorDetails":[{"firstName":"Richard","lastName":"Zeebe","initials":"R.E.","orcId":"0000-0003-0806-8387"},{"firstName":"Lucas","lastName":"Lourens","initials":"L.J.","orcId":"0000-0002-3815-7770"}],"version":"1.0","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE20-01022, OCE20-34660"},{"fundingAgency":"Heising-Simons Foundation","fundingGrant":"2021-2800"}],"studyNotes":"Pre-computed Precession-Tilt solutions for the past 100 million years from the ZB18a model (Zeebe and Lourens, Science, 2019).","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/35174","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-forcing-35174.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-forcing-35174.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/climate-forcing","studyCode":null,"scienceKeywords":["Milankovitch"],"reconstruction":"N","contributionDate":"2022-01-10","entryId":"noaa-forcing-35174","earliestYearBP":100000000,"mostRecentYearBP":0,"earliestYearCE":-99998050,"mostRecentYearCE":1950,"publication":[{"author":{"name":"Richard E. Zeebe and Lucas J. Lourens"},"pubYear":2022,"title":"A deep-time dating tool for paleo-applications utilizing obliquity and precession cycles: The role of dynamical ellipticity and tidal dissipation","journal":"Paleoceanography and Paleoclimatology","volume":"37","edition":null,"issue":"2","pages":null,"reportNumber":null,"citation":"Richard E. Zeebe and Lucas J. Lourens. 2022. A deep-time dating tool for paleo-applications utilizing obliquity and precession cycles: The role of dynamical ellipticity and tidal dissipation. Paleoceanography and Paleoclimatology, 37(2). doi: 10.1029/2021PA004349","type":"publication","identifier":{"type":"doi","id":"10.1029/2021PA004349","url":"http://dx.doi.org/10.1029/2021PA004349"},"abstract":"Pre-Pleistocene age models used in paleoceanography and paleoclimatology often rely on the imprint of astronomically calculated cycles of eccentricity and other solar system frequencies in sedimentary records (405, 173, and 100kyr). However, use of obliquity and precession cycles (at present ~41 and ~20 kyr) remains challenging for these periods, mostly due to past changes in Earth's dynamical ellipticity (Ed, gravitational shape) and tidal dissipation (Td, slowdown of Earth's rotation), which affect the astronomical calculations. Here we present a dating method for deep-time records by integrating Ed and Td into astrochronology. The key to our approach is the combination of constraints on Td (and thus indirectly on Ed) with age model optimization based on solar system frequencies, plus tuning to obliquity/precession frequencies, while varying Td and Ed. Importantly, we target deep-time intervals where Td\\ shows significant effects but high-quality sedimentary records are available (early Cenozoic). We include a quickstart guide to our approach and make our code and pre-computed solutions freely available for users. To demonstrate the practical utility of our approach, we apply our tool to two case studies using deep-sea records from the early and middle Eocene. Our results confirm very accurate chronologies of sedimentary records from the early Eocene (~56-54Ma) but suggest significant improvement for the middle Eocene (~40-39Ma). For the early Eocene, our method provides absolute geologic ages with an estimated uncertainty of +-20 to 40kyr, which is smaller than or equal to typical uncertainties from recent radiometric Ar/Ar dating.","pubRank":"1"}],"site":[{"NOAASiteId":"22723","siteName":"Global","siteCode":null,"mappable":"N","locationName":"Geographic Region>Global","geo":{"geoType":"Feature","geometry":{"type":"POLYGON","coordinates":["-90","90","-180","180"]},"properties":{"southernmostLatitude":"-90","northernmostLatitude":"90","westernmostLongitude":"-180","easternmostLongitude":"180","minElevationMeters":null,"maxElevationMeters":null}},"paleoData":[{"dataTableName":"Zeebe2022orbital","NOAADataTableId":"47908","earliestYear":100000000,"mostRecentYear":0,"timeUnit":"cal yr BP","earliestYearBP":100000000,"mostRecentYearBP":0,"earliestYearCE":-99998050,"mostRecentYearCE":1950,"coreLengthMeters":null,"dataTableNotes":null,"species":[],"dataFile":[{"fileUrl":"https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/orbital_variations/zeebe2022/","urlDescription":"Data Folder","linkText":"100 Million Year Precession and Tilt Solutions","variables":[{"cvDataType":"CLIMATE FORCING","cvWhat":"age variable>age","cvMaterial":null,"cvError":null,"cvUnit":"time unit>age unit>calendar kiloyear before present","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":null,"cvFormat":"Numeric","cvShortName":"time_kyr"},{"cvDataType":"CLIMATE FORCING","cvWhat":"earth system variable>forcing variable>orbital parameter","cvMaterial":null,"cvError":null,"cvUnit":"angle unit>radian","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"obliquity","cvFormat":"Numeric","cvShortName":"obliquity_rad"},{"cvDataType":"CLIMATE FORCING","cvWhat":"earth system variable>forcing variable>orbital parameter","cvMaterial":null,"cvError":null,"cvUnit":"angle unit>radian","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"precession from ECLIPJ2000","cvFormat":"Numeric","cvShortName":"precession_rad"},{"cvDataType":"CLIMATE FORCING","cvWhat":"earth system variable>forcing variable>orbital parameter","cvMaterial":null,"cvError":null,"cvUnit":"angle unit>radian","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"climatic precession; e*sin(\\varpi*)\\varpi* = longitude of perihelion from moving equinox. ","cvFormat":"Numeric","cvShortName":"climatic_precession"}],"NOAAKeywords":["earth science>paleoclimate>climate forcing>other"]},{"fileUrl":"https://www.ncei.noaa.gov/pub/data/paleo/climate_forcing/orbital_variations/zeebe2022/readme-zeebe2022.txt","urlDescription":"Data Description","linkText":"100 Million Year Precession and Tilt Solutions Readme File","variables":[],"NOAAKeywords":["earth science>paleoclimate>climate forcing>other"]}]}]}],"reference":{"pastThesaurusSkos":"https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf","pastThesaurusExplorer":"https://www.ncei.noaa.gov/access/paleo-search/cvterms","gcmdKeywordThesaurus":"https://earthdata.nasa.gov/earth-observation-data/find-data/idn/gcmd-keywords"},"dataLicenseDescription":null,"dataLicenseUrl":null}