{"xmlId":"70530","NOAAStudyId":"28650","studyName":"T Lake, Palau Holocene Dinosterol H-Isotopic Composition and Abundance","doi":"https://doi.org/10.25921/htwe-rx77","uuid":"7494c122-7586-48cb-b58a-49e41bc12d3d","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":"PALEOLIMNOLOGY","investigators":"Sachs, J.P.; Blois, J.L.; McGee, T.; Wolhowe, M.D.; Haberle, S.G.; Clark, G.; Atahan, P.","investigatorDetails":[{"firstName":"Julian","lastName":"Sachs","initials":"J.P.","orcId":"0000-0002-6247-9286"},{"firstName":"Jessica","lastName":"Blois","initials":"J.L.","orcId":"0000-0003-4048-177X"},{"firstName":"Tessa","lastName":"McGee","initials":"T.","orcId":null},{"firstName":"Matthew","lastName":"Wolhowe","initials":"M.D.","orcId":"0000-0003-4505-5198"},{"firstName":"Simon","lastName":"Haberle","initials":"S.G.","orcId":null},{"firstName":"Geoffrey","lastName":"Clark","initials":"G.","orcId":"0000-0002-9055-655X"},{"firstName":"Pia","lastName":"Atahan","initials":"P.","orcId":null}],"version":"1.0","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"OCE-1241247, OCE-1241255"},{"fundingAgency":"Australian Research Council (ARC)","fundingGrant":"DP120103202"}],"studyNotes":"Algal biomarker isotopic record from T Lake, Ngeruktabel, Palau, interpreted as indicative of rainfall across the Holocene","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/28650","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-28650.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-lake-28650.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/lake","studyCode":null,"scienceKeywords":null,"reconstruction":"N","contributionDate":"2020-01-03","entryId":"noaa-lake-28650","earliestYearBP":10432,"mostRecentYearBP":117,"earliestYearCE":-8482,"mostRecentYearCE":1833,"publication":[{"author":{"name":"J.P. Sachs, J.L. Blois, T. McGee, M. Wolhowe, S. Haberle, G. Clark, P. Atahan"},"pubYear":2018,"title":"Southward Shift of the Pacific ITCZ During the Holocene","journal":"Paleoceanography and Paleoclimatology","volume":"33","edition":null,"issue":"12","pages":"1383-1395","reportNumber":null,"citation":"J.P. Sachs, J.L. Blois, T. McGee, M. Wolhowe, S. Haberle, G. Clark, P. Atahan. 2018. Southward Shift of the Pacific ITCZ During the Holocene. Paleoceanography and Paleoclimatology, 33(12), 1383-1395. doi: 10.1029/2018PA003469","type":"publication","identifier":{"type":"doi","id":"10.1029/2018PA003469","url":"http://dx.doi.org/10.1029/2018PA003469"},"abstract":"The Holocene (0-11.7 ka BP) appears warm and stable in ice core and global temperature reconstructions as well as in transient climate simulations. This seeming quiescence of Earth's climate belies large secular changes in seasonal and zonal mean radiation receipts resulting from variations in orbital precession and obliquity. Here we show that the tropical Pacific, a key mediator of global climate, underwent a profound climatic shift during the Holocene. Hydrogen isotope ratios of the algal lipid dinosterol, isolated from marine lake sediments in Palau, increased by 50 permil between 7.7 and 4.5 ka BP, indicating a reduction in precipitation. This implied drying coincided with increased rainfall to the southwest of Palau in Borneo, weakened northern hemisphere monsoons, strengthened southern hemisphere monsoons, and an equatorward shift of terrestrial photosynthesis. A southward shift of the Intertropical Convergence Zone, forced by insolation, is the most likely cause of these climatic and biospheric changes.","pubRank":"1"}],"site":[{"NOAASiteId":"58221","siteName":"T Lake (Lake 10)","siteCode":null,"mappable":"Y","locationName":"Ocean>Pacific Ocean>Western Pacific Ocean>Micronesia>Palau","geo":{"geoType":"Feature","geometry":{"type":"POINT","coordinates":["7.3045","134.4385"]},"properties":{"southernmostLatitude":"7.3045","northernmostLatitude":"7.3045","westernmostLongitude":"134.4385","easternmostLongitude":"134.4385","minElevationMeters":"0","maxElevationMeters":"0"}},"paleoData":[{"dataTableName":"PTLN-PC1","NOAADataTableId":"40917","earliestYear":10432,"mostRecentYear":117,"timeUnit":"cal yr BP","earliestYearBP":10432,"mostRecentYearBP":117,"earliestYearCE":-8482,"mostRecentYearCE":1833,"coreLengthMeters":12,"dataTableNotes":null,"species":[],"dataFile":[{"fileUrl":"https://www.ncei.noaa.gov/pub/data/paleo/paleolimnology/pacific/palau2018d2h.txt","urlDescription":"NOAA Template File","linkText":"T Lake  Dinosterol H-Isotopic Data","variables":[{"cvDataType":"PALEOLIMNOLOGY","cvWhat":"depth variable>depth","cvMaterial":null,"cvError":null,"cvUnit":"length unit>centimeter","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"composite depth","cvFormat":"Numeric","cvShortName":"depth_cm"},{"cvDataType":"PALEOLIMNOLOGY","cvWhat":"age variable>age","cvMaterial":null,"cvError":null,"cvUnit":"time unit>age unit>calendar year before present","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"CLAM 2.2 linear interpolation of 14C AMS dates","cvFormat":"Numeric","cvShortName":"age_calBP"},{"cvDataType":"PALEOLIMNOLOGY","cvWhat":"chemical composition>compound>organic compound>organic hydroxy compound>sterol>dinosterol","cvMaterial":null,"cvError":null,"cvUnit":"concentration unit>mass fraction unit>microgram per gram","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"assumed 25% 1 sigma uncertainty","cvFormat":"Numeric","cvShortName":"conc_dino"},{"cvDataType":"PALEOLIMNOLOGY","cvWhat":"formation property>formation rate>accumulation rate","cvMaterial":"chemical composition>compound>organic compound>organic hydroxy compound>sterol>dinosterol","cvError":null,"cvUnit":"rate unit>mass per area per time unit>microgram per square centimeter per year","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"assumed 25% 1 sigma uncertainty; product of conc_dino*dry bulk density*linear sed rate","cvFormat":"Numeric","cvShortName":"flux_dino"},{"cvDataType":"PALEOLIMNOLOGY","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H","cvMaterial":"chemical composition>compound>organic compound>organic hydroxy compound>sterol>dinosterol","cvError":null,"cvUnit":"concentration unit>parts per notation unit>parts per thousand>per mil>per mil VSMOW","cvSeasonality":null,"cvDetail":null,"cvMethod":"laboratory method>spectroscopy>mass spectrometry>isotope ratio mass spectrometry>continuous-flow isotope ratio mass spectrometry","cvAdditionalInfo":"average of replicate measurements","cvFormat":"Numeric","cvShortName":"2H_dino"},{"cvDataType":"PALEOLIMNOLOGY","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H","cvMaterial":"chemical composition>compound>organic compound>organic hydroxy compound>sterol>dinosterol","cvError":"standard deviation>one standard deviation","cvUnit":"concentration unit>parts per notation unit>parts per thousand>per mil>per mil VSMOW","cvSeasonality":null,"cvDetail":null,"cvMethod":null,"cvAdditionalInfo":"stdev of replicate measurements","cvFormat":"Numeric","cvShortName":"2H_dino_1sig"}],"NOAAKeywords":["earth science>paleoclimate>paleolimnology>hydrogen isotopes"]}]}]}],"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}