{"NOAAStudyId":"14388","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":"2013-05-12","dataPublisher":"NOAA","dataType":"PALEOLIMNOLOGY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/lake","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-14388.xml","doi":null,"earliestYearBP":945,"earliestYearCE":1005,"entryId":"noaa-lake-14388","funding":[{"fundingAgency":"Major State Basic Research Development Program of China","fundingGrant":"2012CB214701"},{"fundingAgency":"Chinese Academy of Sciences","fundingGrant":"XDB03020405"},{"fundingAgency":"National Natural Science Foundation China","fundingGrant":"40871096"}],"investigators":"Pu, Y.; Nace, T.; Meyers, P.A.; Zhang, H.; Wang, Y.; Zhang, C.L.; Shao, X.M.","mostRecentYearBP":-54,"mostRecentYearCE":2004,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/14388","originalSource":null,"publication":[{"abstract":"Total organic carbon (Corg) and nitrogen (Ntot) concentrations and isotope compositions and n-alkane and n-alkan-ol molecular biomarker compositions were measured in two parallel sediment cores from Lake Ximencuo, a typical glacial lake on the eastern Qinghai-Tibetan Plateau (QTP), to reconstruct local climatic variations during the past 1000 yr. Concentrations of Corg and Ntot vary similarly with changes in precipitation recorded by tree rings in Dulan, northeastern QTP, indicating their close relation to precipitation. Carbon Preference Index (CPI) values of C22-C33n-alkanes and C22-C28n-alkan-1-ols and Average Chain Length (ACL) values of C27-C33n-alkanes generally negatively correlate with d13Corg and d15Ntot and also vary comparably with the oxygen isotope temperature record from the Dunde ice core, northeastern QTP. These patterns indicate that high CPI values and negative shifts of the d13Corg and d15Ntot correspond to warmer conditions that favor the growth of vascular land plants and that lower values and positive shifts correspond to cooler conditions in the Lake Ximencuo locality. This observation contradicts previous interpretations from peat and modern soil studies that conclude that the CPI indices were controlled by microbial degradation under different climate conditions. Here we propose that the changes of organic matter sources under different climate regimes, combined with physiological adjustments of vascular plants to different air temperatures, might yield different CPI responses to climate changes in glacial plateau lakes. Air temperature and precipitation increases and decreases reconstructed in this 1000-yr study were generally independent of each other, but they both occurred at centennial or multi-centennial scales. The interaction between subtropical (Asian Monsoon) and mid-latitude (Westerly) atmospheric circulation systems probably dominated the local precipitation variations in the Lake Ximencuo catchment, whereas solar insolation, volcanism and greenhouse gas variations were likely responsible for the air temperature changes that are recorded in the lake sediments and that are consistent with regional temperature variations in the eastern QTP.","author":null,"citation":"Yang Pu, Trevor Nace, Philip A. Meyers, Hucai Zhang, Yongli Wang, Chuanlun L. Zhang, Xiaohua Shao. 2013.\r\nPaleoclimate changes of the last 1000 yr on the eastern Qinghai-Tibetan Plateau recorded by elemental, isotopic, and molecular organic matter proxies in sediment from glacial Lake Ximencuo. \r\nPalaeogeography, Palaeoclimatology, Palaeoecology, Vol. 379-380, pp. 39-53. DOI: 10.1016/j.palaeo.2013.03.023","edition":null,"identifier":{"id":"10.1016/j.palaeo.2013.03.023","type":"doi","url":"http://dx.doi.org/10.1016/j.palaeo.2013.03.023"},"issue":null,"journal":"Palaeogeography, Palaeoclimatology, Palaeoecology","pages":null,"pubRank":"1","pubYear":2013,"reportNumber":null,"title":"Paleoclimate changes of the last 1000 yr on the eastern Qinghai-Tibetan Plateau recorded by elemental, isotopic, and molecular organic matter proxies in sediment from glacial Lake Ximencuo","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["hydrology","temperature","Monsoon"],"site":[{"NOAASiteId":"54849","geo":{"geoType":"Feature","geometry":{"coordinates":["33.378","101.106"],"type":"POINT"},"properties":{"easternmostLongitude":"101.106","maxElevationMeters":"4020","minElevationMeters":"4020","northernmostLatitude":"33.378","southernmostLatitude":"33.378","westernmostLongitude":"101.106"}},"locationName":"Continent>Asia>Eastern Asia>China","mappable":"Y","paleoData":[{"NOAADataTableId":"24356","coreLengthMeters":0,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ximencuo2013xmc6.txt","linkText":"ximencuo2013xmc6.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth>depth at sample end"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth>depth at sample 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length"}]}],"dataTableName":"XMC-6","dataTableNotes":null,"earliestYear":1154,"earliestYearBP":796,"earliestYearCE":1154,"mostRecentYear":1989,"mostRecentYearBP":-39,"mostRecentYearCE":1989,"species":[],"timeUnit":"AD"},{"NOAADataTableId":"24355","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry","earth science>paleoclimate>paleolimnology>carbon isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ximencuo2013xmc5.txt","linkText":"ximencuo2013xmc5.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":"corrected for the Suess effect","cvDataType":"PALEOLIMNOLOGY","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>bulk biological material>organic matter","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 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material>sediment","cvMethod":"elemental analysis","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"chemical composition>element or single-element molecule>nitrogen"},{"cvAdditionalInfo":"organic carbon/total nitrogen","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"elemental analysis","cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>element or compound ratio>carbon/nitrogen"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>bulk biological material>organic matter","cvMethod":"isotope ratio mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"}]}],"dataTableName":"XMC-5","dataTableNotes":null,"earliestYear":1005,"earliestYearBP":945,"earliestYearCE":1005,"mostRecentYear":2004,"mostRecentYearBP":-54,"mostRecentYearCE":2004,"species":[],"timeUnit":"AD"}],"siteName":"Lake Ximencuo"}],"studyCode":null,"studyName":"Lake Ximencuo, Tibet 1000 Year Multiproxy Sediment Data","studyNotes":"Total organic carbon (Corg) and nitrogen (Ntot) concentrations and isotope \n compositions and n-alkane and n-alkan-ol molecular biomarker compositions \nwere measured in two parallel sediment cores from Lake Ximencuo, a typical \nglacial lake on the eastern Qinghai-Tibetan Plateau (QTP), to reconstruct \nlocal climatic variations during the past 1000 yr. \nXimenCuo core XMC-5 data are plotted in Fig.3 and Fig.9\nXimenCuo core XMC-6 data are plotted in Fig.7 and Fig.9","version":"1.0","xmlId":"12369"}