{"NOAAStudyId":"21111","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":"2016-12-21","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-21111.xml","doi":null,"earliestYearBP":4113,"earliestYearCE":-2163,"entryId":"noaa-lake-21111","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"SBD-HSD 0611320, DGE0221594, AGS 1243125"}],"investigators":"Conroy, J.L.; Hudson, A.M.; Overpeck, J.T.; Liu, K.-B.; Wang, L.; Cole, J.E.","mostRecentYearBP":-57,"mostRecentYearCE":2007,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/21111","originalSource":null,"publication":[{"abstract":"The nature of multidecadal to centennial variability of the Asian monsoon is largely unknown, hindering our understanding of how the modern precipitation regime compares to preindustrial variability, as well as how the Asian monsoon may change in coming decades. Here we use the sediment record from a closed-basin lake in southern Tibet, Ngamring Tso, along with other published paleoclimatic records, to assess summer monsoon precipitation variability over the 20th century and during the late Holocene (4100 cal yr BP to present). The first principal component of the Ngamring Tso grain size record, which is highly correlated with median grain size, correlates significantly with observed summer (June-September) precipitation. From CE 1940 to 2007, grain size decreased with increasing summer precipitation and increased with decreasing summer precipitation. Satellite images of Ngamring Tso reveal larger lake area in the 1970s and 2000s and smaller lake area in the 1980s and 1990s, suggesting monsoon precipitation-induced changes in lake depth or area likely govern grain size variability. In the context of the last 4100 yr, prolonged periods of relatively weak summer monsoon precipitation occurred from 2800-2600 cal yr BP, 2500-2300 cal yr BP, and 1600-400 cal yr BP. A trend toward increased summer precipitation began around 1000 cal yr BP, with above-average summer precipitation from 400 cal yr BP to present, peaking between 200-100 cal yr BP (CE 1750-1850). Dry and wet periods are coincident with dry and wet periods in other south-central Tibetan lake sediment records that reflect precipitation or moisture balance, and with regional proxies of the ISM and EASM, indicating south-central Tibet is influenced by both monsoon subsystems. However, western Tibet lake sediment records do not covary with the Ngamring Tso record, suggesting the spatial variability in Tibet precipitation that occurs on interannual timescales today may also characterize precipitation on multidecadal and centennial timescales during the late Holocene. 20th century precipitation variability in southern Tibet falls within the range of natural variability in the last 4100 yr, and does not show a clear trend of increasing precipitation as projected by models. Instead, it appears that poorly understood multidecadal to centennial internal modes of monsoon variability remained influential throughout the last 4100 yr. Thus, substantial multidecadal to centennial-scale hydroclimatic variability will complicate our ability to project and prepare for anthropogenic changes in the region's monsoon precipitation.","author":{"name":"Jessica L. Conroy, Adam M. Hudson, Jonathan T. Overpeck, Kam-Biu Liu, Luo Wang, Julia E. Cole"},"citation":"Jessica L. Conroy, Adam M. Hudson, Jonathan T. Overpeck, Kam-Biu Liu, Luo Wang, Julia E. Cole. 2017. The primacy of multidecadal to centennial variability over late-Holocene forced change of the Asian Monsoon on the southern Tibetan Plateau. Earth and Planetary Science Letters, 458, 357-348. doi: 10.1016/j.epsl.2016.10.044","edition":null,"identifier":{"id":"10.1016/j.epsl.2016.10.044","type":"doi","url":"http://dx.doi.org/10.1016/j.epsl.2016.10.044"},"issue":null,"journal":"Earth and Planetary Science Letters","pages":"357-348","pubRank":"1","pubYear":2017,"reportNumber":null,"title":"The primacy of multidecadal to centennial variability over late-Holocene forced change of the Asian Monsoon on the southern Tibetan Plateau","type":"publication","volume":"458"}],"reconstruction":"Y","scienceKeywords":["Precipitation Reconstruction","Monsoon"],"site":[{"NOAASiteId":"57018","geo":{"geoType":"Feature","geometry":{"coordinates":["29.3","87.2"],"type":"POINT"},"properties":{"easternmostLongitude":"87.2","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"29.3","southernmostLatitude":"29.3","westernmostLongitude":"87.2"}},"locationName":"Continent>Asia>Eastern Asia>China","mappable":"Y","paleoData":[{"NOAADataTableId":"31824","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>reconstruction"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ngamringtso2017precip.txt","linkText":"Ngamring Tso Precipitation Reconstruction","urlDescription":"Formatted Text Data File","variables":[{"cvAdditionalInfo":"based on grain size","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":"anomalized","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":"4-month period>Jun-Sep","cvShortName":null,"cvUnit":"millimeter per day","cvWhat":"earth system variable>hydroclimatic variable>hydroclimate rate>precipitation"},{"cvAdditionalInfo":"based on grain size","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":"anomalized","cvError":"95% confidence interval lower 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property>diameter>grain size>grain size class"},{"cvAdditionalInfo":"grain size 1659.586907 to 1905.460718  microns","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"volume percent","cvWhat":"physical property>diameter>grain size>grain size class"},{"cvAdditionalInfo":"grain size 1905.460718  to 2187.761624 microns","cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"volume percent","cvWhat":"physical property>diameter>grain size>grain size class"}]}],"dataTableName":"NgamringTso2017GS","dataTableNotes":null,"earliestYear":4088,"earliestYearBP":4088,"earliestYearCE":-2138,"mostRecentYear":-57,"mostRecentYearBP":-57,"mostRecentYearCE":2007,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Ngamring Tso"}],"studyCode":null,"studyName":"Ngamring Tso, Tibet 4,100 Year Sediment Data and Precipitation Reconstruction","studyNotes":"Sediment physical properties (grain size, loss-on-ignition) and geochemical (elemental composition) data from sediments collected in Ngamring Tso, Tibet, plus summer monsoon (June-September) precipitation reconstruction, covering the past 4,100 years. ","version":"1.0","xmlId":"19050"}