{"NOAAStudyId":"13080","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":"2012-06-30","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-13080.xml","doi":null,"earliestYearBP":14428,"earliestYearCE":-12478,"entryId":"noaa-lake-13080","funding":[],"investigators":"Oswald, W.; Gavin, D.G.; Anderson, P.M.; Brubaker, L.B.; Hu, F.S.","mostRecentYearBP":-47,"mostRecentYearCE":1997,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13080","originalSource":null,"publication":[{"abstract":"Analyses of lithology, organic-matter content, magnetic \r\nsusceptibility, and pollen in a sediment core from Okpilak Lake, \r\nlocated in the northeastern Brooks Range, provide new insights \r\ninto the history of climate, landscape processes, and vegetation \r\nin northern Alaska since 14,500 cal year BP. The late-glacial \r\ninterval (>11,600 cal year BP) featured sparse vegetation cover \r\nand the erosion of minerogenic sediment into the lake from nearby \r\nhillslopes, as evidenced by Cyperaceae-dominated pollen assemblages \r\nand high magnetic susceptibility (MS) values. Betula expanded \r\nin the early Holocene (11,600-8,500 cal year BP), reducing mass \r\nwasting on the landscape, as reflected by lower MS. Holocene \r\nsediments contain a series of silt- and clay-dominated layers, \r\nand given their physical characteristics and the topographic \r\nsetting of the lake on the braided outwash plain of the Okpilak \r\nRiver, the inorganic layers are interpreted as rapidly deposited \r\nfluvial sediments, likely associated with intervals of river \r\naggradation, changes in channel planform, and periodic overbank \r\nflow via a channel that connects the river and lake. The episodes \r\nof fluvial dynamics and aggradation appear to have been related \r\nto regional environmental variability, including a period of \r\nglacial retreat during the early Holocene, as well as glacial \r\nadvances in the middle Holocene (5,500-5,200 cal year BP) \r\nand during the Little Ice Age (500-400 cal year BP). \r\nThe rapid deposition of multiple inorganic layers during \r\nthe early Holocene, including thick layers at 10,900-10,000 \r\nand 9,400-9,200 cal year BP, suggests that it was a particularly \r\ndynamic interval of fluvial activity and landscape change. \r\n","author":null,"citation":"Oswald, W.W., D.G. Gavin, P.M. Anderson, L.B. Brubaker, \r\nand F.S. Hu. 2012. \r\nA 14,500-year record of landscape change from Okpilak Lake, \r\nnortheastern Brooks Range, northern Alaska. \r\nJournal of Paleolimnology, Vol. 48, No. 1, June 2012, \r\npp. 101-113. DOI: 10.1007/s10933-012-9605-6 ","edition":null,"identifier":{"id":"10.1007/s10933-012-9605-6","type":"doi","url":"http://dx.doi.org/10.1007/s10933-012-9605-6"},"issue":null,"journal":"Journal of Paleolimnology","pages":null,"pubRank":"1","pubYear":2012,"reportNumber":null,"title":"A 14,500-year record of landscape change from Okpilak Lake,  northeastern Brooks Range, northern Alaska","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["Little Ice Age (LIA)","PAGES Arctic 2k","Arctic"],"site":[{"NOAASiteId":"53158","geo":{"geoType":"Feature","geometry":{"coordinates":["69.4081","-144.0489"],"type":"POINT"},"properties":{"easternmostLongitude":"-144.0489","maxElevationMeters":"593","minElevationMeters":"593","northernmostLatitude":"69.4081","southernmostLatitude":"69.4081","westernmostLongitude":"-144.0489"}},"locationName":"Continent>North America>United States Of America>Alaska","mappable":"Y","paleoData":[{"NOAADataTableId":"22534","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>magnetic susceptibility","earth science>paleoclimate>paleolimnology>population abundance","earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/okpilak2012.txt","linkText":"okpilak2012.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless (SI system)","cvWhat":"magnetic property>magnetic moments>magnetic susceptibility"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar year before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"loss on ignition","cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"biological material>bulk biological material>organic matter"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>magnetic susceptibility","earth science>paleoclimate>paleolimnology>physical properties","earth science>paleoclimate>paleolimnology>population abundance"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/okpilak2012.xls","linkText":"okpilak2012.xls","urlDescription":"Data","variables":[]}],"dataTableName":"OK2","dataTableNotes":null,"earliestYear":14428,"earliestYearBP":14428,"earliestYearCE":-12478,"mostRecentYear":-47,"mostRecentYearBP":-47,"mostRecentYearCE":1997,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Okpilak Lake"}],"studyCode":null,"studyName":"Okpilak Lake, Alaska 14,500 Year Multiproxy Sediment Data","studyNotes":"Multiproxy sediment data from Okpilak Lake, Alaska, for the past 14,500 years. \nPaleoenvironmental proxies measured include lithology, organic-matter content, \nmagnetic susceptibility, and pollen taxa. \n\nOkpilak Lake, Alaska: 69°24'29\"N, 144°02'56\"W, 593m elevation ","version":"1.0","xmlId":"11122"}