{"NOAAStudyId":"13081","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-13081.xml","doi":null,"earliestYearBP":600,"earliestYearCE":1350,"entryId":"noaa-lake-13081","funding":[],"investigators":"Diedrich, K.E.; Loso, M.G.","mostRecentYearBP":53,"mostRecentYearCE":1897,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13081","originalSource":null,"publication":[{"abstract":"Iceberg Lake, a glacier-dammed proglacial lake in southern Alaska, \r\ncontains a 1,500+ year varve record complicated by a history of \r\nepisodic lake-level changes associated with fluctuations in \r\nice-dam thickness and position. To better understand the basinwide \r\nglaciolacustrine response to late Holocene climate variability, \r\nwe collected five cores from two areas in the lake, including \r\na previously unexamined deepwater area distal from inlet streams. \r\nBased on eight AMS 14C dates, and correlations among our cores \r\nand previously documented outcrops, we describe ~1,000 years \r\nof stratigraphy from each area. Deposition at both areas was \r\ndominated by fine-grained varves, but cores from the distal area \r\nuniquely contain coarser deposits, including rhythmites and graded \r\nsand beds, that we attribute to deposition of a subaqueous outwash \r\nfan-delta between ~1250 and 1650 AD. We attribute this event to \r\nthickening of the impounding glacier and consequent incursion of \r\nthe glacier margin, and an associated lateral moraine, into the lake. \r\nThis result suggests an early onset of the Little Ice Age (LIA) \r\nglacial advance in this region. Changes in basinwide circulation \r\nand sedimentation associated with this event probably caused minor \r\nthickening of varves used previously to reconstruct summer \r\ntemperatures, reducing sensitivity of that record to early LIA \r\ncooling. The basinwide impact of this event illustrates the \r\npotentially significant spatial and temporal variability of \r\nlacustrine sedimentary processes in dynamic glacial landscapes. \r\n","author":null,"citation":"Diedrich, K.E. and M.G. Loso. 2012. \r\nTransient impacts of Little Ice Age glacier expansion on sedimentation \r\nprocesses at glacier-dammed Iceberg Lake, southcentral Alaska. \r\nJournal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 115-132. \r\nDOI: 10.1007/s10933-012-9614-5","edition":null,"identifier":{"id":"10.1007/s10933-012-9614-5","type":"doi","url":"http://dx.doi.org/10.1007/s10933-012-9614-5"},"issue":null,"journal":"Journal of Paleolimnology","pages":null,"pubRank":"1","pubYear":2012,"reportNumber":null,"title":"Transient impacts of Little Ice Age glacier expansion on sedimentation  processes at glacier-dammed Iceberg Lake, southcentral Alaska","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["Little Ice Age (LIA)","PAGES Arctic 2k","Arctic"],"site":[{"NOAASiteId":"20672","geo":{"geoType":"Feature","geometry":{"coordinates":["60.783","-142.95"],"type":"POINT"},"properties":{"easternmostLongitude":"-142.95","maxElevationMeters":"933","minElevationMeters":"933","northernmostLatitude":"60.783","southernmostLatitude":"60.783","westernmostLongitude":"-142.95"}},"locationName":"Continent>North America>United States Of America>Alaska","mappable":"Y","paleoData":[{"NOAADataTableId":"22535","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/iceberg2012.txt","linkText":"iceberg2012.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"physical property>length>varve thickness"},{"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 start"},{"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":"year Common Era","cvWhat":"age variable>age"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/iceberg2012.xls","linkText":"iceberg2012.xls","urlDescription":"Data","variables":[]}],"dataTableName":"IcebergP1","dataTableNotes":null,"earliestYear":1350,"earliestYearBP":600,"earliestYearCE":1350,"mostRecentYear":1897,"mostRecentYearBP":53,"mostRecentYearCE":1897,"species":[],"timeUnit":"AD"}],"siteName":"Iceberg Lake"}],"studyCode":null,"studyName":"Iceberg Lake, Alaska 1500 Year Varve Thickness Data","studyNotes":"Varve thickness measurements from Iceberg Lake, southern Alaska. \n\nIceberg Lake, Alaska: 60°47'N, 142°57'W, 933m elev. ","version":"1.0","xmlId":"11123"}