{"NOAAStudyId":"5447","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":"2006-12-01","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-5447.xml","doi":null,"earliestYearBP":107,"earliestYearCE":1843,"entryId":"noaa-lake-5447","funding":[],"investigators":"Gajewski, K.J.; Hamilton, P.; McNeely, R.","mostRecentYearBP":-43,"mostRecentYearCE":1993,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/5447","originalSource":null,"publication":[{"abstract":"Sediments from a 3 ha lake (75deg. 34.34'N, 89deg. 18.55'W) from the coastal region of northern Devon Island, Nunavut, Canada, contain discrete laminations in the deepest part of the basin.  The laminations are varves as indicated  by the correspondence between counts and thickness measurements of the  couplets and Pb210 dating.  A 14cm. core representing 150 years of sedimentation contained laminated  couplets consisting of a lighter inorganic layer with a higher percentage of calcium and magnesium, alternating with fine darker bands, typically  more cohesive, and comprising higher proportions of silica and carbon. A reddish oxidation zone with higher iron and aluminum frequently  separates the laminations.  The dark layer represents a biogenic  component deposited summer and is made cohesive by bacterial filaments  among other the particles.  The light inorganic layer represents clastic deposition from allochthonous sources.  Deposition rates were relatively consistent through the core with an  increase in varve thickness in the 1950's.  Diatom concentrations  in the sediments increased by two orders of magnitude in this century,  with major increases in the 1920's and 1950's.  The increase in varve  thickness and diatom abundance coincides with an increase in summer melt percentage in an ice core from the Devon Island Ice Cap  (Koerner 1997).  The relatively high sedimentation rate (0.15 cm/yr) coupled with the consistency of deposition makes this lake a  significant indicator for recent climate changes of the  Canadian Arctic Archipelago.","author":null,"citation":"Gajewski, K.J., P. Hamilton, R. McNeely. 1997. A high-resolution proxy-climate record from an arctic lake with annually-laminated sediments on Devon Island, Nunavut, Canada. Journal of Paleolimnology Vol. 17, pp.215-225","edition":null,"identifier":null,"issue":null,"journal":"Journal of Paleolimnology","pages":null,"pubRank":"1","pubYear":1997,"reportNumber":null,"title":"A high-resolution proxy-climate record from an arctic lake with annually-laminated sediments on Devon Island, Nunavut, Canada","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"8883","geo":{"geoType":"Feature","geometry":{"coordinates":["75.57","-89.31"],"type":"POINT"},"properties":{"easternmostLongitude":"-89.31","maxElevationMeters":"35","minElevationMeters":"35","northernmostLatitude":"75.57","southernmostLatitude":"75.57","westernmostLongitude":"-89.31"}},"locationName":"Continent>North America>Canada>Nunavut","mappable":"Y","paleoData":[{"NOAADataTableId":"7201","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth 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