{"xmlId":"10546","NOAAStudyId":"12503","studyName":"Nerfloen Norway 7800 Year Lake Sediment Data","doi":"https://doi.org/10.25921/fx10-df76","uuid":"838beadc-0c5c-4cb5-b146-7333467a3289","dataPublisher":"NOAA","contactInfo":{"type":"CONTACT INFORMATION","shortName":"DOC/NOAA/NESDIS/NCEI","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","address":"325 Broadway, E/NE31","city":"Boulder","state":"CO","postalCode":"80305-3328","country":"USA","dataCenterUrl":"https://www.ncei.noaa.gov/products/paleoclimatology","email":"paleo@noaa.gov","phone":"828-271-4800","fax":null,"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."},"dataType":"PALEOLIMNOLOGY","investigators":"Vasskog, K.; Paasche, O.; Nesje, A.; Boyle, J.; Birks, H.J.B.","investigatorDetails":[{"firstName":"Kristian","lastName":"Vasskog","initials":"K.","orcId":"0000-0002-4703-959X"},{"firstName":"Øyvind","lastName":"Paasche","initials":"O.","orcId":"0000-0003-0329-9063"},{"firstName":"Atle","lastName":"Nesje","initials":"A.","orcId":"0000-0001-8508-5805"},{"firstName":"John","lastName":"Boyle","initials":"J.","orcId":"0000-0002-1172-1079"},{"firstName":"H. John","lastName":"Birks","initials":"H.J.B.","orcId":"0000-0002-5891-9859"}],"version":"1.0","funding":[{"fundingAgency":"University of Bergen, Norway","fundingGrant":null}],"studyNotes":"This file contains the data plotted in figure 8 in Vasskog et al. 2012. This includes the first principal component (1st PC) of 15 lake sediment parameters, and the ratio between bulk magnetic susceptibility measured at 77K and 293K, plotted against a 4th degree polynomial age-depth model. Principal Component Analysis (PCA) is employed to detect patterns of variability that are shared between the investigated lake sediment variables. The PCA includes primary count rates of Fe, Rb, Mn, Sr, Zr, and the K/Ti ratio, six grain-size classes as compositional percentages, and physical sediment variables LOI, DBD, and XBulk, resulting in a final data set containing 15 different variables, with a stratigraphical resolution of one centimeter. The first PCA explains 77% of the total variability of the data set. Sections interpreted as rapid depositional events (e.g. flood and avalanche deposits) have been removed from this data set. The physical parameters (LOI, DBD and magnetism) were, however, plotted prior to removal of these 'event layers' in figure 3 of the paper. The methodology used for detecting event layers is described in the supplementary material of the paper. Nerfloen, western Norway: 61°56'N, 6°52'E, 29m elevation, 18m depth.","onlineResourceLink":"https://www.ncei.noaa.gov/access/paleo-search/study/12503","difMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-12503.xml","isoMetadataLink":"https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/iso/xml/noaa-lake-12503.xml","originalSource":null,"dataTypeInformation":"https://www.ncei.noaa.gov/products/paleoclimatology/lake","studyCode":null,"scienceKeywords":null,"reconstruction":"N","contributionDate":"2012-02-13","entryId":"noaa-lake-12503","earliestYearBP":7775,"mostRecentYearBP":-20,"earliestYearCE":-5825,"mostRecentYearCE":1970,"publication":[{"author":{"name":"Vasskog, K., Ø. Paasche, A. Nesje, J.F. Boyle, and H.J.B. Birks"},"pubYear":2012,"title":"A new approach for reconstructing glacier variability based on lake sediments recording input from more than one glacier","journal":"Quaternary Research","volume":"77","edition":null,"issue":"1","pages":"192-204","reportNumber":null,"citation":"Vasskog, K., Ø. Paasche, A. Nesje, J.F. Boyle, and H.J.B. Birks. 2012. A new approach for reconstructing glacier variability based on lake sediments recording input from more than one glacier. Quaternary Research, 77(1), 192-204. doi: 10.1016/j.yqres.2011.10.001","type":"publication","identifier":{"type":"doi","id":"10.1016/j.yqres.2011.10.001","url":"http://dx.doi.org/10.1016/j.yqres.2011.10.001"},"abstract":"We explore the possibility of building a continuous glacier reconstruction by analyzing the integrated sedimentary response of a large (440 km2) glacierized catchment in western Norway, as recorded in the downstream lake Nerfloen (N61°56', E6°52'). A multi-proxy numerical analysis demonstrates that it is possible to distinguish a glacier component in the ~8000-yr-long record, based on distinct changes in grain size, geochemistry, and magnetic composition. Principal Component Analysis (PCA) reveals a strong common signal in the 15 investigated sedimentary parameters, with the first principal component explaining 77% of the total variability. This signal is interpreted to reflect glacier activity in the upstream catchment, an interpretation that is independently tested through a mineral magnetic provenance analysis of catchment samples.  Minimum glacier input is indicated between 6700-5700 cal yr BP, probably reflecting a situation when most glaciers in the catchment had melted away, whereas the highest glacier activity is observed around 600 and 200 cal yr BP. During the local Neoglacial interval (~4200 cal yr BP until present), five individual periods of significantly reduced glacier extent are identified at ~3400, 3000-2700, 2100-2000, 1700-1500, and ~900 cal yr BP.","pubRank":"1"}],"site":[{"NOAASiteId":"52698","siteName":"Nerfloen","siteCode":null,"mappable":"Y","locationName":"Continent>Europe>Northern Europe>Scandanavia>Norway","geo":{"geoType":"Feature","geometry":{"type":"POINT","coordinates":["61.9333","6.8667"]},"properties":{"southernmostLatitude":"61.9333","northernmostLatitude":"61.9333","westernmostLongitude":"6.8667","easternmostLongitude":"6.8667","minElevationMeters":"29","maxElevationMeters":"29"}},"paleoData":[{"dataTableName":"N2012","NOAADataTableId":"20856","earliestYear":7775,"mostRecentYear":-20,"timeUnit":"cal yr 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