Nerfloen Norway 7800 Year Lake Sediment Data Vasskog, K.; Paasche, O.; Nesje, A.; Boyle, J.; Birks, H.J.B. Vasskog, K. Paasche, O. Nesje, A. Boyle, J. Birks, H.J.B. earth science/paleoclimate/paleolimnology (manganese,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,null,N,very coarse silt) earth science/paleoclimate/paleolimnology (magnetic susceptibility,sediment,null,dimensionless,null,paleolimnology,normalized,null,N,null) earth science/paleoclimate/paleolimnology (iron,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (mass magnetic susceptibility,sediment,null,cubic meter per kilogram,null,paleolimnology,null,null,N,x10-7 units) earth science/paleoclimate/paleolimnology (zirconium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,null,N,medium silt) earth science/paleoclimate/paleolimnology (clay,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (principal component,null,null,dimensionless,null,paleolimnology,null,null,N,axis 1) earth science/paleoclimate/paleolimnology (potassium/titanium,sediment,null,dimensionless,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,null,N,fine silt) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,null,N,very fine silt) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,null,N,coarse silt) earth science/paleoclimate/paleolimnology (rubidium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (strontium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (density,dry sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,null) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Nerfloen>LATITUDE 61.9333>LONGITUDE 6.8667) 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. STUDY NOTES: 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Vasskog, K. Investigator : Paasche, O. Investigator : Nesje, A. Investigator : Boyle, J. Investigator : Birks, H.J.B. 2012-02-13 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/12503 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/nerfloen2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/nerfloen2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/nerfloen2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/nerfloen2012.xls English https://www.ncdc.noaa.gov/paleo/study/12503 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/nerfloen2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/nerfloen2012.xls 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, Vol. 77, Issue 1, January 2012, pp 192-204. doi:10.1016/j.yqres.2011.10.001 START YEAR: 7775 cal yr BP * END YEAR: -20 cal yr BP 6.8667 61.9333 6.8667 61.9333