Lake Jøkelvatnet, Arctic Norway 12,000 Year Sediment Titanium Data Wittmeier, H.E.; Bakke, J.; Vasskog, K.; Trachsel, M. Wittmeier, H.E. Bakke, J. Vasskog, K. Trachsel, M. earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (titanium,sediment,null,count per second,null,paleolimnology,null,energy-dispersive x-ray fluorescence spectroscopy,N,kcounts/second) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (Lake Jøkelvatnet>LATITUDE 70.1725>LONGITUDE 21.7008) Late Glacial and Holocene glacier fluctuations are important indicators of climate variability in the northern polar region and contain knowledge vital to understanding and predicting present and future climate changes. However, there still is a lack of robustly dated terrestrial climate records from Arctic Norway. Here, we present a high-resolution relative glacier activity record covering the past ~10,000 cal. a BP from the northern outlet of the Langfjordjøkelen ice cap in Arctic Norway. This record is reconstructed from detailed geomorphic mapping, multi-proxy sedimentary fingerprinting and analyses of distal glacier-fed lake sediments. We used Principal Component Analysis to characterize sediments of glacial origin and trace them in a chain of downstream lakes. Of the variability in the sediment record of the uppermost Lake Jøkelvatnet, 73% can be explained by the first Principal Component axis and tied directly to upstream glacier erosion, whereas the glacial signal becomes weaker in the more distal Lakes Store Rundvatnet and Storvatnet. Magnetic susceptibility and titanium count rates were found to be the most suitable indicators of Holocene glacier activity in the distal glacier-fed lakes. The complete deglaciation of the valley of Sør-Tverrfjorddalen occurred ~10,000 cal. a BP, followed by a reduced or absent glacier during the Holocene Thermal Optimum. The Langfjordjøkelen ice cap reformed with the onset of the Neoglacial ~4100 cal. a BP, and the gradually increasing glacier activity culminated at the end of the Little Ice Age in the early 20th century. Over the past 2000 cal. a BP, the record reflects frequent high-amplitude glacier fluctuations. Periods of reduced glacier activity were centered around 1880, 1600, 1250 and 950 cal. a BP, while intervals of increased glacier activity occurred around 1680, 1090, 440 and 25 cal. a BP. The large-scale Holocene glacier activity of the Langfjordjøkelen ice cap is consistent with regional temperature proxy reconstructions and glacier variability across Norway. Long-term changes in the extent of the northern outlet of the Langfjordjøkelen ice cap largely followed trends in regional summer temperatures, whereas winter season atmospheric variability may have triggered decadal-scale glacial fluctuations and generally affected the amplitude of glacier events. STUDY NOTES: Titanium concentration data from sediment core JØP-112 collected from Lake Jøkelvatnet, Arctic Norway. Jøkelvatnet is a distal glacier-fed lake of the Langfjordjøkelen ice cap, in the Sør-Tverrfjorddalen valley, Finnmark County, Norway. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Wittmeier, H.E. Investigator : Bakke, J. Investigator : Vasskog, K. Investigator : Trachsel, M. 2015-03-06 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/18176 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/jokelvatnet2015ti.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/jokelvatnet2015ti.txt English https://www.ncdc.noaa.gov/paleo/study/18176 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/jokelvatnet2015ti.txt Hella E. Wittmeier, Jostein Bakke, Kristian Vasskog, Mathias Trachsel2015Reconstructing Holocene glacier activity at Langfjordjøkelen, Arctic Norway, using multi-proxy fingerprinting of distal glacier-fed lake sedimentsQuaternary Science Reviews11478-9910.1016/j.quascirev.2015.02.007http://www.sciencedirect.com/science/article/pii/S0277379115000633 START YEAR: 12412 cal yr BP * END YEAR: -55 cal yr BP 21.7008 70.1725 21.7008 70.1725