Lake Storsjön Mineral and Paleoflood Data Labuhn, I.; Hammarlund, D.; Chapron, E.; Czymzik, M.; Dumoulin, J.-P.; Nilsson, A.; Régnier, E.; Robygd, J.; von Grafenstein, U. Labuhn, I. Hammarlund, D. Chapron, E. Czymzik, M. Dumoulin, J.-P. Nilsson, A. Régnier, E. Robygd, J. von Grafenstein, U. Other Hydroclimate Reconstruction earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,midpoint of the 50-year interval) earth science/paleoclimate/paleolimnology (water content,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,heated to 105 degrees C for 2 hours) earth science/paleoclimate/paleolimnology (iron,sediment,null,parts per million,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (copper,sediment,null,parts per million,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (sulfur,sediment,null,parts per million,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (molybdenum/aluminum,sediment,null,dimensionless,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (phosphorus,sediment,null,parts per million,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (silicon,sediment,null,parts per million,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (event layer,sediment,null,count,null,paleolimnology,null,null,N,number of black layers per 50 year interval) earth science/paleoclimate/paleolimnology (titanium,sediment,null,parts per million,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (calcium,sediment,null,parts per million,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,combusted at 550 degrees C for 4 hours) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (zirconium/potassium,sediment,null,dimensionless,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (Lake Storsjön>LATITUDE 63.12>LONGITUDE 14.37) Despite the societal importance of extreme hydroclimate events, few palaeoenvironmental studies of Scandinavian lake sediments have investigated flood occurrences. Here we present a flood history based on lithological, geochemical and mineral magnetic records of a Holocene sediment sequence collected from contourite drift deposits in Lake Storsjön (63.12N, 14.37E). After the last deglaciation, the lake began to form around 9800 cal yr BP, but glacial activity persisted in the catchment for ~250 years. Element concentrations and mineral magnetic properties of the sediments indicate relatively stable sedimentation conditions during the Holocene. However, human impact in the form of expanding agriculture is evident from about 1100 cal yr BP, and intensified in the 20th century. Black layers containing iron sulphide appear irregularly throughout the sequence. The increased influx of organic matter during flood events led to decomposition and oxygen consumption, and eventually to anoxic conditions in the interstitial water preserving these layers. Elevated frequencies of black layer occurrence between 3600 and 1800 cal yr BP reflect vegetation changes in the catchment as well as large-scale climatic change. Soil erosion during snowmelt flood events increased with a tree line descent since the onset of the neoglacial period (~4000 cal yr BP). The peak in black layer occurrence coincides with a prominent solar minimum ~2600 cal yr BP, which may have accentuated the observed pattern due to the prevalence of a negative NAO index, a longer snow accumulation period and consequently stronger snowmelt floods. STUDY NOTES: Sediment geochemical data and flood layers from Lake Storsjön, Sweden for the past 11,000 years NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Labuhn, I. Investigator : Hammarlund, D. Investigator : Chapron, E. Investigator : Czymzik, M. Investigator : Dumoulin, J.-P. Investigator : Nilsson, A. Investigator : Régnier, E. Investigator : Robygd, J. Investigator : von Grafenstein, U. 2018-02-06 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/23372 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/sweden/storsjon2018flood.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/sweden/storsjon2018flood.txt English https://www.ncdc.noaa.gov/paleo/study/23372 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/sweden/storsjon2018flood.txt Inga Labuhn, Dan Hammarlund, Emmanuel Chapron, Markus Czymzik, Jean-Pascal Dumoulin, Andreas Nilsson, Edouard Régnier, Joakim Robygd, Ulrich von Grafenstein2018Holocene Hydroclimate Variability in Central Scandinavia Inferred from Flood Layers in Contourite Drift Deposits in Lake StorsjönQuaternary21110.3390/quat1010002http://www.mdpi.com/2571-550X/1/1/2 START YEAR: 10961 cal yr BP * END YEAR: -56 cal yr BP 14.37 63.12 14.37 63.12