Lofoten Islands, Norway Multiproxy Holocene Lake Sediment Data Balascio, N.L.; Bradley, R.S. Balascio, N.L. Bradley, R.S. PAGES 2k Network PAGES Arctic 2k earth science/paleoclimate/paleolimnology (volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,null,N,x10-5 units) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (accumulation rate,sediment,null,gram per square centimeter per year,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,null,N,total organic carbon/total nitrogen) earth science/paleoclimate/paleolimnology (delta 13C,sediment,null,per mil,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,gram per square centimeter per year,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar kiloyear before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (titanium,sediment,null,peak area integral,null,paleolimnology,null,energy-dispersive x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Fiskebølvatnet>LATITUDE 68.41>LONGITUDE 14.8) (Vikjordavatnet>LATITUDE 68.23>LONGITUDE 14.06) We analyzed Holocene sedimentary records from two lakes in the Lofoten Islands, northern Norway to evaluate environmental changes during the Holocene related to northern North Atlantic climate dynamics. The lakes are located in different geomorphological settings, and thus provide a contrast in their response to regional climate change. Environmental changes at both lakes were interpreted based on magnetic susceptibility, organic-matter flux, C/N, d13Corg, Ti concentrations, and mass accumulation rates. Chronologies were established using 16 AMS radiocarbon dates, and average deposition rates in both environments are higher than 0.2 mm/year throughout the Holocene. At Vikjordvatnet, sedimentary geochemical properties define three distinct phases of sedimentation related to changes in aquatic productivity and gradual landscape development. Following deglaciation, during the early Holocene (11.6–7.2 ka), aquatic productivity increased and the landscape stabilized as regional temperatures increased in response to higher summer insolation and increasing inflow of warm Atlantic water into the Norwegian Sea. Centennial-scale intervals of decreased organic- matter flux, from 10.9 to 10.2 ka and 9.2 to 8.0 ka, record episodes of instability during the early Holocene. These may represent regional cooling events related to freshwater forcing and a slowdown of the northward transport of warm water into the North Atlantic. During the mid-Holocene (7.2–4.8 ka) organic-matter properties show less variability and the timing of this phase corresponds with the regional Holocene thermal maximum. The late Holocene sediments (4.8 ka–present) record a transition to colder climate conditions. The record from Fiskebølvatnet captures periodic changes in clastic input related to runoff and exhibits high-frequency variations over the last 9.5 ka. The most significant change in sedimentation was during the late Holocene (4.3 ka–present) when the frequency and magnitude of runoff events show an abrupt transition to wetter conditions. The timing of this shift corresponds to other regional reconstructions that indicate wetter and colder conditions during the late Holocene. STUDY NOTES: Multiproxy Holocene sediment data from 2 lakes in the Lofoten Islands, northern Norway. Paleoenvironmental proxies measured include magnetic susceptibility, organic-matter flux, C/N, d13Corg, Ti concentrations, and mass accumulation rates. Lofoten Islands lake locations: Fiskebølvatnet: 68.41°N, 14.80°E, 23m elevation, 44m water depth. Vikjordavatnet: 68.23°N, 14.06°W, 23m elevation, 21m water depth. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Balascio, N.L. Investigator : Bradley, R.S. 2012-06-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13118 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/lofoten2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/lofoten2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/lofoten2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/lofoten2012.txt English https://www.ncdc.noaa.gov/paleo/study/13118 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/lofoten2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/norway/lofoten2012.txt Balascio, N.L. and R.S. Bradley. 2012. Evaluating Holocene climate change in northern Norway using sediment records from two contrasting lake systems. Journal of Paleolimnology, Vol. 48, No. 1, June 2012, pp. 259-273. DOI: 10.1007/s10933-012-9604-7 START YEAR: 11521 cal yr BP * END YEAR: 337 cal yr BP 14.06 68.23 14.8 68.41