Devon Island Lake DV09 150 Year Varved Sediment Data Gajewski, K.J.; Hamilton, P.; McNeely, R. Gajewski, K.J. Hamilton, P. McNeely, R. earth science/paleoclimate/paleolimnology (sulfur,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (manganese,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Neidium sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella sp.) earth science/paleoclimate/paleolimnology (potassium,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (calcium,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Staurosira sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,unspecified diatom) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Entomoneis sp.) earth science/paleoclimate/paleolimnology (oxygen,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (aluminum,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula sp.) earth science/paleoclimate/paleolimnology (age,null,null,year Common Era,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Gomphonema sp.) earth science/paleoclimate/paleolimnology (sodium,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (silicon,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diploneis sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia sp.) earth science/paleoclimate/paleolimnology (total diatoms,null,null,count per cubic centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (magnesium,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphora sp.) earth science/paleoclimate/paleolimnology (varve thickness,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (iron,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Staurosirella sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Eunotia sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella sp.) earth science/paleoclimate/paleolimnology (DV09>LATITUDE 75.57>LONGITUDE -89.31) Sediments from a 3 ha lake (75deg. 34.34'N, 89deg. 18.55'W) from the coastal region of northern Devon Island, Nunavut, Canada, contain discrete laminations in the deepest part of the basin. The laminations are varves as indicated by the correspondence between counts and thickness measurements of the couplets and Pb210 dating. A 14cm. core representing 150 years of sedimentation contained laminated couplets consisting of a lighter inorganic layer with a higher percentage of calcium and magnesium, alternating with fine darker bands, typically more cohesive, and comprising higher proportions of silica and carbon. A reddish oxidation zone with higher iron and aluminum frequently separates the laminations. The dark layer represents a biogenic component deposited summer and is made cohesive by bacterial filaments among other the particles. The light inorganic layer represents clastic deposition from allochthonous sources. Deposition rates were relatively consistent through the core with an increase in varve thickness in the 1950's. Diatom concentrations in the sediments increased by two orders of magnitude in this century, with major increases in the 1920's and 1950's. The increase in varve thickness and diatom abundance coincides with an increase in summer melt percentage in an ice core from the Devon Island Ice Cap (Koerner 1997). The relatively high sedimentation rate (0.15 cm/yr) coupled with the consistency of deposition makes this lake a significant indicator for recent climate changes of the Canadian Arctic Archipelago. STUDY NOTES: Sediment data from an unnamed lake designated DV09, 1.3 Km. from the northern coast of Devon Island. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Gajewski, K.J. Investigator : Hamilton, P. Investigator : McNeely, R. 2006-12-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5447 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/devon/dv09-1997.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/devon/dv09-1997.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/devon/dv09-1997.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/devon/dv09-1997.xls English https://www.ncdc.noaa.gov/paleo/study/5447 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/devon/dv09-1997.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/canada/devon/dv09-1997.xls Gajewski, K.J., P. Hamilton, R. McNeely. 1997. A high-resolution proxy-climate record from an arctic lake with annually-laminated sediments on Devon Island, Nunavut, Canada. Journal of Paleolimnology Vol. 17, pp.215-225 START YEAR: 107 cal yr BP * END YEAR: -43 cal yr BP -89.31 75.57 -89.31 75.57