Birch Lake, Alaska 13,000 Year Sediment Core Data Abbott, M.B. Abbott, M.B. earth science/paleoclimate/paleolimnology (density,wet sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,LOI at 500 degrees C) earth science/paleoclimate/paleolimnology (carbonate,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,LOI at 850 degrees C) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (density,dry sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Birch Lake, core D>LATITUDE 64.3>LONGITUDE -146.66667) Lake-level history for Birch Lake, Alaska, was reconstructed using seismic profiles and multiproxy sedimentary analyses including sedimentology, geochemistry, magnetic susceptibility, and palynology. Twenty-two seismic profiles (18 km total) and eight sediment cores taken from the lake margin to its depocenter at 13.5 m provide evidence for low lake stands during the late Pleistocene and Holocene. Thirty-one AMS radiocarbon dates of macrofossils and pollen provide a century-scale chronology. Prior to 12,700 14C yr B.P., the lake, which now overflows, was either seasonally dry or desiccated for prolonged periods, indicating a severe period of aridity. Lake level rose more than 18 m between 12,700 and 12,200 14C yr B.P. before falling to 17 m below the level of overflow. Between 11,600 and 10,600 14C yr B.P. the water remained between 14 and 17 m below the overflow level. Onlap sedimentary sequences were formed during a transgression phase between 10,600 and 10,000 14C yr B.P. Between 10,000 and about 8800 14C yr B.P. the lake was between 6 and 9 m below the overflow level. Lake level again rose, approaching the overflow level, between 8800 and 8000 14C yr B.P. Seismic and core evidence of minor erosional events suggest lowstands of 2-6 m until 4800 14C yr B.P. There have been no prolonged periods of lake-level depression since that time. The major restructuring of the climate system during deglaciation evidently generated a complex set of fluctuations in effective moisture in interior Alaska, which likely affected eolian processes and vegetation development, as well as lake levels. STUDY NOTES: Birch Lake, Alaska, Sediment Core Data, used by Abbott et al, 2000, for paleohydrology and lake level reconstructions. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Abbott, M.B. 2000-03-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5468 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_gh.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_f.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_i.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_c14.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_d.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/readme_abbott2000.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_gh.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_f.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_i.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_c14.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_d.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/readme_abbott2000.txt English https://www.ncdc.noaa.gov/paleo/study/5468 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_gh.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_f.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_i.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_c14.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake_core_d.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/birchlake.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/alaska/birchlake/readme_abbott2000.txt Abbott, M.B.. 2000. Lake-level Reconstructions and Paleohydrology of Birch Lake, Central Alaska Based on Seismic Reflection Profiles and Core Transects. Quaternary Research Vol. 53, No. 2, pp.154-166, March 2000 START YEAR: 10000 cal yr BP * END YEAR: 0 cal yr BP -146.66667 64.3 -146.66667 64.3