noaa-lake-15655 Harding Lake, Alaska 31,000 Year Geochemical Data Finkenbinder, M.S.; Abbott, M.B.; Edwards, M.E.; Langdon, C.T.; Steinman, B.; Finney, B.P. Harding Lake, Alaska 31,000 Year Geochemical Data 2013-12-09 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/15655 Investigator M.S. Finkenbinder Investigator M.B. Abbott Investigator M.E. Edwards Investigator C.T. Langdon Investigator B. Steinman Investigator B.P. Finney earth science paleoclimate paleolimnology volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,composited,null,N,x10-5 units; Composite core (C-10 / D-10 / E-10) earth science paleoclimate paleolimnology volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,null,N,x10-5 units earth science paleoclimate paleolimnology biogenic silica,sediment,null,percent,null,paleolimnology,composited,null,N,Composite core (C-10 / D-10 / E-10) earth science paleoclimate paleolimnology titanium,sediment,null,count per second,null,paleolimnology,composited,energy-dispersive x-ray fluorescence spectroscopy,N,Composite core (C-10 / D-10 / E-10) earth science paleoclimate paleolimnology delta 13C,organic matter,null,per mil VPDB,null,paleolimnology,composited,null,N,Composite core (C-10 / D-10 / E-10) earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology organic matter,sediment,null,weight percent,null,paleolimnology,composited,loss on ignition,N,550 degrees C; Composite core (C-10 / D-10 / E-10) earth science paleoclimate paleolimnology density,dry sediment,null,gram per cubic centimeter,null,paleolimnology,composited,null,N,Composite core (C-10 / D-10 / E-10) earth science paleoclimate paleolimnology carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,composited,null,N,Composite core (C-10 / D-10 / E-10); total organic carbon/total nitrogen earth science paleoclimate paleolimnology density,dry sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology organic matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,550 degrees C earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology magnetic susceptibility earth science paleoclimate paleolimnology carbon isotopes earth science paleoclimate paleolimnology physical properties earth science paleoclimate paleolimnology geochemistry geoscientificInformation 32617 cal yr BP -56 cal yr BP Complete 64.42 64.42 -146.85 -146.85 217 217 Continent North America United States Of America Alaska Harding Lake>LATITUDE 64.42>LONGITUDE -146.85 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Matthew S.Finkenbinder, Mark B.Abbott, Mary E.Edwards, Catherine T.Langdon, Byron A.Steinman, Bruce P.Finney 2014 Quaternary Science Reviews 87 98-113 10.1016/j.quascirev.2014.01.005 https://www.sciencedirect.com/science/article/pii/S0277379114000067

Physical and geochemical proxy analyses of sediment cores from Harding Lake in central Alaska Alaska are used to reconstruct paleoenvironmental change and millennial scale fluctuations in lake level for the last ~ 31,000 years. We analyzed a composite 422 cm core from the lake depocenter (42.1 m water depth) and identified 4 distinct lithologic units based on variability in dry bulk density, organic matter, biogenic silica, carbon to nitrogen (C/N) mass ratios, organic matter carbon (d13C) isotopes, pollen, and elemental abundances via scanning X-ray fluorescence, with age control provided by 16 Accelerator Mass Spectrometry radiocarbon dates and 210Pb dating. In addition, we analyzed a transect of cores from 7.1m, 10.75m, 15.91m, and 38.05m water depths to identify lake level fluctuations and to characterize shallow water sediments. Organic matter content and magnetic susceptibility values in surface sediments from all transect cores show a strong correlation with water depth. Interpretation of four dated lithologic units produced a record of water-depth variations that is consistent with independent climate records from eastern Beringia. Basal coarse grained sediments (quartz pebble diamicton) were deposited prior to 30,700 calendar years before present (yr BP), possibly due to fluvial reworking or deflation during a period of severe aridity. Unit 1 sediments were deposited between 30,700 and 15,700 yr BP and are characterized by a low organic matter content, a high magnetic susceptibility, and low biogenic silica concentrations resulting from very low lake levels, low terrestrial and in-lake productivity and a significant flux of clastic sediment. An abrupt increase in organic matter and biogenic silica marks the transition into Unit 2 sediments, which were deposited between 15,700 and 9,400 yr BP when lake levels were higher and variable (relative to Unit 1). Unit 3 sediments began forming at 9,400 yr BP, indicating the final transition to full interglacial conditions. Here an abrupt increase in the sedimentation rate, organic matter content, and biogenic silica occurs (along with a corresponding decrease to low magnetic susceptibility). These high values persist until 8,700 yr BP, signifying a rapid rise to higher lake levels (in comparison to Units 1 and 2). Unit 4 sediments were deposited between 8,700 yr BP to 2010 AD and contain generally high concentrations of organic matter and biogenic silica with low magnetic susceptibility, suggesting that lake levels were relatively high and stable during the middle to late Holocene. STUDY NOTES: Geochemical data from Harding Lake, Alaska for the last 30,700 yr BP. Data include dry bulk density, percent organic matter, percent biogenic silica, magnetic susceptibility, carbon to nitrogen (C/N) mass ratios, bulk sediment organic matter carbon isotopes (d13C), pollen, and elemental abundances.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014c10ms.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014bio-si.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014e12.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014dbd-loi.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014a12.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014.xlsx GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014d10ms.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014f10.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014ti.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014b10.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014e10ms.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014ms.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014carbon.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/alaska/harding2014pollen.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11