Vestfirðir Peninsula, Iceland Holocene Lake Sediment Data Harning, D.J.; Geirsdóttir, A.; Miller, G.H. Harning, D.J. Geirsdóttir, A. Miller, G.H. earth science/paleoclimate/paleolimnology (density,sediment,null,kilogram per cubic meter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,present defined as 1950 CE) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 13C,sediment,null,per mil VPDB,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,relative unit,null,paleolimnology,null,fourier transform infrared spectroscopy,N,absorbance units) earth science/paleoclimate/paleolimnology (magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,composited|normalized,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,dead vegetation age) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,dead vegetation age probability density function) earth science/paleoclimate/paleolimnology (carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,relative unit,null,paleolimnology,composited|normalized,fourier transform infrared spectroscopy,N,absorbance units) earth science/paleoclimate/paleolimnology (organic carbon,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Skorarvatn>LATITUDE 66.25627>LONGITUDE -22.32213) (Tröllkonuvatn>LATITUDE 66.14252>LONGITUDE -22.05607) Emerging Holocene paleoclimate datasets point to a non-linear response of Icelandic climate against a background of steady orbital cooling. The Vestfirðir peninsula (NW Iceland) is an ideal target for continued climate reconstructions due to the presence of a small ice cap (Drangajökull) and numerous lakes, which provide two independent means to evaluate existing Icelandic climate records and to constrain the forcing mechanisms behind centennial-scale cold anomalies. Here, we present new evidence for Holocene expansions of Drangajökull based on 14C dates from entombed dead vegetation as well as two continuous Holocene lake sediment records. Lake sediments were analyzed for both bulk physical (MS) and biological (%TOC, d13C, C/N, and BSi) parameters. Composite BSi and C/N records from the two lakes yield a sub-centennial qualitative perspective on algal (diatom) productivity and terrestrial landscape stability, respectively. The Vestfirðir lake proxies suggest initiation of the Holocene Thermal Maximum by ~8.8 ka with subsequent and pronounced cooling not apparent until ~3 ka. Synchronous periods of reduced algal productivity and accelerated landscape instability point to cold anomalies centered at ~8.2, 6.6, 4.2, 3.3, 2.3, 1.8, 1, and 0.25 ka. Triggers for cold anomalies are linked to variable combinations of freshwater pulses, low total solar irradiance, explosive and effusive volcanism, and internal modes of climate variability, with cooling likely sustained by ocean/sea-ice feedbacks. The climate evolution reflected by our glacial and organic proxy records corresponds closely to marine records from the North Iceland Shelf. STUDY NOTES: Holocene sediment geochemical (C/N, TOC, BSi), physical properties (MS, density), and carbon isotope (d13C) data from 2 lakes on the Vestfirðir Peninsula, Iceland. Composited and normalized BSi and C/N series from the two lakes, plus dead vegetation ages, are also presented. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Harning, D.J. Investigator : Geirsdóttir, A. Investigator : Miller, G.H. 2018-08-20 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/24930 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/trollkonuvatn2018.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018bsi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/skorarvatn2018.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018cn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018deadveg.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/trollkonuvatn2018.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018bsi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/skorarvatn2018.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018cn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018deadveg.txt English https://www.ncdc.noaa.gov/paleo/study/24930 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/trollkonuvatn2018.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018bsi.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/skorarvatn2018.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018cn.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018deadveg.txt David J. Harning, Áslaug Geirsdóttir, Gifford H. Miller2018Punctuated Holocene climate of Vestfirðir, Iceland, linked to internal/external variables and oceanographic conditionsQuaternary Science Reviews18931-4210.1016/j.quascirev.2018.04.009https://www.sciencedirect.com/science/article/pii/S0277379117309563 START YEAR: 10283 cal yr BP * END YEAR: -67 cal yr BP -22.32213 66.14252 -22.05607 66.25627