noaa-lake-24930 Vestfirðir Peninsula, Iceland Holocene Lake Sediment Data Harning, D.J.; Geirsdóttir, A.; Miller, G.H. Vestfirðir Peninsula, Iceland Holocene Lake Sediment Data 2018-08-20 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/24930 Investigator D.J. Harning Investigator A. Geirsdóttir Investigator G.H. Miller 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 age control earth science paleoclimate paleolimnology carbon isotopes earth science paleoclimate paleolimnology physical properties earth science paleoclimate paleolimnology geochemistry geoscientificInformation 10283 cal yr BP -67 cal yr BP Complete 66.14252 66.25627 -22.32213 -22.05607 183 366 Continent Europe Northern Europe Iceland Skorarvatn>LATITUDE 66.25627>LONGITUDE -22.32213 Continent Europe Northern Europe Iceland Tröllkonuvatn>LATITUDE 66.14252>LONGITUDE -22.05607 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

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Boulder CO 80305-3328 USA online ASCII David J. Harning, Áslaug Geirsdóttir, Gifford H. Miller 2018 Quaternary Science Reviews 189 31-42 10.1016/j.quascirev.2018.04.009 https://www.sciencedirect.com/science/article/pii/S0277379117309563

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/trollkonuvatn2018.txt NOAA Template File; Tröllkonuvatn Sediment Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018bsi.txt NOAA Template File; Vestfirðir Composite Biogenic Silica Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/skorarvatn2018.txt NOAA Template File; Skorarvatn Sediment Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018cn.txt NOAA Template File; Vestfirðir Composite Carbon/Nitrogen Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018deadveg.txt NOAA Template File; Vestfirðir Dead Vegetation Ages USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11