# Vestfirðir Peninsula, Iceland Holocene Lake Sediment Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/24930 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/europe/iceland/vestfiroir2018cn.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleolimnology # # Dataset DOI: # # Parameter_Keywords: carbon isotopes, geochemistry, magnetic susceptibility, physical properties #-------------------- # Contribution_Date # Date: 2018-08-20 #-------------------- # File_Last_Modified_Date # Date: 2018-08-20 #-------------------- # Title # Study_Name: Vestfirðir Peninsula, Iceland Holocene Lake Sediment Data #-------------------- # Investigators # Investigators: Harning, D.J.; Geirsdóttir, Á.; Miller, G.H. #-------------------- # Description_Notes_and_Keywords # Description: 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. #-------------------- # Publication # Authors: David J. Harning, Áslaug Geirsdóttir, Gifford H. Miller # Published_Date_or_Year: 2018-06-01 # Published_Title: Punctuated Holocene climate of Vestfirðir, Iceland, linked to internal/external variables and oceanographic conditions # Journal_Name: Quaternary Science Reviews # Volume: 189 # Edition: # Issue: # Pages: 31-42 # Report_Number: # DOI: 10.1016/j.quascirev.2018.04.009 # Online_Resource: https://www.sciencedirect.com/science/article/pii/S0277379117309563 # Full_Citation: # Abstract: 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. #------------------ # Funding_Agency # Funding_Agency_Name: Icelandic Center for Research # Grant: 163431051, 130775051, 141573052 #------------------ # Site_Information # Site_Name: Tröllkonuvatn # Location: Europe>Northern Europe>Iceland # Country: Iceland # Northernmost_Latitude: 66.14252 # Southernmost_Latitude: 66.14252 # Easternmost_Longitude: -22.05607 # Westernmost_Longitude: -22.05607 # Elevation: 366 m #------------------ # Data_Collection # Collection_Name: Vestfiroir2018CN # Earliest_Year: 9020 # Most_Recent_Year: -64 # Time_Unit: Cal. Year BP # Core_Length: 4.5 # Notes: #------------------ # Chronology_Information # Chronology: # # # Table 3. Lake sediment radiocarbon information. # # Lake (sediment depth, cm) Lab ID Material d13C (permil) Fraction modern Conventional 14C date ± Sigma Calibrated age BP ±Sigma Reference # Skorarvatn (43) CURL-21039 moss -24.3 0.6102 3970 ± 20 4460 ± 50 Harning et al. (2016b) # Skorarvatn (59) CURL-21034 moss -25.3 0.5529 4760 ± 20 5530 ± 50 Harning et al. (2016b) # Skorarvatn (82) CURL-21035 moss -26.3 0.5136 5355 ± 20 6120 ± 90 Harning et al. (2016b) # Skorarvatn (140.5) CURL-21036 moss -29.7 0.4079 7205 ± 25 8000 ± 20 Harning et al. (2016b) # Skorarvatn (214.8) CURL-19489 moss -23.9 0.356 8295 ± 25 9340 ± 60 Harning et al. (2016b) # Skorarvatn (222.5) CURL-21041 moss -23.3 0.33 8905 ± 35 10060 ± 120 Harning et al. (2016b) # Skorarvatn (283.5) CURL-21033 moss -25.0 0.3203 9145 ± 35 10300 ± 70 Harning et al. (2016b) # Tröllkonuvatn (18) CURL-19503 moss -22.2 0.9348 540 ± 15 540 ± 10 Harning et al. (2016a) # Tröllkonuvatn (30.5) UCIAMS-165968 moss N/A 0.8686 1130 ± 20 1020 ± 50 Harning et al. (2016a) # Tröllkonuvatn (165.5) CURL-21038 moss -21.6 0.6333 3670 ± 15 4020 ± 50 Harning et al. (2018) # Tröllkonuvatn (285.5) CURL-21037 moss -23.1 0.4858 5800 ± 20 6610 ± 40 Harning et al. (2018) # Tröllkonuvatn (394) CURL-19502 moss -24.4 0.3729 7925 ± 25 8750 ± 100 Harning et al. (2016b) # # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## age age, , , calendar years before present, , , , ,N,present defined as 1950 CE ## C/N carbon/nitrogen, sediment, , , ,paleolimnology,,,N,normalized composite C/N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age C/N -64 1.493308177 -43.98986784 1.531119332 -23.97973568 1.360876457 -3.969603524 1.030390731 16.04052863 1.031363494 36.05066079 1.217511586 56.06079295 1.171609222 76.07092511 0.999416188 96.08105727 0.715812503 116.0911894 0.627975682 136.1013216 0.55138052 156.1114537 0.715587271 176.1215859 0.778343792 196.1317181 0.592274415 216.1418502 0.529979794 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