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  • 1
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    Unknown
    Age determination and glacier model for a small ice cap on Baffin Island (2017)
    PANGAEA
    In:  Supplement to: Pendleton, Simon; Miller, Gifford H; Anderson, Robert A; Crump, Sarah E; Zhong, Yafang; Jahn, Alexandra; Geirsdóttir, Áslaug (2017): Episodic Neoglacial expansion and rapid 20th Century retreat of a small ice cap on Baffin Island, Arctic Canada and modeled temperature change. Climate of the Past Discussions, 1-15, https://doi.org/10.5194/cp-2017-27
    Details
    Publication Date: 2023-01-13
    Description: Records of Neoglacial glacier activity in the Arctic constructed from moraines are often incomplete due to a preservation bias toward the most extensive advance, usually the Little Ice Age. Recent warming in the Arctic has caused extensive retreat of glaciers over the past several decades, exposing preserved landscapes complete with in situ tundra plants previously entombed by ice. The radiocarbon ages of these plants define the timing of snowline depression and glacier advance across the site, in response to local summer cooling. Although most dead plants recently exposed by ice retreat are rapidly removed from the landscape by erosion, where erosive processes are unusually weak, dead plants may remain preserved on the landscape for decades. In such settings, a transect of plant radiocarbon ages can be used to construct a near-continuous chronology of past ice margin advance. Here we present radiocarbon dates from the first such transect on Baffin Island, which directly dates the advance of a small ice cap over the past two millennia. The nature of ice expansion between 20 BCE and ~1000 CE is still uncertain, but episodic advances at ~1000, ~1200, and ~1500 CE led to the maximum Neoglacial dimensions ~1900 CE. We employ a two-dimensional numerical glacier model to reconstruct the pattern of ice expansion inferred from the radiocarbon ages and to explore the sensitivity of the ice cap to temperature change. Model experiments show that at least ~0.44 °C of cooling over the past 2 ka is required for the ice cap to reach its 1900 margin, and that the period from ~1000 to 1900 CE must have been at least 0.25 °C cooler than the previous millennium; results that agree with regional climate model simulations. However, ~3 °C of warming since 1900 CE is required to explain retreat to its present position, and, at the same rate of warming, the ice cap will disappear before 2100 CE.
    Keywords: Baffin Island; Divide_Ice_Cap; ICEM; Ice measurement
    Type: Dataset
    Format: application/zip, 754.2 kBytes
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    brGDGT distributions and environmental parameters of lake sediments from the Eastern Canadian Arctic and Iceland, 2003-2019 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-12
    Description: This dataset contains fractional abundances of the 15 commonly-measured branched glycerol dialkyl glycerol tetraether (brGDGT) lipids in 43 lake surface sediments. It also contains 5 air temperature variables (mean annual temperature (MAT); mean air temperature of months above freezing (MAF); warmest month temperature (WMT); mean summer temperature (MST); summer warmth index (SWI)), mean lake water conductivity, pH, and dissolved oxygen, and minimum dissolved oxygen. Finally, it contains basic lake parameters, including coordinates, maximum lake water depth, and approximate surface area.
    Keywords: 1345; 3_Lakes_North; Africa; Africa_Lake; Albert; Alice_Lake; Arnuiq; Asia; Ataata; Baejarvotn; Baiyangdian; Baldeggersee; Bandasa; Batoda; Berufjardarvtn; Bigata; Biomarker; Birch; brGDGTs; Brother_of_Fog; Bugwagi; Bukurungu_East; Burton_Lake; Calculated; Canada; Canovasee; Central Europe; Cetian; Chibwera; China; Clyde_Forelands_3; Clyde_Forelands_8; Conductivity, electrical; Daihai_avg; Dalongwan_a; DEPTH, water; Donghu; Edward_Lake; Eldoret_Nakuru_2; Ellis; Enchanted; Engstlensee; Erlongwan_a; Europe; Event label; Faelensee; Fenghe_b; Gallery_Tarn; Garlate_Lake; Gedduvatn; Gerzensee; Glattalpsee; Global River Discharge; Glycerol dialkyl glycerol tetraethers, fractional abundance Ia; Glycerol dialkyl glycerol tetraethers, fractional abundance Ib; Glycerol dialkyl glycerol tetraethers, fractional abundance Ic; Glycerol dialkyl glycerol tetraethers, fractional abundance IIa; Glycerol dialkyl glycerol tetraethers, fractional abundance IIa'; Glycerol dialkyl glycerol tetraethers, fractional abundance IIb; Glycerol dialkyl glycerol tetraethers, fractional abundance IIb'; Glycerol dialkyl glycerol tetraethers, fractional abundance IIc; Glycerol dialkyl glycerol tetraethers, fractional abundance IIc'; Glycerol dialkyl glycerol tetraethers, fractional abundance IIIa; Glycerol dialkyl glycerol tetraethers, fractional abundance IIIa'; Glycerol dialkyl glycerol tetraethers, fractional abundance IIIb; Glycerol dialkyl glycerol tetraethers, fractional abundance IIIb'; Glycerol dialkyl glycerol tetraethers, fractional abundance IIIc; Glycerol dialkyl glycerol tetraethers, fractional abundance IIIc'; GONGHAI; Gonghai Lake; Greifensee_; Grimselsee; Gripdeild; Guanting; Hanging_Tarn; Harris_Tarn; Haukadalsvatn; Hausburg_Tarn; Heidarvatn_Lake; Hinterburgsee; Hinterer_Schwendisee; Hognavatn; Hut_Tarn; Hvalarvatn; HydroLab HL4 (OTT HydroMet); Ibamba; Iceland; Iffigsee; IFFIGSEE; Irene; Kacuba; Kako; Kamweru; Kanyabutetere; Kanyanchu; Kasirya; Katanda; Katunda; Kekerturnak_Lake; Kifuruka; Kisibendi; Kitere; Kivitoo_Highlands_Lake; Kloentalersee; Kopello; Kyasunduka; Kyerbwato; Kyogo; Lago_Alzasca; Lago_Cadagno; Lago_Cama; Lago_Dosso; Lago_Endine; Lago_Ledro; Lago_Lugano; Lago_Mognola; Lago_Poschiavo; Lago_Ritom; Lago_Silvaplana; Lago-Ghirla; Lake_Caizi; Lake_Chagan; Lake_Chang; Lake_Changdang; Lake_Chao; Lake_Dongping; Lake_Dushan; Lake_Gaoyou; Lake_Hengshui; Lake_Hong; Lake_Hongze; Lake_Hulun; Lake_Liangzi; Lake_Longgan; Lake_Luoma; Lake_Qinghai_avg; Lake_Shijiu; Lake_Weishan; Lake_Wolong; Lake_Wuchang; Lake_Yangcheng; Lake_zhenzhu; Lake sediment; Lake surface area; Large_Hall_Tarn; Latitude of event; Lauerzersee; Ledge_Lake; Leirvogsvatn; Lewis_Tarn; Litla_Vidarvatn; Location of event; Longitude of event; Longquanlongwan_a; Loon_Lake; Lower_Simba; Lungerensee; MAHOMA; Mahoma Lake; Mahuhura; Margaretarvatn; Masvatn; Mbajo; Mbugo; Middle_Kachope; Middle_Lake; Midheidarvatn_East; Midheidarvatn_West; Mirambi; MULT; Multiple investigations; Murabio; Murusi; Mwengenyi; Namtso_avg; Nanlongwan_a; Nanyuki_Tarn; Neuenburgersee; Njarayabana; Nkugute; Nkuruba; Nyamswiga; Nyamugosani; Nyamusingere; Nyantonde; Oblong_Tarn; Oeschinensee; Organic Geochemistry; Oxygen, dissolved; paleoclimate proxy; pH; Qaupat; Reference/source; RGS; River gauging station; Rotsee; Ruhandika; Rutundu; Sauravatn; Silsersee; Skjaldarvatn; Skorarvatn; Skufnavotn; Small_Hall_Tarn; Soppensee; South_America_Lake; Spot_Lake; Square_Tarn; Stora_Vidarvatn; Summer warmth index; Svartargilsvatn; Svinavatn; Systravatn; Tanganyika; Teleki_Tarn; Temperature; Temperature, air, mean of months, above freezing; Temperature, air, monthly standard deviation; Temperature, annual mean; Temperature, summer mean; Temperature, warmest month; Thermo Scientific UltiMate 3000 high-performance liquid chromatography instrument coupled to a Q Exactive Focus Orbitrap-Quadrupole high-resolution mass spectrometer (HPLC-MS); Thompson; Thunersee; Torfavatn; Torfdalsvatn; Trollkonuvatn; Truebsee; Veggie_Tarn; Vestra_Gisholtsvatn; Vierwaldstaettersee; Wandakara; Wankenzi; Wuliangsuhai; Xidayang; Ximenglongtan; Yonding, China, Asia; Yuqiao; Zuerichsee
    Type: Dataset
    Format: text/tab-separated-values, 4711 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Lake Sedimentary DNA Research on Past Terrestrial and Aquatic Biodiversity: Overview and Recommendations (2021)
    In:  EPIC3Quaternary, 4(1), pp. 6-6, ISSN: 2571-550X
    Details
    Publication Date: 2024-06-19
    Description: The use of lake sedimentary DNA to track the long-term changes in both terrestrial and aquatic biota is a rapidly advancing field in paleoecological research. Although largely applied nowadays, knowledge gaps remain in this field and there is therefore still research to be conducted to ensure the reliability of the sedimentary DNA signal. Building on the most recent literature and seven original case studies, we synthesize the state-of-the-art analytical procedures for effective sampling, extraction, amplification, quantification and/or generation of DNA inventories from sedimentary ancient DNA (sedaDNA) via high-throughput sequencing technologies. We provide recommendations based on current knowledge and best practises
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Location Call Number Limitation Availability
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    PAPER (OA)
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