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  • Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; Aconitum; Alnus incana; Alnus viridis; Amaranthaceae/Chenopodiaceae; Ambrosia; Andromeda; Androsace; Apiaceae; Arctostaphylos uva-ursi; Artemisia; Asteraceae; Astragalus; Betula; Botrychium; Brassicaceae; Bupleurum; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Caryophyllaceae; Cassiope; Classical age-modeling approach, CLAM (Blaauw, 2010); Cnidium; Counting, palynology; Cyperaceae; Cystopteris; DEPTH, sediment/rock; Dodecatheon; Douglasia; Dryas; Empetrum; Epilobium; Equisetum; Ericaceae; Ericales; Fabaceae; Galium; Gentiana; Geum; Hanging_Lake; Hedysarum; Hippuris vulgaris; Huperzia selago; Lagotis glauca; Ledum; Lesquerella; Liliaceae; Linnaea borealis; Lupinus; Lycopodiaceae; Lycopodium annotinum; Lycopodium clavatum; Lycopodium complanatum; Lycopodium obscurum; Mertensia-type; Myrica; Oxyria digyna; Oxytropis; Pedicularis lanceolata; Phlox; Picea; Pinus; Plantago canescens; Plantago major; Poaceae; Polemonium; Pollen indeterminata; Polygonum viviparum; Polypodiaceae; Populus; Potamogeton; Potentilla; Pyrola; Ranunculaceae; Rosaceae; Rubus chamaemorus; Rumex; Salix; Sample ID; Saussurea; Saxifragaceae; Saxifraga cernua; Saxifraga hieracifolia; Saxifraga tricuspidata; Selaginella sibirica; Shepherdia canadensis; Sparganium; Sphagnum; Spiraea; Thalictrum; Tofieldia; Triglochin; Type of age model; Typha latifolia; Unknown; Vaccinium; Valeriana  (1)
  • Ceratopogonidae  (1)
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  • 1
    ISSN: 1573-0417
    Keywords: Ceratopogonidae ; Chironomidae ; Chaoborus ; weighted averaging ; weighted averaging partial least squares ; temperature optima ; error estimates ; palaeoclimate ; late-glacial ; Younger Dryas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Using an expanded surface sample data set, representing lakes distributed across a transect from southernmost Canada to the Canadian High Arctic, a revised midge-palaeotemperature inference model was developed for eastern Canada. Modelling trials with weighted averaging (with classical and inverse deshrinking; with and without tolerance downweighting) and weighted averaging partial least squares (WA-PLS) regression, with and without square-root transformation of the species data, were used to identify the best model. Comparison of measured and predicted temperatures revealed that a 2 component WA-PLS model for square-root transformed percentage species data provided the model with the highest explained variance (r $$_{jack}^2 $$ = 0.88) and the lowest error estimate (RMSEP jack  = 2.26 °C). Comparison of temperature inferences based on the new and old models indicates that the original model may have seriously under-estimated the magnitude of late-glacial temperature oscillations in Atlantic Canada. The new inferences suggest that summer surface water temperatures in Splan Pond, New Brunswick were approximately 10 to 12 °C immediately following deglaciation and during the Younger Dryas. During the Allerod and early Holocene, surface water temperatures of 20 to 24 °C were attained. The new model thus provides the basis for more accurate palaeotemperature reconstructions throughout easternmost Canada.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2024-05-27
    Keywords: Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; Aconitum; Alnus incana; Alnus viridis; Amaranthaceae/Chenopodiaceae; Ambrosia; Andromeda; Androsace; Apiaceae; Arctostaphylos uva-ursi; Artemisia; Asteraceae; Astragalus; Betula; Botrychium; Brassicaceae; Bupleurum; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Caryophyllaceae; Cassiope; Classical age-modeling approach, CLAM (Blaauw, 2010); Cnidium; Counting, palynology; Cyperaceae; Cystopteris; DEPTH, sediment/rock; Dodecatheon; Douglasia; Dryas; Empetrum; Epilobium; Equisetum; Ericaceae; Ericales; Fabaceae; Galium; Gentiana; Geum; Hanging_Lake; Hedysarum; Hippuris vulgaris; Huperzia selago; Lagotis glauca; Ledum; Lesquerella; Liliaceae; Linnaea borealis; Lupinus; Lycopodiaceae; Lycopodium annotinum; Lycopodium clavatum; Lycopodium complanatum; Lycopodium obscurum; Mertensia-type; Myrica; Oxyria digyna; Oxytropis; Pedicularis lanceolata; Phlox; Picea; Pinus; Plantago canescens; Plantago major; Poaceae; Polemonium; Pollen indeterminata; Polygonum viviparum; Polypodiaceae; Populus; Potamogeton; Potentilla; Pyrola; Ranunculaceae; Rosaceae; Rubus chamaemorus; Rumex; Salix; Sample ID; Saussurea; Saxifragaceae; Saxifraga cernua; Saxifraga hieracifolia; Saxifraga tricuspidata; Selaginella sibirica; Shepherdia canadensis; Sparganium; Sphagnum; Spiraea; Thalictrum; Tofieldia; Triglochin; Type of age model; Typha latifolia; Unknown; Vaccinium; Valeriana
    Type: Dataset
    Format: text/tab-separated-values, 12350 data points
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