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  • Data  (13)
  • 2020-2024  (13)
Document type
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  • 1
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    Pollen and macro-charcoal analysis of Lake Relem sediment core, northern Patagonia (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: We present palaeoecological records of pollen and macro-charcoal particles used to reconstruct the vegetation and fire history of the Araucaria araucana forest close to the steppe. We obtained the core from a small lake (〈1ha, surface) located in 38°58'39"S; 71° 4'51"W, at 1268 m a.s.l. To process the pollen and macro-charcoal from the sediment samples, we followed Bennett and Willis (2001), and Withlock and Larsen (2001) protocols. We took 176 pollen samples of 0.5 cm3 along the core, avoiding tephra layers. The samples were not sieved. We counted at least 400 pollen grains per sample using a light microscope at 400-1000x. We extracted sub-samples of one cubic centimetre contiguously every centimetre and sieved in a 125 µm mesh. We counted the charcoal particles in a stereomicroscope.
    Keywords: Araucaria araucana; endangered species; Fire disturbance regime; forest-steppe ecotone; Livingstone piston sampler; LPS; Patagonia; Patagonian Andes; Relem; Vegetation dynamics
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Macro-charcoal analysis of Lake Relem sediment core, northern Patagonia (2020)
    PANGAEA
    Details
    Publication Date: 2023-04-14
    Description: We extracted sub-samples of one cubic centimetre contiguously every centimetre of the sediment core and sieved them in a 125 µm mesh. We counted the charcoal particles in a stereomicroscope.
    Keywords: AGE; Age, maximum/old; Age, minimum/young; Araucaria araucana; Calculated; Counting, microscope; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; endangered species; Fire disturbance regime; forest-steppe ecotone; Livingstone piston sampler; LPS; Macrocharcoal; Patagonia; Patagonian Andes; Relem; Vegetation dynamics; Volume, dry sample
    Type: Dataset
    Format: text/tab-separated-values, 2607 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Environmental variability at the margin of the South American Monsoon System recorded by a high-resolution sediment record from Lagoa Dourada (South Brazil) (2021)
    PANGAEA
    Details
    Publication Date: 2023-09-01
    Description: High-resolution geochemical and sedimentological data have been obtained for a lacustrine sediment record from Lagoa Dourada (South Brazil). Four distinctly different depositional processes were determined: (1) Suspension fallout of fine-grained minerogenic particles transferred via fluvial activity dominates the Early Holocene and relates to open grassland in the catchment area; (2) Activation of the karst hydrological system with deposition of massive sand layers indicates increased precipitation at the onset of the Middle Holocene; (3) Minerogenic sediments are replaced by organic deposition due to wetter climatic conditions with the expansion of woodlands in combination with release of dissolved nutrients due to enhanced pedogenesis during the Middle to Late Holocene; (4) Human-induced land-use change caused destabilization of soils in the catchment area with resulting cultural soil erosion between AD 1800 and 1950. These depositional trends are linked to intensity variations of the South American Monsoon System (SAMS). Century-long climatic events detected by data of high-resolution XRF scanning confirm this relationship and provide signals of the 8.2 and 4.2 ka events as well as of the Little Ice Age. These events document increased rainfall with complex responses of the environmental system. Our SAMS-induced consequences of past hydroclimatic variability on the environment of South Brazil provide background information for better evaluating model projections of future climate change.
    Keywords: 4.2 ka event; 8.2 ka event; Geochemistry; Holocene climate variability; human impact; hydroclimate; Little Ice Age; Soil erosion; South American Monsoon System; XRF scanning
    Type: Dataset
    Format: application/zip, 6 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Results of grain size analysis (Lagoa Dourada, S Brazil) (2021)
    PANGAEA
    Details
    Publication Date: 2023-09-01
    Keywords: 4.2 ka event; 8.2 ka event; Beckman Coulter Laser diffraction particle size analyzer LS 200; Clay; Depth, composite; Geochemistry; Grain size, mean; Holocene climate variability; human impact; hydroclimate; Lagoa_Dourada; Little Ice Age; Livingstone piston corer; LPC; Parana, Brazil, South America; Sand; Silt; Soil erosion; South American Monsoon System; XRF scanning
    Type: Dataset
    Format: text/tab-separated-values, 830 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Correlation of two sediment cores (LD17-A, LD17-B) from Lagoa Dourada (S Brazil) based on Ca data obtained by X-ray fluorescence (XRF) core scanning (2021)
    PANGAEA
    Details
    Publication Date: 2023-09-01
    Keywords: 4.2 ka event; 8.2 ka event; Calcium; DEPTH, sediment/rock; Geochemistry; Holocene climate variability; human impact; hydroclimate; Lagoa_Dourada; Little Ice Age; Livingstone piston corer; LPC; Parana, Brazil, South America; Soil erosion; South American Monsoon System; XRF scanning
    Type: Dataset
    Format: text/tab-separated-values, 12343 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Correlation of two sediment cores (LD17-A, LD17-B) from Lagoa Dourada (S Brazil) based on scanning of magnetic susceptibility (2021)
    PANGAEA
    Details
    Publication Date: 2023-09-01
    Keywords: 4.2 ka event; 8.2 ka event; Bartington MS2C sensor; Depth, composite; DEPTH, sediment/rock; Geochemistry; Holocene climate variability; human impact; hydroclimate; Lagoa_Dourada; Little Ice Age; Livingstone piston corer; LPC; Magnetic susceptibility; Parana, Brazil, South America; Soil erosion; South American Monsoon System; XRF scanning
    Type: Dataset
    Format: text/tab-separated-values, 6115 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Organic chemical parameters (Lagoa Dourada, S Brazil) (2021)
    PANGAEA
    Details
    Publication Date: 2023-09-01
    Keywords: 4.2 ka event; 8.2 ka event; Biogenic silica; Carbon, total; Carbon/Nitrogen ratio; Depth, composite; Element analyser CNS, EURO EA; Geochemistry; Holocene climate variability; human impact; hydroclimate; Lagoa_Dourada; Little Ice Age; Livingstone piston corer; LPC; Nitrogen, total; Parana, Brazil, South America; Soil erosion; South American Monsoon System; Sulfur, total; XRF scanning
    Type: Dataset
    Format: text/tab-separated-values, 1029 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Radiocarbon ages for the Holocene sediment record from Lagoa Dourada (S Brazil) (2021)
    PANGAEA
    Details
    Publication Date: 2023-09-01
    Keywords: 4.2 ka event; 8.2 ka event; Age, 14C AMS; Age, 14C milieu/reservoir corrected; Age, dated; Age, dated material; Age, error; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Calendar age, standard error; Comment; Core; Depth, bottom/max; Depth, composite; DEPTH, sediment/rock; Depth, top/min; Geochemistry; Holocene climate variability; human impact; hydroclimate; Laboratory code/label; Lagoa_Dourada; Little Ice Age; Livingstone piston corer; LPC; Parana, Brazil, South America; Sample ID; Soil erosion; South American Monsoon System; XRF scanning
    Type: Dataset
    Format: text/tab-separated-values, 285 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 9
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    Pollen composition of Lake Relem sediment core, northern Patagonia (2020)
    PANGAEA
    Details
    Publication Date: 2024-03-06
    Description: To process the pollen and macro-charcoal from the sediment samples, we followed Bennett and Willis (2002), and Withlock and Larsen (2002) protocols. We took 176 pollen samples of 0.5 cm³ along the core, avoiding tephra layers. The samples were not sieved. At least 400 pollen grains per sample were counted using a light microscope at 400-1000x.
    Keywords: Acaena; Adesmia; Alnus glutinosa; Alonsoa; Amaranthaceae; Apiaceae undifferentiated; Araucaria araucana; Aristotelia chilensis; Austrocedrus chilensis; Azara; Azorella; Balbisia; Brassicaceae; Caryophyllaceae; cf. Buddleja; cf. Cacabus; cf. Cryptocarya; cf. Diposis; cf. Glandularia; cf. Glimus radiata; cf. Gomphrena; cf. Hymenophyllum; cf. Laurelia; cf. Lilaea; cf. Loasa; cf. Loranthaceae; cf. Persea; cf. Porlieria; cf. Schyzantus; cf. Tropaeolum; Cichorioideae; Colliguaja; Counting, palynology; Cyperaceae; DEPTH, sediment/rock; Discaria; Drimys winteri; Embothrium coccineum; endangered species; Ephedra; Equinideae; Eryngium; Escallonia; Eucryphia; Euphorbiaceae; Fabaceae; Fire disturbance regime; forest-steppe ecotone; Fragaria; Fuchsia; Galium-type; Gaultheria; Gentianaceae; Gunnera; Hydrangea; Iridaceae/Liliaceae; Lathyrus; Livingstone piston sampler; Lomatia hirsuta; Lophosoria; LPS; Lycopodium cf. magellanicum; Maytenus; Misodendrum; Muehlenbeckia; Mulinum; Mutisia; Myrtaceae; Nassauvia; Nothofagus dombeyi-type; Nothofagus obliqua-type; Patagonia; Patagonian Andes; Peumus boldo; Pinus; Plantago lanceolata; Plumbaginaceae; Poaceae; Podocarpus; Polygonaceae; Polypodium feuillei; Prumnopitys andina; Pteridophyta, monolete; Pteridophyta, monolete indeterminata; Pteridophyta, trilete indeterminata; Quinchamalium chilensis; Relem; Ribes; Rumex acetosella; Sanicula; Saxegothaea conspicua; Schinus patagonicus; Solanaceae; Spergularia-type; Tetilla; Urticaceae; Valeriana; Vegetation dynamics; Verbenaceae; Vicia; Viola cf. volcanica; Viviania; Wahlenbergia linarioides; Weinmannia trichosperma
    Type: Dataset
    Format: text/tab-separated-values, 17600 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 10
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    Holocene changes in forest composition in northern Patagonia responded to climate with little impact of disturbance (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-05
    Description: Here we present pollen and charcoal counts from a small lake located within the Lanín National Park, Argentina (40°12'S; 71°30'W; 1095 m a.s.l). The lacustrine sediment core was retrieved in January 2017. Pollen samples of 0.5 cm^3 were taken every 2 cm, avoiding tephra sections. Before and after major tephra layers the sampling was carried out at an interval of 1 cm. Processing of samples for pollen analysis was conducted following Bennett and Willis (2001; doi:10.1007/0-306-47668-1), including hydrofluoric acid and acetolysis. Samples with coarse particles were sieved at 120 µm. To reconstruct the past fire regime, macroscopic charcoal particles were counted in 1 cm^3 samples contiguously along the core at 1 cm intervals avoiding tephra layers wider than 1 cm. The samples were processed according to the methodology by Stevenson and Haberle (2005; hdl:1885/144170). Particles 〉 125 µm were counted under a binocular dissecting microscope (Whitlock and Anderson, 2003; doi:10.1007/0-387-21710-X_1).
    Keywords: charcoal; Chile; northern Patagonia; Nothofagus obliqua; Pollen
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
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