Sedimentaology, pollen profile, and climate reconstruction on a sediment core from Trou Lake, Yukon, Canada ...

• Main Authors: Fritz, Michael, Herzschuh, Ulrike, Wetterich, Sebastian, Lantuit, Hugues, De Pascale, Gregory P, Pollard, Wayne H, Schirrmeister, Lutz
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2015
• Subjects: Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; permafrost; Tundra; Beringia; Yukon
• Online Access: https://dx.doi.org/10.1594/pangaea.845807; https://doi.pangaea.de/10.1594/PANGAEA.845807

Beringian climate and environmental history are poorly characterized at its easternmost edge. Lake sediments from the northern Yukon Territory have recorded sedimentation, vegetation, summer temperature and precipitation changes since ~16 cal ka BP. Herb-dominated tundra persisted until ~14.7 cal ka BP with mean July air temperatures less than or equal to 5 °C colder and annual precipitation 50 to 120 mm lower than today. Temperatures rapidly increased during the Bølling/Allerød interstadial towards modern conditions, favoring establishment of Betula-Salix shrub tundra. Pollen-inferred temperature reconstructions recorded a pronounced Younger Dryas stadial in east Beringia with a temperature drop of ~1.5 °C (~2.5 to 3.0 °C below modern conditions) and low net precipitation (90 to 170 mm) but show little evidence of an early Holocene thermal maximum in the pollen record. Sustained low net precipitation and increased evaporation during early Holocene warming suggest a moisture-limited spread of vegetation and ... : Supplement to: Fritz, Michael; Herzschuh, Ulrike; Wetterich, Sebastian; Lantuit, Hugues; De Pascale, Gregory P; Pollard, Wayne H; Schirrmeister, Lutz (2012): Late glacial and Holocene sedimentation, vegetation, and climate history from easternmost Beringia (northern Yukon Territory, Canada). Quaternary Research, 78(3), 549-560 ...