Late Quaternary vegetation and lake system dynamics in north-eastern Siberia: Implications for seasonal climate variability

摘要: Although the climate development over Holocene in Northern Hemisphere is well known, palaeolimnological reconstructions reveal spatiotemporal variability northern Eurasia. Here we present a multi-proxy study from north-eastern Siberia combining sediment geochemistry, and diatom pollen data lake-sediment cores covering last 38,000 cal. years. Our results show major changes pyrite content fragilarioid species distributions, indicating prolonged seasonal lake-ice cover between ∼13,500 ∼8900 years BP possibly during 8200 cold event. A pollen-based reconstruction generated mean July temperature of 17.8 °C Thermal Maximum (HTM) ∼4500 BP. Naviculoid diatoms appear late shortening ice that continues today. strong correlation applied terrestrial aquatic indicators natural dynamics Holocene. Planktonic response to lake ecosystem due recent warming Anthropocene. We assess other studies infer pattern HTM affirm timing its onset, difference up 3000 north south, can be explained by climatic teleconnections. The westerlies brought air this part until Laurentide ice-sheet vanished 7000 ago. apparent delayed ending central Siberian record ascribed exceedance ecological thresholds trailing behind increases winter temperatures decreases contrast insolation seasons mid as lacking differentiation summer trends paleolimnological reconstructions.