Diatom oxygen isotope records of Northern Eurasia as indicators of environmental, hydrological and climate changes in the regions
Authors: Kostrova  ,   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, Potsdam, 14473, Germany, Bailey  ,   Department of Ecology and Genetics, University of Oulu, Oulu, 90014, Finland, Biskaborn  ,   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, Potsdam, 14473, Germany, Chapligin  ,   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, Potsdam, 14473, Germany, Dvornikov  ,   Department of Landscape Design and Sustainable Ecosystems, Agrarian-Technological Institute, eoples Friendship University of Russia (RUDN University), Miklukho-Maklaya Str., 6, Moscow, 117198, Russia, Ekaykin  ,   Arctic and Antarctic Research Institute, Bering Str., 38, St. Petersburg, 199397, Russia, Fernandoy  ,   Laboratorio de anlisis isotpico, Facultad de Ingeniera, Universidad Andrs Bello, Quillota Str., 980, Via del Mar, 2531015, Chile, Kozachek  ,   Arctic and Antarctic Research Institute, Bering Str., 38, St. Petersburg, 199397, Russia, Kuhn  ,   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, 27568, Germany, Ludikova  ,   Institute of Limnology, Russian Academy of Sciences, Sevastyanova Str., 9, St. Petersburg, 196105, Russia, Meister  ,   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, Potsdam, 14473, Germany, Nazarova  ,   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, Potsdam, 14473, Germany, Pestryakova  ,   North-Eastern Federal University of Yakutsk, Institute of Natural Sciences, Belinskogo Str., 58, Yakutsk, 677000, Russia, Shibaev  ,   Arctic and Antarctic Research Institute, Bering Str., 38, St. Petersburg, 199397, Russia, Syrykh  ,   Herzen State Pedagogical University of Russia, Moika, 48, St. Petersburg, 191186, Russia, Meyer  ,   Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Research Unit Potsdam, Telegrafenberg A45, Potsdam, 14473, Germany
Published: September 2022

Abstract. The environmental, hydrological and climate dynamics were assessed in Northern Eurasia during the Holocene. The reconstructions are based on oxygen isotope composition of lacustrine diatom silica ( 18Odiatom) preserved in sediment cores from Ladoga, Bolshoye Shchuchye and Emanda lakes. Interpretation of the 18Odiatom data is supported by a comprehensive study of modern isotope hydrology and analysis of local and regional proxies. The Northern Eurasia 18Odiatom records are characterized by pronounced short term variations (1.5 5 ), pointing to the unstable climatic and hydrological conditions in the study regions. All records have clearly demonstrated a gradual depletion over the Holocene in their 18Odiatom values by ~3 4 , which follows the trend of decreasing summer insolation, as well as the temperature history of the Northern Hemisphere (NH), indicating a positive response of diatom oxygen isotope signal to large-scale climate changes.