Summer-temperature evolution on the Kamchatka Peninsula, Russian Far East, during the past 20,000 years
Vera D. Meyer1,2, Jens Hefter1, Gerrit Lohmann1, Ralf Tiedemann1, and Gesine Mollenhauer1,2,31Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, 27570, Germany 2Department of Geosciences University of Bremen, Bremen, 28359, Germany 3MARUM - Centre for Environmental Sciences, University of Bremen, Bremen, 28359, Germany
Received: 18 Feb 2016 – Accepted for review: 26 Mar 2016 – Discussion started: 06 Apr 2016
Abstract. Little is known about the climate evolution on the Kamchatka Peninsula during the last deglaciation as existing climate records do not reach beyond 12 ka BP. In this study, a summer-temperature record for the past 20 ka is presented. Branched Glycerol Dialkyl Glycerol Tetraethers, terrigenous biomarkers suitable for continental air temperature reconstructions, were analyzed in a sediment core from the western continental margin off Kamchatka/marginal Northwest Pacific (NW Pacific). The record reveals that summer temperatures on Kamchatka during the Last Glacial Maximum (LGM) equaled modern. We suggest that strong southerly winds associated with a pronounced North Pacific High pressure system over the subarctic NW Pacific accounted for the warm conditions. A comparison with outputs from an Earth System Model reveals discrepancies between model and proxy-based reconstructions for the LGM-temperature and atmospheric circulation in the NW Pacific realm. The deglacial temperature development is characterized by abrupt millennial-scale temperature oscillations. The Bølling/Allerød warm-phase and the Younger Dryas cold-spell are pronounced events, providing evidence for a strong impact of North-Atlantic climate variability on temperature development in southeastern Siberia. Summer insolation and teleconnections with the North Atlantic determine the long-term temperature development during the Holocene.
Meyer, V. D., Hefter, J., Lohmann, G., Tiedemann, R., and Mollenhauer, G.: Summer-temperature evolution on the Kamchatka Peninsula, Russian Far East, during the past 20,000 years, Clim. Past Discuss., doi:10.5194/cp-2016-21, in review, 2016.