HR: 14:15h
AN: C13C-03    [Abstracts]
TI: Late Quaternary Environment Of Central Yakutia, East Siberia
AU: * Diekmann, B
EM: bdiekmann@awi-potsdam.de
AF: Alfred Wegener Institute for Polar and Marine Research, P.O.Box 600149, Potsdam, 14473 Germany
AU: Lehmkuhl, F
EM: flehmkuhl@geo.rwth-aachen.de
AF: Aachen University, Department of Geography, Templergraben 55, Aachen, 52056 Germany
AU: Andreev, A
EM: aandreev@awi-potsdam.de
AF: Alfred Wegener Institute for Polar and Marine Research, P.O.Box 600149, Potsdam, 14473 Germany
AU: Frechen, M
EM: M.Frechen@gga-hannover.de
AF: Leibniz Institute for Applied Geosciences (GGA), Stilleweg 2, Hannover, 30655 Germany
AU: Hubberten, H
EM: hubbert@awi-potsdam.de
AF: Alfred Wegener Institute for Polar and Marine Research, P.O.Box 600149, Potsdam, 14473 Germany
AU: Pestryakova, L
EM: lapest@mail.ru
AF: University Yakutsk, Water Ecosystem Laboratory, Belinsky St.58, Yakutsk, 677891 Russian Federation
AU: Popp, S
EM: spopp@awi-potsdam.de
AF: Alfred Wegener Institute for Polar and Marine Research, P.O.Box 600149, Potsdam, 14473 Germany
AU: Siegert, C
EM: csiegert@awi-potsdam.de
AF: Alfred Wegener Institute for Polar and Marine Research, P.O.Box 600149, Potsdam, 14473 Germany
AU: Spektor, V
EM: valentin-spektor@mail.ru
AF: Melnikov Permafrost Institute, Merzlotnaya 10, Yakutsk, 677010 Russian Federation
AU: Stauch, G
EM: gstauch@geo.rwth-aachen.de
AF: Aachen University, Department of Geography, Templergraben 55, Aachen, 52056 Germany
AB: A Russian-German joint project, investigating the late Quaternary development of periglacial and glacial landscapes, lacustrine systems, as well as permafrost complexes and ground ice features in central Yakutia, is currently in progress. Field work was carried out in 2002 and 2003 along the Tumara and Djanushka rivers in the Verkhoyansk Mountains and its foreland, and in 2004 in the alass region northeast of Yakutsk. Geomorphological and sedimentological findings, satellite-image evaluation, and first dating results by optical-stimulated luminescence give evidence of multiple glacial advances in the foreland of the Verkhoyansk Mountains that were not in phase with variations in global ice volume. The last episode with extended piedmont glaciers entering the Verkhoyansk foreland took place around 32 ka BP. No major glacier advances are evident for the global last glacial maximum, because dry conditions apparently prevented sufficient snow and ice accumulation, as suggested by the deposition of extended loess-like sediments at that time. Stable-isotope records of ice wedges, as indicators of palaeo winter temperatures, together with pollen records from Lake Satagay give evidence of an early Holocene climate optimum between approximately 8.0 and 6.0 ka BP, followed by climate deterioration during the late Holocene. Variations in the concentration and composition of organic matter in the Lake Satagay sediment record, moreover, reveal pronounced fluctuations of lake-level status, attributed to short-term climate oscillations at centennial time scales that caused cyclic changes in aridity.
DE: 9315 Arctic region
DE: 9604 Cenozoic
DE: 1823 Frozen ground
DE: 1620 Climate dynamics (3309)
DE: 1625 Geomorphology and weathering (1824, 1886)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting