HR: 15:00h
AN: C13C-06    [Abstracts]
TI: Cirque Glacier Activity in Arctic Norway During the Last Deglaciation
AU: * Paasche, O
EM: Oyvind.paasche@bjerknes.uib.no
AF: Bjerknes Centre for Climate Research, Allegt.55, Bergen, 5007 Norway
AU: * Paasche, O
EM: Oyvind.paasche@bjerknes.uib.no
AF: Department of Earth Science, University of Bergen, Allegt. 55, Bergen, 5007 Norway
AU: Dahl, S O
EM: svein.dahl@geog.uib.no
AF: Bjerknes Centre for Climate Research, Allegt.55, Bergen, 5007 Norway
AU: Dahl, S O
EM: svein.dahl@geog.uib.no
AF: Department of Geography, University of Bergen, Breivikseidet. 45, Bergen, 5007 Norway
AU: Bakke, J
EM: jostein.bakke@bjerknes.uib.no
AF: Bjerknes Centre for Climate Research, Allegt.55, Bergen, 5007 Norway
AU: Bakke, J
EM: jostein.bakke@bjerknes.uib.no
AF: Department of Geography, University of Bergen, Breivikseidet. 45, Bergen, 5007 Norway
AU: Lovlie, R
EM: reidar.lovlie@geo.uib.no
AF: Department of Earth Science, University of Bergen, Allegt. 55, Bergen, 5007 Norway
AU: Nesje, A
EM: atle.nesje@geo.uib.no
AF: Bjerknes Centre for Climate Research, Allegt.55, Bergen, 5007 Norway
AU: Nesje, A
EM: atle.nesje@geo.uib.no
AF: Department of Earth Science, University of Bergen, Allegt. 55, Bergen, 5007 Norway
AB: Numerous cirques of the Lofoten-Vester†len archipelago in northern Norway have distinct moraine sequences that previously have been assigned to the Younger Dryas-Allerod (11 600 to 13 400 cal yrs BP) era, constraining the regional distribution of the equilibrium-line altitude (ELA) of both cirque glaciers and larger ice masses. In this study, we present evidence from a once glacier-fed lake on southern Andoya that contest this view. Detailed analyses of radiocarbon dated lacustrine sediments including rock magnetic parameters, grain size, organic matter, dry bulk density and visual interpretation suggest that there were no glacier in the low-lying cirque during Younger Dryas-Allerod. The initiation of the glacial retreat commenced with the onset of the Bolling warming (14 760 cal yrs BP) and was completed by the arrival of Allerod Interstade (13 400 cal yrs BP). The reconstructed glacier stages constrained by the attributes of the glaciolacustrine sediments and the moraine chronology of the investigated cirque suggest advances during a cool period from about 14 700 to 17 500 cal yrs BP coinciding with Heinrich event 1 (H1), and a somewhat larger advance between ca 19 100 and 21 050 cal yrs BP.
DE: 9315 Arctic region
DE: 3344 Paleoclimatology
DE: 1823 Frozen ground
DE: 1824 Geomorphology (1625)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting