CGRG Bibliography of Canadian Geomorphology
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Author : Fisher, D.A.; Wake, C.; Kreutz, K.; Yalcin, K.; Steig, E.; Mayewski, P.; Anderson, L.; Zheng, J.; Rupper, S.; Zdanowicz, C.; Demuth, M.; Waszkiewicz, M.; Dahl-Jensen, D.; Goto-Azuma, K.; Bourgeois, J.B.; Koerner, R.M.; Sekerka, J.; Osterberg, E.; Abbott, M.B.; Finney, B.P.; and Burns, S.J.
Date : 2006.
Title : Stable isotope records from Mount Logan and Eclipse ice cores and nearby Jellybean Lake; water cycle of the North Pacific over 20,000 years and over 5 vertical kilometres; sudden shifts all through the Holocene.q
Publication : North Pacific Climate Workshop. Canadian Institute of Ocean Sciences, Sidney, British Columbia, Canada. March 1 to 3, 2006.
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Abstract
Three ice cores recovered on or near Mt. Logan (3.0, 4.3 and 5.4 km asl), together with a nearby lake record (Jellybean Lake; 0.8 km asl), cover variously 500 to 30 000 years. This suite of records offers a unique view of the lapse rate in stable isotopes from the lower to upper troposphere. The region is climatologically important, being beside the Cordilleran pinning point of the Rossby Wave system and the Aleutian Low. The impurity concentrations for the highest site “PRC” core are now available and will be described by Osterberg. By comparison to the very well dated Eclipse core the PRC time scale is now well established over the upper 550 years and better established over the Holocene. The 5.4 kasl O18 record shows a shift at AD 1820 and another at AD 800. The early tentative time scale had put the recent shift at 1840 AD. Now the recent core dating is pinned to a very solid Katmai peak in SO4 and Cl and a comparison to the Eclipse core. The large O18 shifts in the PRC core are not seen in the Eclipse core. If anything there is a slight tendency for an anti-correlation between PRC and Eclipse stable isotopes. The Holocene relationship between stable isotopes and chemical impurities is discussed and compared to other paleo-records. Large O18 shifts occur all through the Holocene, in conjunction with peaks in Ca (continental dust) the largest occurring at 4200 BP. This O18 dust relationship is typical of what is seen in the Ice Age, but this is the first time it has been clearly seen in the Holocene part of an ice core record.
Bibliography of Canadian Geomorphology