| Title | Stable isotope records from Mount Logan, Eclipse ice cores and nearby Jellybean Lake. Water cycle of the north Pacific over 2000 years and over five vertical kilometres: sudden shifts and tropical
connections |
| |
| 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; Burns, S J |
| Source | Glacial history, paleogeography and paleoenvironments in glaciated North America [part 1]; by Wolfe, S A (ed.); Plouffe, A (ed.); Géographie physique et Quaternaire vol. 58, no. 2-3, 2006 p. 337-352, https://doi.org/10.7202/013147ar |
| Image |  |
| Year | 2006 |
| Alt Series | Earth Sciences Sector, Contribution Series 2005103 |
| Publisher | Consortium Erudit |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | html; pdf |
| Province | Yukon |
| NTS | 114O; 115B; 115C; 115F; 115G |
| Area | Pacific northwest; Mount Logan; Prospectors Peak; Kluane Lake; Jellybean Lake; Prospector-Russell Col; King Col; Kaskawalsh Glacier; Hubbard Glacier; Seward Glacier; Mount St. Elias; Alaska; Yakutat;
Malaspina Glacier; Canada; United States of America |
| Lat/Long WENS | -142.0000 -138.0000 62.0000 59.0000 |
| Subjects | hydrogeology; geochemistry; surficial geology/geomorphology; Nature and Environment; Recent; climate, arctic; core studies; ice samples; stable isotope studies; oxygen isotopes; climatology;
paleoclimatology; atmospheric geochemistry; hydrologic environment; models; computer simulations; glaciers; lake sediment cores; source areas; Little Ice Age; European Medieval Warm Period; Rossby Wave system; Aleutian Low; Walker cicrulation; Hadley
circulation; El Niño; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | tables; sketch maps; time series; plots; models; cross-sections; profiles |
| Program | Reducing Canada's Vulnerability to Climate Change
|
| Released | 2006 07 18 |
| Abstract | Three ice cores recovered on or near Mount Logan, together with a nearby lake record (Jellybean Lake), 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. Comparison of stable isotope series over the last 2000 years
and model simulations suggest sudden and persistent shifts between modern (mixed) and zonal flow regimes of water vapour transport to the Pacific Northwest. The last such shift was in A.D.\~1840. Model simulations for modern and -pure- zonal flow
suggest that these shifts are consistent regime changes between these flow types, with predominantly zonal flow prior to ca. A.D.\~1840 and modern thereafter. The 5.4 and 0.8\~km\~asl records show a shift at A.D.\~1840 and another at A.D.\~800. It is
speculated that the A.D.\~1840 regime shift coincided with the end of the Little Ice Age and the A.D.\~800 shift with the beginning of the European Medieval Warm Period. The shifts are very abrupt, taking only a few years at most. |
| GEOSCAN ID | 220680 |
|
|