GEOSCAN Search Results: Fastlink


TitleStable 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
AuthorFisher, D A; Wake, C; Kreutz, K; Yalcin, K; Steig, E; Mayewski, P; Anderson, L; Zheng, JORCID logo; 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
SourceGlacial history, paleogeography and paleoenvironments in glaciated North America [part 1]; by Wolfe, S AORCID logo (ed.); Plouffe, AORCID logo (ed.); Géographie physique et Quaternaire vol. 58, no. 2-3, 2006 p. 337-352,
Alt SeriesEarth Sciences Sector, Contribution Series 2005103
PublisherConsortium Erudit
Mediapaper; on-line; digital
File formathtml; pdf
NTS114O; 115B; 115C; 115F; 115G
AreaPacific 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
Subjectshydrogeology; 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
Illustrationstables; sketch maps; time series; plots; models; cross-sections; profiles
ProgramReducing Canada's Vulnerability to Climate Change
Released2006 07 18
AbstractThree 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.

Date modified: