The effects of flowline length evolution on chemistry–δ18O profiles from Penny Ice Cap, Baffin Island, Canada
| Autor: | Nancy Grummet, Christian Zdanowicz, Paul Andrew Mayewski, Gregory A. Zielinski, Cameron P. Wake, Jocelyne Bourgeois, David A. Fisher, Roy M. Koerner |
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| Rok vydání: | 2002 |
| Předmět: |
Drift ice
Canada 010506 paleontology geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ice stream Annan geovetenskap och miljövetenskap Antarctic sea ice 01 natural sciences Arctic ice pack Ice shelf Arctic Oceanography Ice core Ice cores Laurentide Ice Sheet Penny Ice Cap Sea ice Ice sheet aerosols Geology Other Earth and Related Environmental Sciences 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1727-5644 0260-3055 |
| DOI: | 10.3189/172756402781817257 |
| Popis: | The isotopic and chemical signatures for ice-age and Holocene ice from Summit, Greenland, and Penny Ice Cap, Baffin Island, Canada, are compared. the usual pattern of low δ18O, high Ca2+ and high Cl– is presented in the Summit records, but Penny Ice Cap has lower than present Cl– in its ice-age ice. A simple extension of the Hansson model (Hansson, 1994) is developed and used to simulate these signatures. the low ice-age Cl– from Penny Ice Cap is explained by having the ice-age ice originating many thousands of km inland near the centre of the Laurentide ice sheet and much further from the marine sources. Summit’s flowlines all start close to the present site. the Penny Ice Cap early-Holocene δ18O’s had to be corrected to offset the Laurentide meltwater distortion. the analysis suggests that presently the Summit and Penny Ice Cap marine impurity originates about 500 km away, and that presently Penny Ice Cap receives a significant amount of local continental impurity. |
| Databáze: | OpenAIRE |
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