The effects of flowline length evolution on chemistry - δ18O profiles from Penny Ice Cap, Baffin Island, Canada

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 δ180, 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....

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Bibliographic Details
Published in:Annals of Glaciology
Main Authors: Fisher, D. A., Koerner, R. M., Zielinski, G. A., Wake, C. P., Zdanowicz, Christian, Bourgeois, J. C., Mayewski, P. A., Grummet, N.
Format: Article in Journal/Newspaper
Language:English
Published: Geological Survey of Canada 2002
Subjects:
Ice cores
aerosols
Arctic
Canada
Laurentide Ice Sheet
Penny Ice Cap
Other Earth and Related Environmental Sciences
Annan geovetenskap och miljövetenskap
Baffin Island
Greenland
Annals of Glaciology
Baffin
Ice cap
Ice Sheet
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-300886
https://doi.org/10.3189/172756402781817257
Description
Summary: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 δ180, 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 δ180's had to be corrected to offset the Laurentide meltwater distortion.The analysis suggests that presently the Summit and Penny Ice Cap marine impurity ori­ ginates about 500 km away, and that presently Penny Ice Cap receives a significant amountoflocal continental impurity.

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