Analysis of a 290-Year Net Accumulation Time Series from Mt. Logan, Yukon

A 102.5-m mechanically continuous firn and ice core sequence retrieved from the Northwest Col of Mt. Logan (latitude 60°30'N; longitude 140°35'W; site location 5340 m a.s.l.) in the Yukon Territory, Canada, has been analyzed continuously for stable isotopes, pH and liquid electrolytic co...

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Bibliographic Details
Main Authors: Holdsworth, G., Krouse, H. R., Nosal, M., Spencer, M. J., Mayewski, Paul Andrew
Format: Text
Language:unknown
Published: DigitalCommons@UMaine 1989
Subjects:
Glaciogeology
Geochemistry
Glaciochemistry
Glaciology
Cryology
Climate Change
Hydrology
Yukon
Canada
ice core
Online Access:https://digitalcommons.library.umaine.edu/ers_facpub/270
https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1274/viewcontent/Analysis_of_a_290_year_net_accumulation_time_series_from_Mt._Logan__Yukon.pdf
Description
Summary:A 102.5-m mechanically continuous firn and ice core sequence retrieved from the Northwest Col of Mt. Logan (latitude 60°30'N; longitude 140°35'W; site location 5340 m a.s.l.) in the Yukon Territory, Canada, has been analyzed continuously for stable isotopes, pH and liquid electrolytic conductivity. Specific sections of the core have been analyzed for total β-activity (0-22 m) and trace ion concentrations (across major volcanic events) in order to date the core. In the lower half of the core, nitrate and some other ionic species are used to identify annual increments except between AD 1693 and AD 1720 and between AD 1729 and AD 1735 where only average annual increments are given. Annual increments were converted to water equivalents, then corrected for ice flow thinning as well as for origin, since a significant net accumulation gradient exists across the borehole site. The time series was subjected to cross correlation analysis, using instrumental data for the last 80 years, and to spectral analyses, using a 250-year sequence.

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