HR: 0800h
AN: PP21A-1364    [Abstracts]
TI: Signal-to-Noise Ratios and Climate Records from the Eclipse Icefield Ice Cores
AU: Kreutz, K J
EM: karl.kreutz@maine.edu
AF: University of Maine, Climate Change Institue and Department of Earth Sciences, Orono, ME 04469
AU: * Wake, C P
EM: cameron.wake@unh.edu
AF: University of New Hampshire, Climate Change Research Center, Institute for the Study of Earth, Oceans, and Space, Morse Hall, Durham, NH 03824
AU: Yalcin, K
EM: kyalcin@cisunix.unh.edu
AF: University of New Hampshire, Climate Change Research Center, Institute for the Study of Earth, Oceans, and Space, Morse Hall, Durham, NH 03824
AB: The Arctic represents one of the key regions on Earth in our efforts to document and understand global change. The St. Elias mountain range in the southwestern Yukon Territory has recently been the focus of an international ice core research effort. Here we report on the signal-to-noise ratios and climate signals preserved in the major ion and stable isotope records from three cores recovered from the Eclipse Icefield (3107 m asl). The high snow accumulation rate (1.4 m water equivalent per year) allows for the development of seasonally to annual resolved records. Signal-to-noise ratios are calculated via statistical analysis of the glaciochemical records from the three different cores on seasonal and annual time frames. Our results indicate that stable isotopes and chemical species with gaseous precursors (e.g., sulfate, nitrate, and ammonium) show less glaciochemical variability at Eclipse compared to those species associated with particles. (e.g., calcium, magnesium, and sodium). We also provide a reconstruction of climatic variability in the region over the past 500 years via analysis of the stable isotope and major ion records.
DE: 1827 Glaciology (1863)
DE: 1620 Climate dynamics (3309)
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting