Dating firn cores by vertical strain measurements

Autor:	Nelia W. Dunbar, Robert L. Hawley, David L. Morse, Gregory A. Zielinski, E. D. Waddington
Rok vydání:	2002
Předmět:	010506 paleontology geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Firn Mineralogy Vertical Strain 01 natural sciences Dome (geology) Ice core Polar Ice sheet Geology 0105 earth and related environmental sciences Earth-Surface Processes
Zdroj:	Journal of Glaciology. 48:401-406
ISSN:	1727-5652 0022-1430
DOI:	10.3189/172756502781831250
Popis:	We have developed a system for measuring a vertical strain-rate profile in the firn on polar ice sheets using a readily available video camera to detect metal bands inserted in an air-filled hole. We used this system in 1995 and 1996 at Taylor Dome, Antarctica. We use density measurements combined with our strain rates to infer vertical velocities. From our velocities we calculate a steady-state depth–age scale for the firn at Taylor Dome. The age of a visible ash layer from 79.1 m is 675 ± 25 years; this ash can be correlated with ash found at 97.2 m in a recent ice core at Siple Dome, West Antarctica.
Databáze:	OpenAIRE
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