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By Buford Price
Invention and operation of an optical dust logger: R. Bay, P. B. Price, G. D. Clow, A. J. Gow (2001). Climate logging with a new rapid optical technique at Siple Dome, GRL 28, 4635-4638.
Logger detected LGM, a 65 kyr dust peak corresponding to dust peaks seen at Vostok Station and Dome Fuji, ~30 volcanic ash bands, a signal due to a 103-yr hiatus in accumulation at ~675 m, and other features.
Collaboration with G. Zielinski and N. Dunbar on provenance and Ar-Ar age of deepest volcanic ash layer (950 m) at Siple Dome. No results yet.
Installed new electronics and horizontally beamed light sources in dust logger.
Dust logger detected the ~30 volcanic ash bands + another ~10.
Invented and operated a microbe logger; detected return signals in seven wavelength bands.
The two loggers detected a strong 103-yr hiatus in accumulation at a depth of 900 m; an abrupt change in accumulation at 722 m; possible weak changes at a number of depths including 432 and 802 m; and a strong signal at ~995 m probably associated with silt and bedrock.
Possible detection of annual layers in data at depths from ~90 m to ~600 m. Large variation in accumulation rates. Search for long-period modulation in progress.
To improve resolution of annual dust bands, use a horizontally directed laser.
Redesign path of returned light to eliminate background of scattered light.