Climate logging with a new rapid optical technique at siple dome
Geophysical Research Letters
By: R.C. Bay, P.B. Price, G.D. Clow, and A. J. Gow
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Abstract
The dust logger design is based on a decade of experience in the use of light sources to measure optical properties of deep Antarctic ice. Light is emitted at the top of the instrument by side-directed LEDs, scattered or absorbed by dust in the ice surrounding the borehole, and collected in a downhole-pointing photomultiplier tube (PMT) a meter below. With this method the ice is sampled at ambient pressure in a much larger volume than is the case in a core study, and the entire length can be logged in one day. In ice in which scattering is dominated by bubbles, the absorption from dust impurities is perceived as a drop in signal, whereas in bubble-free ice the scattering from dust increases the light collected. We report on results obtained in Siple Dome Hole A in December 2000. The instrument measured increases in dust concentration extending over many meters during glacial maxima, as well as narrow spikes due to ??? 1 cm thick ash and dust bands of volcanic origin. Monte Carlo simulation is employed to clarify data analysis and predict the capabilities of future designs.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Climate logging with a new rapid optical technique at siple dome |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2001GL013763 |
| Volume | 28 |
| Issue | 24 |
| Year Published | 2001 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| First page | 4635 |
| Last page | 4638 |
| Google Analytic Metrics | Metrics page |