| 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. |
| Genre: | Article |
| ProdID: | 70022746 |
| Citation Author: | Bay, R. C.; Price, P. B.; Clow, G. D.; Gow, A. J. |
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| Citation End Page: | 4638 |
| Citation Issue: | 24 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Research Letters |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Climate logging with a new rapid optical technique at siple dome; 2001; Article; Journal; Geophysical Research Letters; Bay, R. C.; Price, P. B.; Clow, G. D.; Gow, A. J. |
| Citation Start Page: | 4635 |
| Citation Volume: | 28 |
| Citation Year: | 2001 |
| Type: | citation/reference |
| Text: | Climate logging with a new rapid optical technique at siple dome; 2001; Article; Journal; Geophysical Research Letters; Bay, R. C.; Price, P. B.; Clow, G. D.; Gow, A. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1029/2001GL013763 |
| Date Other: | Mon, 1 Jan 2001 00:00 -0600 |
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