GEOC 185 |
| Sheri N. White1, Edward T. Peltzer1, William J. Kirkwood1, Peter G. Brewer1, Jill D. Pasteris2, John J. Freeman2, and Brigitte Wopenka2. (1) Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, (2) Department of Earth and Planetary Sciences, Washington University, Campus Box 1169, St. Louis, MO 63132 |
| We report the successful development of a deep ocean raman in-situ spectrometer (DORISS) for geochemical studies in the deep ocean. A laboratory model Kaiser Optical Raman spectrometer was modified to fit into three custom designed pressure housings - the optical head, a laser-power supply-telemetry unit and the spectrometer - connected by deep-sea cables. The instrument ensemble has been field deployed on remotely operated vehicles (ROVs) for a variety of experiments and observations, with successful operation at 3600m and 1.6degC. The optical head is deployable by the ROV manipulator for sample interrogation; the remaining components are fixed within the vehicle tool-sled. In a series of over 20 dives in Monterey Bay and the Gulf of California, we have deployed DORISS to analyze solid, liquid and gas samples of synthetic and natural origin with spectral acquisition times of several tens of seconds. Video and exemplary spectra will be presented. |
|
Vibrational Spectroscopy in the Earth and Environmental Sciences
1:30 PM-4:50 PM, Thursday, April 1, 2004 Marriott -- Marquis NE, Oral
Division of Geochemistry |