DORISS - Deep ocean Raman in situ spectrometer II
Project Manager: Ed Peltzer
Lead Scientist: Peter Brewer
Lead Engineer: Bill Kirkwood
MBARI engineers and scientists have succeeded in developing and deploying the world's first deep-ocean Raman system. This breakthrough does not represent a single instrument, but the establishment of a fundamental observing mode that has wide applications, and many routes for sophisticated development.
Project goals proposed for 2005 are:
- Complete and publish analysis of data recovered.
- Continue engineering development. The current prototype system is the end result of compromises made and lessons learned. New components (a high sensitivity probe head, new laser, and others) will be installed and tested. The priority is to provide weight/size reduction along with greater sensitivity, creating a system for use in the larger oceanographic community.
- Laboratory development program. Early evidence of spectroscopic detection of the oceanic CO2 system components indicate an extraordinary breakthrough for ocean geochemistry. If we modify the system to higher power and/or extend path length, novel work can be done in the laboratory.
- Instrumentation development for pore waters. Sulfate gradients in pore water are a powerful diagnostic of the depth of the methane boundary below, and the sulfate ion is a readily Raman detectable signal in sea water. With engineering help, we propose to develop pore water sensing capability by adding a small piston and filter arrangement to the insertion probe.
- Design concept for an AUV supported Raman. The Office of Naval Research (ONR) has asked whether an AUV Raman system could be devised for non-invasive sensing of objects on the ocean floor. This is possible in concept but would require very extensive development work. MBARI will have further discussions with ONR and will pursue deeper research into possible development of this concept.