NDLI: In situ Raman probe for quantitative observation of sediment pore waters in the Deep Ocean

Content Provider	IEEE Xplore Digital Library
Author	Xin Zhang Kirkwood, W.J. Hester, K.C. Walz, P.M. Ussler, W. Peltzer, E.T. Shane, F. Brewer, P.G.
Copyright Year	2011
Description	Author affiliation: Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, USA (Kirkwood, W.J.; Walz, P.M.; Ussler, W.; Peltzer, E.T.; Shane, F.; Brewer, P.G.) \|\| Key Lab of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, PR China (Xin Zhang) \|\| ConocoPhillips, Bartlesville Technology Center, Bartlesville, OK 74004, USA (Hester, K.C.)
Abstract	Using the well developed Deep Ocean Raman In Situ Spectrometer (DORISS), we have developed an in situ deep-sea marine sediment pore water probe for geochemical studies. This novel device allows detailed measurement of pore water profiles. Our particular interest is in dissolved CH, $SO^{=},$ HS, and pH in situ without incurring artifacts due to the degassing that typically occurs with core recovery. A second generation DORISS instrument was developed at the Monterey Bay Aquarium Research Institute (MBARI) by engineering and science staff in 2005. The instrument is a plugin module for either of remotely operated vehicle (ROV) platforms at MBARI. DORISS has successfully performed in situ measurements on targets of scientific interest including high-temperature hydrothermal vent fluids, complex gas hydrates, and numerous other targets. Previously Raman techniques had been avoided to analyze sediment pore water geochemistry because of experience with the pore-waters strongly fluorescing. Simple experiments conducted with extracted pore-waters had previously demonstrated that fluorescence overwhelmed the relatively weak laser Raman signal. The in situ Raman pore water probe has worked around the fluorescence problem. The Raman pore water probe has been deployed a number of times at gas hydrate sites such as Hydrate Ridge, Barkley Canyon, and in the Santa Monica basin over the last two years. This paper will discuss the technique details and the exploration of expanding these same techniques into longer probes and looking at other difficult to obtain chemistries.
Starting Page	1
Ending Page	8
File Size	1379072
Page Count	8
File Format	PDF
ISBN	9781457700866
e-ISBN	9781457700880
DOI	10.1109/Oceans-Spain.2011.6003421
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-06
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Probes Sediments Sea measurements Fluorescence Raman scattering Optical filters Laboratories
Content Type	Text
Resource Type	Article

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