HR: 1340h
AN: OS43A-0985    [Abstracts]
TI: Arctic Gakkel Ridge hydrothermal plume study by in-situ redox and particle size measurements.
AU: * Nakamura, K
EM: koichi.nakamura@aist.go.jp
AF: National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 7, 1-1-1 Higashi, Tsukuba, 305-8567, Japan
AU: Edmonds, H N
EM: edmonds@utmsi.utexas.edu
AF: University of Texas at Austin, Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States
AU: Winsor, P
EM: pwinsor@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Rd., Woods Hole, MA 02543, United States
AU: Liljebladh, B
EM: beli@oce.gu.se
AF: Goteborg University, Dept. Earth Sciences, box 460, Goteborg, 40530, Sweden
AU: Stranne, C
EM: stranne@gvc.gu.se
AF: Goteborg University, Dept. Earth Sciences, box 460, Goteborg, 40530, Sweden
AU: Upchurch, L
EM: upchurch@utmsi.utexas.edu
AF: University of Texas at Austin, Marine Science Institute, 750 Channel View Drive, Port Aransas, TX 78373, United States
AU: Singh, H
EM: hsingh@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Rd., Woods Hole, MA 02543, United States
AU: Jakuba, M
EM: jakuba@spray.me.jhu.edu
AF: Johns Hopkins University, Dynamical Systems and Control Lab, 3400 North Charles Street, Baltimore, MD 21218-2686, United States
AU: Willis, C
EM: ccwillis@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Rd., Woods Hole, MA 02543, United States
AU: Shank, T
EM: tshank@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Rd., Woods Hole, MA 02543, United States
AU: Humphris, S E
EM: shumphris@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Rd., Woods Hole, MA 02543, United States
AU: Reves-Sohn, R
EM: rsohn@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Rd., Woods Hole, MA 02543, United States
AB: Throughout the Arctic Gakkel Vents Expediton (AGAVE cruise), Eh electrodes (redox sensor) were mounted on all vehicles, i.e., CTD/rosette, PUMA and JAGUAR AUVs and mini-ROV CAMPER. The electrodes voltages were logged through either SBE 9+ auxiliary channel (CTD) or RS-232C ports (PUMA and CAMPER) or self-recorded by an independent logger (JAGUAR). The LISST (Laser In-Situ Scattering and Transimssiometry)-Deep particle size analyzer was attached on the CTD/rosette with an independent data logger and a battery pack. Redox sensor has been used widely over different tectonic and oceanographic settings to detect hydrothermal emission. Negative shifts of redox voltage in the course of vehicle track lines as well as CTD casts provide an indication of "close range" from the source. None of CTD cast in the peridotite site (~85 deg N, 7.5 deg E) showed any redox negative shift. There were various magnitude of redox negative shift in different height from the bottom recorded in CTD casts and AUV and CAMPER track lines in the volcano site near the eastern end of bared central high (~85.5 deg N, 85 deg E). Although the redox negative shifts varied from almost a mV to almost a hundred mV, the redox data collected during the cruise could not confirm the existence of high temperature vents in the volcano site.
DE: 3017 Hydrothermal systems (0450, 1034, 3616, 4832, 8135, 8424)
DE: 3035 Midocean ridge processes
DE: 3080 Submergence instruments: ROV, AUV, submersibles
DE: 4271 Physical and chemical properties of seawater
DE: 4851 Oxidation/reduction reactions (0471)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting