HR: 11:05h
AN: OS42A-04    [Abstracts]
TI: Physical properties and constraints of hydrothermal plumes on the Gakkel Ridge during AGAVE 2007
AU: * Winsor, P
EM: pwinsor@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, MA 02536, United States
AU: Liljebladh, B
EM: beli@oce.gu.se
AF: Goteborg University Department of Earth Sciences, Guldhedsgatan 5c, Goteborg, 40530, Sweden
AU: Edmonds, H N
EM: edmonds@utmsi.utexas.edu
AF: University of Texas Austin Marine Science Institute, 750 Channel View Drive, Port Arkansas, TX 78373, United States
AU: Stranne, C
EM: chst@oce.gu.se
AF: Goteborg University Department of Earth Sciences, Guldhedsgatan 5c, Goteborg, 40530, Sweden
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: Reves-Sohn, R A
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, MA 02536, United States
AU: Tupper, G
EM: gtupper@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, MA 02536, United States
AU: Upchurch, L
EM: upchurch@utmsi.utexas.edu
AF: University of Texas Austin Marine Science Institute, 750 Channel View Drive, Port Arkansas, TX 78373, United States
AB: The unique hydrographic characteristics of the Arctic Ocean have important implications for the dynamical behavior of hydrothermal plumes. Some of the main issues include the weak density stratification of the deep bottom layer, topographical effects from a deep axial valley, and high-latitude tides. We address these issues using analytical and numerical models, and comparing the results to hydrographic water column plume data acquired during the Arctic Gakkel Vents Expedition (AGAVE) from July 1 to August 10, 2007. A total of 36 CTD casts were conducted from the icebreaker Oden at two main sites (85N 7E and 85N 85E), where different modes of hydrothermal circulation appear to generate different kinds of water column plumes. Several plume signals of varying thickness and rise height above the bottom were observed, which implies that several seafloor sources with distinct discharge characteristics were active during the surveys. We use our models to constrain the character of the seafloor sources, and discuss observational strategies for future field work aimed at locating and mapping hydrothermal sources in the deep Arctic.
DE: 0317 Chemical kinetic and photochemical properties
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