HR: 1050h
AN: P52A-03    [Abstracts]
TI: Europan Ocean Sulfate Chemistry To 700 MPa From -20 to 100 ^oC
AU: * Vance, S
EM: svance@ess.washington.edu
AF: University of Washington, Seattle and Jet Propulsion Laboratory, Earth and Space Sciences 070 Johnson Hall 351310, Seattle, WA 98195, United States
AU: Brown, J M
EM: brown@ess.washington.edu
AF: University of Washington, Seattle, Earth and Space Sciences 070 Johnson Hall 351310, Seattle, WA 98195, United States
AB: The scale height of Europa's ocean is comparable to that of Earth's atmosphere. Pressure at the bottom of Europa's ocean is as much as twice that at the greatest depth in Earth's. Subtle effects of pressure on aqueous solution chemistry at these depths may have profound implications for fluid dynamics and mass transport, which may be observable by the next Europa mission. In this context, we present an equation of state for aqueous MgSO₄, derived from speeds of sound obtained by the method of impulsive stimulated scattering. Measurements were made at 0, 0.5103, 0.9965, 1.506 and 2.014 m to 700 MPa from -20 to 100 ^oC. Few thermodynamic measurements have been made to such high pressures and low temperatures. This range is relevant to Europa's ocean and possibly other oceans in the outer Solar System. Preliminary analyses indicate densities measured above 100 MPa (equivalent to pressure at the bottom of the Marianas Trench in Earth's ocean) are misfit by extrapolation from previously published values by as much as ten percent.
UR: http://earthweb.ess.washington.edu/~svance/ISIS_AGU2007
DE: 1027 Composition of the planets
DE: 1060 Planetary geochemistry (5405, 5410, 5704, 5709, 6005, 6008)
DE: 1094 Instruments and techniques
DE: 5220 Hydrothermal systems and weathering on other planets
DE: 5460 Physical properties of materials
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting