Statistics – Computation
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p72b0508v&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P72B-0508
Statistics
Computation
3919 Equations Of State, 6062 Satellites, 6218 Jovian Satellites
Scientific paper
Equation of state data at high pressure need to be incorporated into computational efforts to understand the evolution of the composition of Europa's ocean. These efforts also have applications to other planetary bodies and for Earth's deep oceans. While investigators refer to some experimental constraints in consideration of the likely effects of high pressures on the relevant aqueous geochemistry, calculations have not yet taken them into account. Specific processes requiring a better understanding of the role of high pressures include devolatilization within the rocky interior, the evolution of volatiles released into the ocean, metamorphism of hydrated salts on the seafloor, and temperature oscillations of the system in response to changes in tidal heating. We derive chemical potentials for aqueous solutions from speeds of sound measured as functions of pressure and temperature. These parameters are determined in our laboratory through the method of impulsive stimulated scattering. A complete equation of state for aqueous sodium sulfate up to 34 kbar and 573 K is reported in terms of activity coefficients and volumes of mixing. Systematic trends within this important chemical system provide guidance in constructing the overall framework of aqueous geochemistry in multicomponent systems at elevated pressures.
Brown Jacqueline
Kargel Jeff S.
Vance Stephanie
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