Europan Ocean Sulfate Chemistry To 700 MPa From -20 to 100 °C

Details Europan Ocean Sulfate Chemistry To 700 MPa From -20 to 100 °C Europan Ocean Sulfate Chemistry To 700 MPa From -20 to 100 °C

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p52a..03v&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P52A-03

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1027 Composition Of The Planets, 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 1094 Instruments And Techniques, 5220 Hydrothermal Systems And Weathering On Other Planets, 5460 Physical Properties Of Materials

Scientific paper

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 °C. 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.

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