GGrantIndex
← Search

MOTIVATED BY OUR SUCCESSFUL LABORATORY STUDIES OF AQUEOUS MAGNESIUM SULFATE AND OF AMMONIA WATER SOLUTIONS WE DEVELOPED POWERFUL AND EFFICIENT ANALYSIS TOOLS BASED ON GEOPHYSICAL INVERSE TECHNIQUES TO EXTRACT EQUATION OF STATE PROPERTIES FROM SOUND VELOCITY MEASUREMENTS. RESULTS FROM THESE STUDIES HAVE BEEN USED TO CONSTRUCT MELTING CURVES FOR ICES IN THE PRESENCE OF MGSO4 TO ASSESS AFFECTS OF OCEAN SALINITY ON THE THICKNESSES OF NORMAL- AND HIGH-PRESSURE ICE LAYERS IN THE LARGE ICY SATELLITES: GANYMEDE CALLISTO AND TITAN. FURTHERMORE THIS WORK PROVIDES THE FUNDAMENTAL DATA THAT ARE ESSENTIAL IN VALIDATING AND IMPROVING THE GEOCHEMICAL MODELS UTILIZED IN PLANETARY STUDIES.FOR THE NEXT PHASE OF THIS STUDY WE INTEND TO EXTEND OUR LABORATORY MEASUREMENTS TO MULTICOMPONENT AQUEOUS SOLUTIONS RELEVANT TO SUBSURFACE LIQUID RESERVOIRS ON ICY SATELLITES AND PLANETS. THE NEWLY DEVELOP ANALYSIS TOOLS WILL PROVIDE A ROBUST FRAMEWORK TO INTERPRET INCREASINGLY COMPLEX DATA SETS. TWO SPECIFIC NASA-RELATED TARGETS HAVE BEEN CHOSEN TO ADDRESS THE PROPERTIES OF LIQUIDS IN ICY SATELLITES OF OUTER PLANETS PARTICULARLY IN ENCELADUS AND EUROPA: 1. EQUATIONS OF STATE FOR SODIUM CHLORIDE SOLUTIONS: LOW BULK WATER-ROCK RATIO FORMATION SCENARIOS FOR ICY WORLD OCEANS SUPPORT THE DOMINANCE OF NACL COMPOSITIONS. RECENT OBSERVATION OF SODIUM IN WATERY PLUME PARTICLES FROM ENCELADUS SUGGESTS WATER-ROCK INTERACTIONS IN THAT MOON'S INTERIOR HAVE FAVORED THE EXTRACTION OF NACL. OUR WORK TO DATE HAS REVEALED THAT FUNDAMENTAL DATA FOR THIS SYSTEM ARE NEEDED AT SUBZERO TEMPERATURES; THIS ASPECT IS PARTICULARLY CRITICAL FOR ASSESSING ICE SHELL THICKNESSES AND OCEAN DYNAMICS OWING TO THE STEEP FREEZING POINT SUPPRESSION EFFECT OF AQUEOUS CHLORIDE. 2. EQUATIONS OF STATE FOR AQUEOUS MIXTURES IN THE MGSO4-NACL-NA2SO4-MGCL2-NH3 SYSTEM ARE TARGETED FOR ADDRESSING THE EFFICACY OF EXISTING ANALYTICAL FRAMEWORKS FOR ACCURATELY REPRESENTING ION-SOLVENT AND ION-ION INTERACTIONS UNDER NON-STANDARD CONDITIONS OF PRESSURE AND TEMPERATURE. WE WILL MEASURE SOUND VELOCITIES IN SOLUTIONS WITHIN THE HIGH PRESSURE AND LOW TEMPERATURE REGIMES RELEVANT TO THESE BODIES. FROM THESE DATA WE DETERMINE EQUATIONS OF STATE (DENSITIES THERMAL EXPANSIVITIES SPECIFIC HEATS) AND MIXING PARAMETER (PARTIAL MOLAL VOLUMES AND PITZER COEFFICIENTS . THIS NEW KNOWLEDGE OF THE EQUILIBRIUM THERMOCHEMISTRY AND THE AVAILABILITY OF NEW COMPUTATIONAL TOOLS WILL ENABLE RESEARCH LEADING TO BETTER CONSTRAINTS ON SUBSURFACE CHEMISTRY AND FLUID DYNAMIC PROCESSES CONTROLLING HEAT FLUXES AND PLANETARY EVOLUTION.

$308,717FY2014National Aeronautics and Space AdministrationNASA

University Of Washington, Seattle WA

Investigators

View source on USAspending →
MOTIVATED BY OUR SUCCESSFUL LABORATORY STUDIES OF AQUEOUS MAGNESIUM SULFATE AND OF AMMONIA WATER SOLUTIONS WE DEVELOPED POWERFUL AND EFFICIENT ANALYSIS TOOLS BASED ON GEOPHYSICAL INVERSE TECHNIQUES TO EXTRACT EQUATION OF STATE PROPERTIES FROM SOUND VELOCITY MEASUREMENTS. RESULTS FROM THESE STUDIES HAVE BEEN USED TO CONSTRUCT MELTING CURVES FOR ICES IN THE PRESENCE OF MGSO4 TO ASSESS AFFECTS OF OCEAN SALINITY ON THE THICKNESSES OF NORMAL- AND HIGH-PRESSURE ICE LAYERS IN THE LARGE ICY SATELLITES: GANYMEDE CALLISTO AND TITAN. FURTHERMORE THIS WORK PROVIDES THE FUNDAMENTAL DATA THAT ARE ESSENTIAL IN VALIDATING AND IMPROVING THE GEOCHEMICAL MODELS UTILIZED IN PLANETARY STUDIES.FOR THE NEXT PHASE OF THIS STUDY WE INTEND TO EXTEND OUR LABORATORY MEASUREMENTS TO MULTICOMPONENT AQUEOUS SOLUTIONS RELEVANT TO SUBSURFACE LIQUID RESERVOIRS ON ICY SATELLITES AND PLANETS. THE NEWLY DEVELOP ANALYSIS TOOLS WILL PROVIDE A ROBUST FRAMEWORK TO INTERPRET INCREASINGLY COMPLEX DATA SETS. TWO SPECIFIC NASA-RELATED TARGETS HAVE BEEN CHOSEN TO ADDRESS THE PROPERTIES OF LIQUIDS IN ICY SATELLITES OF OUTER PLANETS PARTICULARLY IN ENCELADUS AND EUROPA: 1. EQUATIONS OF STATE FOR SODIUM CHLORIDE SOLUTIONS: LOW BULK WATER-ROCK RATIO FORMATION SCENARIOS FOR ICY WORLD OCEANS SUPPORT THE DOMINANCE OF NACL COMPOSITIONS. RECENT OBSERVATION OF SODIUM IN WATERY PLUME PARTICLES FROM ENCELADUS SUGGESTS WATER-ROCK INTERACTIONS IN THAT MOON'S INTERIOR HAVE FAVORED THE EXTRACTION OF NACL. OUR WORK TO DATE HAS REVEALED THAT FUNDAMENTAL DATA FOR THIS SYSTEM ARE NEEDED AT SUBZERO TEMPERATURES; THIS ASPECT IS PARTICULARLY CRITICAL FOR ASSESSING ICE SHELL THICKNESSES AND OCEAN DYNAMICS OWING TO THE STEEP FREEZING POINT SUPPRESSION EFFECT OF AQUEOUS CHLORIDE. 2. EQUATIONS OF STATE FOR AQUEOUS MIXTURES IN THE MGSO4-NACL-NA2SO4-MGCL2-NH3 SYSTEM ARE TARGETED FOR ADDRESSING THE EFFICACY OF EXISTING ANALYTICAL FRAMEWORKS FOR ACCURATELY REPRESENTING ION-SOLVENT AND ION-ION INTERACTIONS UNDER NON-STANDARD CONDITIONS OF PRESSURE AND TEMPERATURE. WE WILL MEASURE SOUND VELOCITIES IN SOLUTIONS WITHIN THE HIGH PRESSURE AND LOW TEMPERATURE REGIMES RELEVANT TO THESE BODIES. FROM THESE DATA WE DETERMINE EQUATIONS OF STATE (DENSITIES THERMAL EXPANSIVITIES SPECIFIC HEATS) AND MIXING PARAMETER (PARTIAL MOLAL VOLUMES AND PITZER COEFFICIENTS . THIS NEW KNOWLEDGE OF THE EQUILIBRIUM THERMOCHEMISTRY AND THE AVAILABILITY OF NEW COMPUTATIONAL TOOLS WILL ENABLE RESEARCH LEADING TO BETTER CONSTRAINTS ON SUBSURFACE CHEMISTRY AND FLUID DYNAMIC PROCESSES CONTROLLING HEAT FLUXES AND PLANETARY EVOLUTION. · GrantIndex