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Ocean Worlds Program Ocean Worlds May 21–22, 2019 • Columbia, Maryland Institutional Support Lunar and Planetary Institute Universities Space Research Association Co-Conveners Louise Prockter USRA/Lunar and Planetary Institute Jonathan Kay USRA/Lunar and Planetary Institute Science Organizing Committee Steve Vance NASA Jet Propulsion Laboratory Amy E. Hofmann NASA Jet Propulsion Laboratory Chris German Woods Hole Oceanographic Institution Catherine Walker NASA Goddard Space Flight Center Jacob Buffo Georgia Institute of Technology Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 Abstracts for this meeting are available via the meeting website at www.hou.usra.edu/meetings/oceanworlds2019/ Abstracts can be cited as Author A. B. and Author C. D. (2019) Title of abstract. In Ocean Worlds, Abstract #XXXX. LPI Contribution No. 2168, Lunar and Planetary Institute, Houston. Guide to Sessions Ocean Worlds 4 May 21–22, 2019 Columbia, Maryland Tuesday, May 21, 2019 9:00 a.m. USRA Conference Center Modeling of Ice Shells I 1:00 p.m. USRA Conference Center Modeling of Ice Shells II 5:00 p.m. USRA Education Gallery Poster Session Wednesday, May 22, 2019 9:00 a.m. USRA Conference Center Water in Ice: Modeling, Field, and Lab Work 1:00 p.m. USRA Conference Center Water in Ice: Mission Proposals and Field Work Program Tuesday, May 21, 2019 MODELING OF ICE SHELLS I 9:00 a.m. USRA Conference Center Chair: Jonathan Kay Times Authors (*Denotes Presenter) Abstract Title and Summary 9:00 a.m. Opening Remarks and Welcome 9:20 a.m. Craft K. L. * Walker C. C. Icy Ocean Worlds / Stress, Heat, and Quick L. C. Lowell R. P. Roberts J. Fracture? / ....Just Let it Flow! [#6022] Stress, heat, and fluid flow can induce fracturing and cause surface modification. We present modeling work on these topics for icy ocean worlds. 10:00 a.m. Montesi L. G. J. * Howell S. M. Ice Thickness on Europa: Effects of Convection Pappalardo R. T. and Rifting [#6007] The ice shell of Europa should be ~20 km thicker at the poles, and convection limited to less than ~60° latitude. Band should stand at lower elevation than regional plains if active and rise when activity stops. 10:20 a.m. Roberts J. H. * Kay J. P. Evolution of Ice Shells on Ocean Worlds [#6017] Freezing and melting / Ocean worlds not steady state / Grids must be redrawn. 10:40 a.m. Howell S. M. * Pappalardo R. T. The Fate of Icy Slabs on Europa: Implications for Detecting Active Convergent Margins in Ocean World Ice Shells [#6036] We use two-dimensional models of an icy slab intruding into Europa’s ice shell interior to predict temperature, density, porosity, and composition over time. As a slab subsumes, we predict the isostatic topography and timescales of reincorporation. 11:00 a.m. Discussion 12:00 p.m. Lunch Tuesday, May 21, 2019 MODELING OF ICE SHELLS II 1:00 p.m. USRA Conference Center Chair: Kathleen Craft Times Authors (*Denotes Presenter) Abstract Title and Summary 1:00 p.m. Rhoden A. R. * Walker M. E. The Complex Viscosity Structure of Icy Shells in Non-Synchronously Rotating Moons and Implications for Transport Processes [#6020] Spinning icy shells / Cause shallow tidal heating / Warming from within. 1:20 p.m. Lobo A. H. * Thompson A. F. The Influence of Ice on Overturning Circulation in Vance S. D. Ocean Worlds [#6040] Ice-ocean interactions, which are likely to have a significant impact on overturning circulations of ocean worlds and provide insight into their evolutions, are explored here with a combination of conceptual and idealized ocean models. 1:40 p.m. Tyler R. H. * The Long-Term Maintenance of Liquid-Water Oceans by Self-Tuned Ocean Tidal Resonance [#6016] This presentation describes the process of self- tuned resonance in the tidal response of an ice+ocean coupled system. It also describes the availability of the TROPF (Tidal Response of Planetary Fluids) software package. 2:00 p.m. Hesse M. A. * Jordan J. S. Brine Drainage from Chaotic Terrains as a Source Vance S. D. McCarthy C. of Oxidants for Europa’s Interior Ocean [#6019] We investigate the downward transport of surface oxidants by the percolation of dense brines formed during the formation of chaotic terrains. 2:20 p.m. Discussion 3:00 p.m. Break 3:20 p.m. Hay H. C. F. C. * Matsuyama I. Ocean-Ice Shell Coupling and Nonlinear Tidal Dissipation in Ocean Worlds [#6037] Our numerical ocean tide model is coupled to the elastic response of an overlying ice shell. We investigate how ice shells of varying thickness impact the dynamical response of the ocean to tidal forcing and how they affect oceanic tidal heating. 3:40 p.m. Hammond N. P. * Near-Surface Melt on Europa: Modeling the Formation and Migration of Brines in a Dynamic Ice Shell [#6024] I examine how the presence of salts affect the dynamics of melt generation and migration in Europa’s ice shell. I find that low-temperature brines can readily be generated in the near-surface by shear heating beneath strike-slip faults. 4:00 p.m. Buffo J. J. * Schmidt B. E. Quantifying Impurity Entrainment at Huber C. Walker C. C. Ice-Liquid Interfaces [#6006] A one-dimensional model of salt entrainment in planetary ices — implications for icy world geodynamics, habitability, and spacecraft data analysis. 4:20 p.m. Discussion Tuesday, May 21, 2019 POSTER SESSION 5:00 p.m. USRA Education Gallery Authors Abstract Title and Summary Hay H. de Kleer K. McEwen A. Park R. S. Tidal Heating: Lessons from Io and the Jovian Bierson C. J. Davies A. G. DellaGiustina D. System (Report from the KISS Workshop) [#6035] Ermakov A. I. Fuller J. Hamilton C. Harris C. Summary of the Keck Institute for Space Studies Jacobson R. A. Keane J. Kestay L. Khurana K. workshop entitled “Tidal Heating: Lessons from Io Kirby K. Lainey V. Matsuyama I. McCarthy C. and the Jovian System,” held on October 15– Nimmo F. Panning M. Pommier A. Rathbun J. 19, 2018. Steinbrügge G. Stevenson D. Tsai V. C. Turtle E. Nixon C. A. Hewagama T. Bower D. M. Field Study of a Europa Analog Environment Eigenbrode J. L. Regberg A. B. Cousins C. R. in Iceland [#6013] Stern J. C. Wasser M. In August 2018 a NASA GSFC-led team studied a Europa analog site in Iceland. A multi-instrument approach was used to characterize the geochemical and bacterial environment. Preliminary results from the study will be described. Wagner N. Y. Hahn A. S. Andersen D. Roy C. Metagenomic Profiling of the Methane-Rich Anoxic Wilhelm M. B. Vanderwilt M. Johnson S. S. Waters of Lake Untersee as an Ocean Worlds Analog [#6025] Samples were collected along the water column of the anoxic basin of Lake Untersee in Antarctica, a methane-rich environment. DNA and RNA were extracted and sequenced in order to build a microbial profile and analyze gene clusters and active pathways. Wolfenbarger N. S. Soderlund K. M. Revisiting the Salt Distribution Coefficient for Icy Blankenship D. D. Ocean Worlds [#6026] Here we summarize existing empirical salt distribution coefficient relationships, evaluate these relationships in context of additional ice core data, and discuss where these relationships might be applicable to processes on icy ocean worlds. Shank T. M. Machado C. German C. R. Development of a New Class of Autonomous Bowen A. Leichty J. M. Klesh A. T. Smith R. G. Underwater Vehicle (AUV), Orpheus, for the Hand K. P. Exploration of Ocean World Analogues [#6021] The development of the new Orpheus class AUV is aimed to pursue the habitability of life on Earth and foremost questions in hadal research (6– 11 km depth), as well as from ice-covered poles to the (Ocean World analogs that are) deepest trenches. Craft K. L. Meyer-Dombard D. R. Dombard A. J. Dive! Dive! Dive! To Europa’s Ocean, a Tunnelbot Oleson S. L. Newman J. M. Concept Study [#6012] NASA Glenn Compass Team Here, we present a nuclear powered robotic mission concept to tunnel into Europa until reaching the ocean, then sample for signatures of life and assess habitability. Craft K. L. Hand K. P. Phillips C. B. Digging Into the Ice: The Europa Lander Cable M. L. Hoffmann A. E. Mission Concept [#6014] Europa Project Science and Engineering Europa Lander mission concept updates. Europa Lander would seek to further explore Europa’s chemistry, geology, geophysics, and habitability from a landed perspective, into the ice. Lorenz R. D. Panning M. Staehler S. C. Probing the Internal Structure of the Most Shiraishi H. Yamada R. Turtle E. P. Accessible Ocean World: Titan Seismology with Dragonfly [#6031] Dragonfly can sound / Ocean World’s interior / Using seismic waves. Kotlarz J. P. Kubiak K. A. Zalewska N. E. Potential Biological Component of the Enceladus Environment. Kinetic Simulation for the 10 km Thick Ocean Model [#6001] Habitable conditions of the Enceladus’ subsurface ocean are research object in the Institute of Aviation in Warsaw (Poland). Our paper presents first results of kinetic (particle-in-cell) simulation of the ocean parameters with biological component. Kay J. P. Rhoden A. R. Stickle A. M. Investigating the Effects of Shallow Liquid Water on Crater Formation [#6004] Craters into ice / May reveal hidden layers / Model all the things. Wong T. Hansen U. Wiesehöfer T. Stellmach S. Layer Formation and Evolution in Icy Satellite McKinnon W. B. Subsurface Oceans by Double- Diffusive Convection [#6032] Europa’s subsurface ocean can be layered by the process of double-diffusive convection, which affect heat and material transport through the ocean. The ice-water and water-rock interactions may affect the survival of layers in the ocean.
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