资源环境科技发展态势分析平台

Ganymede has strong evidence of a subsurface ocean primarily composed of MgSO₄. We conducted experimental measurements of the electrical conductivity of aqueous MgSO₄ at 200‐1200 MPa and 243‐295 K in a multi‐anvil press, simulating the high‐pressure and low‐temperature (HPLT) conditions of Ganymede's subsurface ocean. A numerical model is proposed with logσ =  − 3.1605+940.931/T+0.8986logc+2logΛ⁰ − log(5Λ⁰+2695c^1/2), where σ is electrical conductivity in S/m, T is temperature in K, c is molar concentration in mol/L, and Λ⁰ is limiting equivalent conductance in S·cm²·equiv^‐1. We used this model to generate electrical conductivity curves up to 500 km deep in Ganymede and found that the values are lower than previously predicted. Our novel experimental methods demonstrate access to the HPLT environment of liquid samples that expands our ability for experimental simulation of icy‐ocean worlds in the outer solar system.