国际研究团队通过实验室模拟发现，土星卫星恩克拉多斯喷射的冰粒具有不寻常的化学多样性1。这一发现来自对卡西尼号探测器数据的深入分析——该探测器在2004年至2017年间测量了961个富盐冰粒的质量谱1。研究人员利用实验室实验解释了这些观测数据中的异常现象，发现冻结速度对冰粒中的化学成分分布产生了关键影响1。
根据研究，当直径约200微米的水滴冻结速度约为每分钟10K或更慢时，会发生盐类分离1。相比之下，快速冻结会保持化学成分的均匀混合，而缓慢冻结则产生化学多样性1。研究团队指出，恩克拉多斯冰壳下的大洋喷雾在深层缓慢冻结，随后在上升过程中于狭窄冰通道中高速撞击破裂1。这一物理过程可能使有机物质在某些冰粒中浓缩，这将大幅简化未来探测器搜寻生命迹象的工作1。
An international research team has discovered that ice particles blasting from Saturn's moon Enceladus exhibit unusual chemical diversity 1. Through laboratory experiments, researchers found that this compositional variety stems from chemical separation occurring as water droplets beneath Enceladus's ice shell freeze gradually 1.
The findings help explain anomalies detected by NASA's Cassini spacecraft, which measured the mass spectra of 961 salt-rich ice particles between 2004 and 2017 1. Experiments revealed that when water droplets approximately 200 micrometers in diameter freeze at rates of 10 Kelvin per minute or slower, salts separate from the ice 1. In contrast, rapid freezing preserves uniform chemical composition throughout the particles 1. The research indicates that ocean spray freezes slowly at depth within the ice shell, then fractures at high speed as it travels upward through narrow ice channels 1. This process may concentrate organic material in certain ice particles, potentially simplifying the search for biosignatures by future spacecraft 1.
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