木卫二上CO$_2$的分布表明其存在内部碳源
The distribution of CO$_2$ on Europa indicates an internal source of carbon
AI总结：
利用JWST观测绘制木卫二表面CO$_2$分布图，发现其在Tara Regio区域富集，表明CO$_2$来源于内部碳源，最可能形成于地下海洋。
摘要：
木星的卫星木卫二拥有一个地下海洋，其化学成分在很大程度上尚不清楚。此前已在木卫二表面探测到二氧化碳（CO$_2$），但无法确定它究竟是来源于地下海洋的化学过程、由撞击体输送而来，还是在表面由撞击输送物质经辐射处理而产生。我们利用詹姆斯·韦布空间望远镜（JWST）获得的观测数据绘制了木卫二表面CO$_2$的分布图，并在Tara Regio这一近期经历过表面重塑的区域发现了CO$_2$的富集。这表明CO$_2$来源于内部碳源。我们提出CO$_2$形成于内部海洋中，但也不能排除其由海洋来源的有机物或碳酸盐在表面经辐射分解转化而形成的可能性。
英文摘要：
Jupiter's moon Europa has a subsurface ocean, the chemistry of which is largely unknown. Carbon dioxide (CO$_2$) has previously been detected on the surface of Europa, but it was not possible to determine whether it originated from subsurface ocean chemistry, was delivered by impacts, or was produced on the surface by radiation processing of impact-delivered material. We map the distribution of CO$_2$ on Europa using observations obtained with the James Webb Space Telescope (JWST) and find a concentration of CO$_2$ within Tara Regio, a recently resurfaced terrain. This indicates the CO$_2$ is derived from an internal carbon source. We propose the CO$_2$ formed in the internal ocean, though we cannot rule out formation on the surface by radiolytic conversion of ocean-derived organics or carbonates.
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