image: Eccentricity of the Earth's orbit around the Sun. The fluctuation between a nearly circular and elliptical orbit drives cyclic changes in the Earth's environment, including the global carbon cycle. view more
Credit: Image courtesy of Marisa S. Storm.
科研人员报告了来自威尔士的一块泥岩芯的碳同位素数据，它表明了侏罗纪早期的碳同位素历史；这些结果表明，这个同位素记录的异常符合数量级大约405,000 年的轨道周期，这既提示了这些轨道信号能够用于区分影响碳同位素比例的其他因素，也提示了海洋碳周期对于这类天文参数特别敏感。
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Journal
Proceedings of the National Academy of Sciences