The continuous growth of atmospheric nitrous oxide (N2O) is of concern for its potential role in global warming and future stratospheric ozone destruction. Climate feedbacks that enhance N2O emissions in response to global warming are not well understood, and past records of N2O from ice cores are not sufficiently well resolved to examine the underlying climate-N2O feedbacks on societally relevant time scales. Here, we present a new high-resolution and high-precision N2O reconstruction obtained from the Greenland NEEM (North Greenland Eemian Ice Drilling) and the Antarctic Styx Glacier ice cores. Covering the N2O history of the past two millennia, our reconstruction shows a centennial-scale variability of ~10 ppb. A pronounced minimum at ~600 CE coincides with the reorganizations of tropical hydroclimate and ocean productivity changes. Comparisons with proxy records suggest association of centennial- to millennial-scale variations in N2O with changes in tropical and subtropical land hydrology and marine productivity.

中文翻译：

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过去两千年中百年时间尺度上的大气一氧化二氮变化

大气中一氧化二氮 (N2O) 的持续增长因其在全球变暖和未来平流层臭氧破坏中的潜在作用而受到关注。对响应全球变暖而增加 N2O 排放的气候反馈尚不清楚，过去冰芯 N2O 的记录也没有得到充分解决，无法在社会相关的时间尺度上检查潜在的气候 - N2O 反馈。在这里，我们展示了从格陵兰 NEEM（北格陵兰 Eemian 冰钻）和南极 Styx 冰川冰芯获得的新的高分辨率和高精度 N2O 重建。涵盖过去两千年的 N2O 历史，我们的重建显示了约 10 ppb 的百年尺度变化。公元 600 年左右的明显最小值与热带水文气候和海洋生产力变化的重组相吻合。