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Pliocene switch in orbital-scale carbon cycle/climate dynamics

机译：上新世在轨道尺度碳循环/气候动力学中的转换

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摘要

The high-frequency (periods of 10(5)years) relationship between carbon and oxygen isotopes in benthic foraminiferathe two proxies most extensively used to reconstruct past changes in Earth's carbon cycle and climateshows two distinct patterns across the Cenozoic. The first, glacial-style, pattern associates negative excursions in C-13 with positive excursions in O-18 indicative of relatively cold temperatures and greater ice volume. The second, hyperthermal-style, pattern associates negative excursions in C-13 with negative excursions in O-18 indicative of warming. Here I assess the coherence and phasing of these high-frequency, orbital-scale cycles (in particular, the 100 kyr eccentricity period) in C-13 and O-18 from multiple high-resolution benthic foraminiferal records spanning the last 65 million years of Earth history in order to identify which of these patterns is most persistent across the Cenozoic and when the switch between these patterns occurred. I find that the glacial-style C-13-O-18 pattern is a feature restricted to the Plio-Pleistocene, suggesting a fundamental change in the interplay between the carbon cycle and climate associated with the onset of Northern Hemisphere glaciation. This relative stability of the high-frequency relationship between C-13 and O-18 across most of the Cenozoic persists despite significant secular changes in climate and may suggest a dichotomous response of terrestrial carbon cycle dynamics to orbital forcing with a switch occurring in the last 5 Myr.
机译：底栖有孔虫中碳和氧同位素之间的高频关系（为期10（5）年），这两个最广泛用于重建地球碳循环和气候过去变化的代理显示了新生代的两种不同模式。第一种是冰川风格的模式，将C-13中的负偏移与O-18中的正偏移相关联，指示相对较低的温度和更大的冰量。第二种高温模式将C-13中的负偏移与O-18中的负偏移相关联，指示变暖。在这里，我从过去6500万年的多个高分辨率底栖有孔虫记录中，评估了C-13和O-18中这些高频轨道规模周期（特别是100 kyr偏心期）的连贯性和相位。地球历史，以便确定这些模式中哪一个在整个新生代中最持久，以及何时在这些模式之间进行切换。我发现，冰河风格的C-13-O-18模式是仅限于上新世的特征，这表明碳循环与气候之间相互作用的根本变化与北半球冰期的发生有关。尽管气候发生了明显的长期变化，但在大多数新生代中，C-13和O-18之间的高频关系仍保持相对稳定，这可能表明地球碳循环动力学对轨道强迫的二分反应，最后一次发生了转换。 5令吉。

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