Age models and stable isotope analysis on sediment core Site 199-1218 from the equatorial Pacific

A 13-million-year continuous record of Oligocene climate from the equatorial Pacific reveals a pronounced "heartbeat" in the global carbon cycle and periodicity of glaciations. This heartbeat consists of 405,000-, 127,000-, and 96,000-year eccentricity cycles and 1.2-million-year obliquity cycles in periodically recurring glacial and carbon cycle events. That climate system response to intricate orbital variations suggests a fundamental interaction of the carbon cycle, solar forcing, and glacial events. Box modeling shows that the interaction of the carbon cycle and solar forcing modulates deep ocean acidity as well as the production and burial of global biomass. The pronounced 405,000-year eccentricity cycle is amplified by the long residence time of carbon in the oceans.

来自赤道太平洋的渐新世（Oligocene）1300万年连续气候记录，揭示了全球碳循环与冰川作用周期性中显著的“心跳”信号。该“心跳”信号由周期性出现的冰川事件与碳循环事件中的40.5万年、12.7万年及9.6万年偏心率周期，以及120万年倾角周期构成。气候系统对复杂轨道变率的响应，表明碳循环、太阳辐射强迫与冰川事件之间存在根本性相互作用。箱式模型研究显示，碳循环与太阳辐射强迫的相互作用可调控深海酸度以及全球生物量的产生与埋藏过程。显著的40.5万年偏心率周期，因碳在海洋中的长滞留时间而被放大。