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On the potential role of marine calcifiers in glacial-interglacial dynamics

机译：海洋钙化剂在冰川-冰川间动力学中的潜在作用

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Ice core measurements have revealed a highly asymmetric cycle in Antarctic temperature and atmospheric CO_2 over the last 800 kyr. Both CO _2 and temperature decrease over 100 kyr going into a glacial period and then rise steeply over less than 10 kyr at the end of a glacial period. There does not yet exist wide agreement about the causes of this cycle or about the origin of its shape. Here we explore the possibility that an ecologically driven oscillator plays a role in the dynamics. A conceptual model describing the interaction between calcifying plankton and ocean alkalinity shows interesting features: (i) It generates an oscillation in atmospheric CO _2 with the characteristic asymmetric shape observed in the ice core record, (ii) the system can transform a sinusoidal Milankovitch forcing into a sawtooth-shaped output, and (iii) there are spikes of enhanced calcifier productivity at the glacial-interglacial transitions, consistent with several sedimentary records. This suggests that ecological processes might play an active role in the observed glacial-interglacial cycles.
机译：冰芯测量显示，过去800年来，南极温度和大气CO_2高度不对称。进入冰期期间，CO _2和温度都下降超过100 kyr，然后在冰期结束时，CO _2和温度都在不到10 kyr时急剧上升。关于这种循环的原因或其形状的起源，尚未达成广泛的共识。在这里，我们探讨了生态驱动的振荡器在动力学中起作用的可能性。描述钙化浮游生物与海洋碱度之间相互作用的概念模型显示出有趣的特征：（i）它会在大气CO _2中产生振荡，并具有在冰芯记录中观察到的特征性不对称形状;（ii）该系统可以转换正弦的Milankovitch强迫形成锯齿状的产出物;（iii）在冰川-冰晶间的过渡期，钙化剂的生产率提高了，这与一些沉积记录一致。这表明生态过程可能在观察到的冰川-冰川间周期中起积极作用。

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