论文标题
确定性激发范式和晚更新世冰川终止
The deterministic excitation paradigm and the late Pleistocene glacial terminations
论文作者
论文摘要
制定了确定性激发（DE）范式，根据该范式，在没有任何随机性参数化的情况下，在没有轨道强迫的情况下，晚期更新世冰川终止与轨道强迫，非线性弛豫振荡（ROS）对应于激发。特定的阈值交叉规则参数化导致RO激发的内部气候反馈的激活是根据DE假设得出的。然后将它们应用于一个能量平衡模型，该模型描述了在冰川状态下逼真的轨道强迫引起的波动。因此，发现在参考模拟中获得的冰川终止的时间与代理记录非常吻合。灵敏度分析确保时间安排的鲁棒性。讨论了允许DE持有的噪声的潜在无关紧要，并概述了基于DE的100公斤循环问题的可能解释。总之，DE范式以最简单的方式来表征Milankovitch假设所隐含的轨道强迫和冰川终止之间的联系之一。
A deterministic excitation (DE) paradigm is formulated, according to which the late Pleistocene glacial terminations correspond to the excitation, by the orbital forcing, of nonlinear relaxation oscillations (ROs) internal to the climate system in the absence of any stochastic parameterization. Specific threshold crossing rules parameterizing the activation of internal climate feedbacks leading to RO excitations are derived according to the DE assumption. They are then applied to an energy balance model describing the fluctuations induced by realistic orbital forcing on the glacial state. The timing of the glacial terminations thus obtained in a reference simulation is found to be in good agreement with proxy records. A sensitivity analysis insures the robustness of the timing. The potential irrelevance of noise allowing DE to hold is discussed, and a possible explanation of the 100-kyr cycle problem based on DE is outlined. In conclusion, the DE paradigm characterizes in one of the simplest possible ways the link between orbital forcing and glacial terminations implied by the Milankovitch hypothesis.
