The Mid-Pleistocene Transition: a delayed response to an increasing positive feedback?
The Mid-Pleistocene Transition: a delayed response to an increasing positive feedback?
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DOI：
10.1007/s00382-022-06544-2
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发表时间：
2023
期刊：
影响因子：
4.6
通讯作者：
Omta, A. W.
中科院分区：
文献类型：
--
作者：
Shackleton, J. D.;Follows, M. J.;Thomas, P. J.;Omta, A. W.
冰期-间冰期旋回构成了地球气候的巨大自然变化。中更新世过渡（MPT）标志着这些气候周期的主导周期由中更新世向中更新世转变。最近，有人提出这种转变是由于系统内部周期的逐渐增加（或等效地，固有频率的减少）造成的。其结果是，该系统将锁定在外部强迫周期的更高倍数上。我们发现内周期对气候系统的正反馈强度非常敏感。利用钙化菌群和海洋碱度之间的反馈调节大气CO的碳循环模型，我们通过这种机制模拟了类似于MPT的逐步周期性变化。由于系统的内部动力学，在反馈强度的变化被施加后，周期位移会发生长达数百万年。这表明MPT的原因可能在观测到的周期性移动之前发生了很长时间。
Glacial–interglacial cycles constitute large natural variations in Earth’s climate. The Mid-Pleistocene Transition (MPT) marks a shift of the dominant periodicity of these climate cycles from to kyr. Recently, it has been suggested that this shift resulted from a gradual increase in the internal period (or equivalently, a decrease in the natural frequency) of the system. As a result, the system would then have locked to ever higher multiples of the external forcing period. We find that the internal period is sensitive to the strength of positive feedbacks in the climate system. Using a carbon cycle model in which feedbacks between calcifier populations and ocean alkalinity mediate atmospheric CO we simulate stepwise periodicity changes similar to the MPT through such a mechanism. Due to the internal dynamics of the system, the periodicity shift occurs up to millions of years after the change in the feedback strength is imposed. This suggests that the cause for the MPT may have occurred a significant time before the observed periodicity shift.
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DOI：
10.1073/pnas.1702143114
发表时间：
2017-12-12
影响因子：
11.1
作者：
Chalk TB;Hain MP;Foster GL;Rohling EJ;Sexton PF;Badger MPS;Cherry SG;Hasenfratz AP;Haug GH;Jaccard SL;Martínez-García A;Pälike H;Pancost RD;Wilson PA
通讯作者：
Wilson PA
DOI：
10.1016/0198-0149(81)90121-7
发表时间：
1981-01-01
期刊：
DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS
影响因子：
--
作者：
DICKSON, AG
通讯作者：
DICKSON, AG
DOI：
10.1016/s0031-0182(03)00467-x
发表时间：
2003-08-01
影响因子：
3
作者：
Flores, JA;Marino, M;Charles, CD
通讯作者：
Charles, CD
影响因子：
18.3
作者：
Farmer, J. R.;Honisch, B.;Kim, J.
通讯作者：
Kim, J.
影响因子：
64.8
作者：
Bintanja, R.;van de Wal, R. S. W.
通讯作者：
van de Wal, R. S. W.