|Thermohaline circulation crisis and impacts during the mid-Pleistocene transition|Pena, L.D.; Goldstein, S.L. (2014). Thermohaline circulation crisis and impacts during the mid-Pleistocene transition. Science (Wash.) 345(6194): 318-322. hdl.handle.net/10.1126/science.1249770
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075, more
|Authors|| || Top |
- Pena, L.D.
- Goldstein, S.L.
The mid-Pleistocene transition (MPT) marked a fundamental change in glacial-interglacial periodicity, when it increased from ~41-thousand-year to 100-thousand-year cycles and developed higher-amplitude climate variability without substantial changes in the Milankovitch forcing. Here, we document, by using Nd isotopes, a major disruption of the ocean thermohaline circulation (THC) system during the MPT between marine isotope stages (MISs) 25 and 21 at ~950 to 860 thousand years ago, which effectively marks the first 100-thousand-year cycle, including an exceptional weakening through a critical interglacial (MIS 23) at ~900 thousand years ago. Its recovery into the post-MPT 100-thousand-year world is characterized by continued weak glacial THC. The MPT ocean circulation crisis facilitated the coeval drawdown of atmospheric CO2 and high-latitude ice sheet growth, generating the conditions that stabilized 100-thousand-year cycles.