Two-stage mid-Brunhes climate transition and mid-Pleistocene human diversification
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چکیده
منابع مشابه
Gradual and abrupt changes during the Mid-Pleistocene Transition
During the Mid-Pleistocene Transition (MPT), the dominant glacial-interglacial cyclicity as inferred from the marine d18O records of benthic foraminifera (dObenthic) changed from 41 kyr to 100 kyr years in the absence of a comparable change in orbital forcing. Currently, only two Mg/Ca-derived, high-resolution bottom water temperature (BWT) records exist that can be used with dObenthic records ...
متن کاملThermohaline circulation crisis and impacts during the mid-Pleistocene transition.
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 ...
متن کاملMid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias Mountains, Alaska.
Erosion, sediment production, and routing on a tectonically active continental margin reflect both tectonic and climatic processes; partitioning the relative importance of these processes remains controversial. Gulf of Alaska contains a preserved sedimentary record of the Yakutat Terrane collision with North America. Because tectonic convergence in the coastal St. Elias orogen has been roughly ...
متن کاملConcluding remarks: Southern hemisphere paleoceanography in a global climate change context during the Mid-Pleistocene Transition
In this chapter, the foraminiferal faunal patterns of Core T89-40 are placed in a global palaeoceanographic context. The surface waters of the core location are influenced by the extent of the subtropical gyre versus the Benguela Upwelling System, in turn driven by a complex interaction between atmospheric circulation patterns. The planktonic foraminiferal record of Core T89-40 shows that maxim...
متن کاملCauses of ice age intensification across the Mid-Pleistocene Transition
During the Mid-Pleistocene Transition (MPT; 1,200-800 kya), Earth's orbitally paced ice age cycles intensified, lengthened from ∼40,000 (∼40 ky) to ∼100 ky, and became distinctly asymmetrical. Testing hypotheses that implicate changing atmospheric CO2 levels as a driver of the MPT has proven difficult with available observations. Here, we use orbitally resolved, boron isotope CO2 data to show t...
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ژورنال
عنوان ژورنال: Earth-Science Reviews
سال: 2020
ISSN: 0012-8252
DOI: 10.1016/j.earscirev.2020.103354