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- Title
Orbital- and millennial-scale Asian winter monsoon variability across the Pliocene–Pleistocene glacial intensification.
- Authors
Ao, Hong; Liebrand, Diederik; Dekkers, Mark J.; Roberts, Andrew P.; Jonell, Tara N.; Jin, Zhangdong; Song, Yougui; Liu, Qingsong; Sun, Qiang; Li, Xinxia; Huang, Chunju; Qiang, Xiaoke; Zhang, Peng
- Abstract
Intensification of northern hemisphere glaciation (iNHG), ~2.7 million years ago (Ma), led to establishment of the Pleistocene to present-day bipolar icehouse state. Here we document evolution of orbital- and millennial-scale Asian winter monsoon (AWM) variability across the iNHG using a palaeomagnetically dated centennial-resolution grain size record between 3.6 and 1.9 Ma from a previously undescribed loess-palaeosol/red clay section on the central Chinese Loess Plateau. We find that the late Pliocene–early Pleistocene AWM was characterized by combined 41-kyr and ~100-kyr cycles, in response to ice volume and atmospheric CO2 forcing. Northern hemisphere ice sheet expansion, which was accompanied by an atmospheric CO2 concentration decline, substantially increased glacial AWM intensity and its orbitally oscillating amplitudes across the iNHG. Superposed on orbital variability, we find that millennial AWM intensity fluctuations persisted during both the warmer (higher-CO2) late Pliocene and colder (lower-CO2) early Pleistocene, in response to both external astronomical forcing and internal climate dynamics. Persistent millennial Asian winter monsoon variability is shown to be superposed on orbital 41-kyr and 100-kyr cycles across the Pliocene–Pleistocene glacial intensification using a paleomagnetically dated high-resolution Chinese Loess Plateau grain size record.
- Subjects
PLIOCENE-Pleistocene boundary; STALACTITES &; stalagmites; WINTER; ICE sheets; MILANKOVITCH cycles; GRAIN size; MONSOONS; PLEISTOCENE Epoch
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-47274-9