Affiliation:
1. Department of Archaeology and Anthropology University of Chinese Academy of Sciences Beijing China
2. Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing China
3. College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China
4. Department of Palynology and Climate Dynamics University of Göttingen Göttingen Germany
Abstract
AbstractThe change in vegetation at the margins of the East Asian summer monsoon (EASM) during the Miocene Climatic Optimum (MCO) remains poorly understood. Here, we present a high‐resolution terrestrial sequence, paleomagnetically dated to 18.2–13.5 Ma, from the Tongxin Basin of midwestern China. Our multi‐indicator analysis, encompassing pollen, δ13CTOC, δ18Ocarb‐δ13Ccarb, and magnetic susceptibility, reveals that the regional vegetation and climate had two distinct stages during the MCO, manifesting as stable arid steppe from 17.0 to 16.0 Ma, and woodland steppe with six forested environments from 16.0 to 14.0 Ma. Together with other adjacent records, this supports the EASM as the main control on terrestrial vegetation. Further comparisons of marine‐terrestrial data and time series analysis suggest that in the late MCO, the oceanic carbon reservoir (OCR) experienced strong perturbations (mainly Cmax events) accompanied by multiple oscillations. The instability signals likely impacted and were amplified as rapid shifts in forest‐steppe environments at the monsoon margins via EASM. Our study highlights the regulation of inland ecologically vulnerable areas by low‐latitude forcing in a greenhouse world.
Funder
National Nature Science Foundation of China
Chinese Academy of Sciences
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Publisher
American Geophysical Union (AGU)