期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 23, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL101280
关键词
East Asian summer monsoon; late Pliocene; Northern Hemisphere ice sheet; obliquity forcing
资金
- National Natural Science Foundation of China
- [42230208]
- [42172039]
Sedimentary archives from the Mio-Pliocene and Pleistocene periods in NE Tibet show a different response to orbital forcing. While the Mio-Pliocene records demonstrate a monotonic response dominated by eccentricity, the Pleistocene records display a more stochastic response that varies regionally and temporally. The transition between these two responses is attributed to the increase in Northern Hemisphere ice volume, leading to a decreased monsoonal rainfall in the late Pliocene and a heightened response to obliquity and climate stochasticity.
Mio-Pliocene sedimentary archives of the East Asian summer monsoon (EASM) in NE Tibet record a monotonic response to orbital forcing, dominated by eccentricity. By contrast, Pleistocene archives display a more stochastic response that varies regionally and temporally. When and why this response changed is poorly understood. Here, we present a new high-resolution Rb/Sr ratio data set of EASM intensity from the Sanmenxia Basin, North China, that spans the Plio-Pleistocene transition. Our results indicate decreased monsoonal rainfall in the late Pliocene, dated at 2.75-2.6 Ma, associated with an intensified response to obliquity and enhanced climate stochasticity. This transition is attributed to the increase of Northern Hemisphere ice volume. Quaternary monsoons display a sensitivity unique to the modern icehouse with large bipolar ice sheets, while pre-Quaternary monsoons were solely impacted by Antarctic ice sheet dynamics on orbital time-scales.
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