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Suborbital- and millennial-scale monsoon variability during Pleistocene interglacials.
Youbin Sun1, Ting Wang1,2, Qiuzhen Yin3
1State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China.
Summary
Extreme climate events are intensifying with global warming. This study reveals abrupt climate changes amplified during past warm periods, driven by low-latitude insolation, impacting future hydroclimatic variability.
Area of Science:
- Paleoclimatology
- Climate modeling
- Quaternary geology
Background:
- Global warming is increasing extreme climate events.
- Past abrupt climate changes during warm periods are poorly understood due to limited geological data.
Purpose of the Study:
- To investigate abrupt climate changes during past warm periods using high-resolution geological records.
- To understand the drivers of millennial-scale hydroclimatic variability.
Main Methods:
- Analysis of a 512-m lacustrine sedimentary record from the Weihe Basin (North China) spanning the last 2 million years.
- Grain-size analysis to reconstruct lake level fluctuations.
- Proxy-model comparison integrating observational and modeling results.
Main Results:
- Significant lake level fluctuations occurred on suborbital and millennial timescales over the last 2 Ma.
- Magnitudes of rapid lake level fluctuations increased dramatically during Pleistocene interglacials.
- Low-latitude bihemispheric summer insolation maxima intensified East Asian monsoon precipitation.
Conclusions:
- Abrupt climate changes intensified during past warm periods, particularly during interglacials.
- Low-latitude insolation is a key driver of millennial-scale hydroclimatic variability.
- Findings highlight potential hydroclimatic shifts in a warming future.
Keywords:
East Asian monsoonLow-latitude insolation forcingPleistocene interglacialsSuborbital- and millennial-scale variabilityMore Related Videos
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