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Pacific warm pool subsurface heat sequestration modulated Walker circulation and ENSO activity during the Holocene
Haowen Dang1, Zhimin Jian2, Yue Wang1
1State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China.
Early and Middle Holocene thermocline warming in the Indo-Pacific warm pool reduced El Niño-Southern Oscillation (ENSO) activity. This oceanic heat content may influence future global warming.
Area of Science:
- Paleoclimatology
- Oceanography
- Climate Dynamics
Background:
- El Niño-Southern Oscillation (ENSO) dynamics on longer timescales remain poorly understood.
- The Indo-Pacific warm pool's role in past climate variability requires further investigation.
Purpose of the Study:
- To reconstruct thermocline temperature variations in the Indo-Pacific warm pool over the past 25,000 years.
- To investigate the relationship between Holocene insolation changes and ENSO activity.
Main Methods:
- Compilation of paleoceanographic proxy records for thermocline temperature.
- Analysis of insolation patterns and ocean circulation mechanisms.
Main Results:
- Identified major thermocline warming in the Early Holocene and secondary warming in the Middle Holocene.
- Linked Early Holocene warming to southern Pacific shallow overturning circulation and Middle Holocene warming to intensified Walker circulation.
- Observed reduced interannual ENSO activity during these warming periods.
Conclusions:
- Holocene warm pool thermocline warming acted as a negative feedback on ENSO.
- Increased oceanic heat content in the warm pool may have implications for understanding ongoing global warming and future ENSO behavior.
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