scholarly journals The amplitude and phasing of climate change during the last deglaciation in the Sulu Sea, western equatorial Pacific

2003 ◽  
Vol 30 (8) ◽  
Author(s):  
Yair Rosenthal ◽  
Delia W. Oppo ◽  
Braddock K. Linsley
Keyword(s):  
Climate Change ◽  
Equatorial Pacific ◽  
Last Deglaciation ◽  
Sulu Sea ◽  
Western Equatorial Pacific ◽  
The Last Deglaciation

scholarly journals Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics

2020 ◽  
Vol 117 (13) ◽  
pp. 7044-7051
Author(s):  
Zhimin Jian ◽  
Yue Wang ◽  
Haowen Dang ◽  
David W. Lea ◽  
Zhengyu Liu ◽  
...  
Keyword(s):  
Climate Change ◽  
Southern Oscillation ◽  
Decisive Role ◽  
Equatorial Pacific ◽  
The Pacific ◽  
Equatorial Thermocline ◽  
Western Equatorial Pacific ◽  
Tightly Coupled ◽  
Interannual Climate Variability

The El Niño−Southern Oscillation (ENSO), which is tightly coupled to the equatorial thermocline in the Pacific, is the dominant source of interannual climate variability, but its long-term evolution in response to climate change remains highly uncertain. This study uses Mg/Ca in planktonic foraminiferal shells to reconstruct sea surface and thermocline water temperatures (SST and TWT) for the past 142 ky in a western equatorial Pacific (WEP) core MD01-2386. Unlike the dominant 100-ky glacial−interglacial cycle recorded by SST and δ18O, which echoes the pattern seen in other WEP sites, the upper ocean thermal gradient shows a clear half-precessional (9.4 ky or 12.7 ky) cycle as indicated by the reconstructed and simulated temperature (ΔT) and δ18O differences between the surface and thermocline waters. This phenomenon is attributed to the interplay of subtropical-to-tropical thermocline anomalies forced by the antiphased meridional insolation gradients in the two hemispheres at the precessional band. In particular, the TWT shows greater variability than SST, and dominates the ΔT changes which couple with the west−east SST difference in the equatorial Pacific at the half-precessional band, implying a decisive role of the tropical thermocline in orbital-scale climate change.

scholarly journals Cosmogenic 10Be chronology of the last deglaciation of western Ireland, and implications for sensitivity of the Irish Ice Sheet to climate Change

2006 ◽  
Vol preprint (2008) ◽  
pp. 1 ◽  
Author(s):  
Jorie Clark ◽  
A. Marshall McCabe ◽  
Christoph Schnabel ◽  
Peter U. Clark ◽  
Stephen McCarron ◽  
...  
Keyword(s):  
Climate Change ◽  
Ice Sheet ◽  
Last Deglaciation ◽  
The Last Deglaciation ◽  
Western Ireland ◽  
Cosmogenic 10Be

Dating rapid climate change in the North Atlantic during Heinrich Stadial 1

2020 ◽  
Author(s):  
Andrea Burke ◽  
Rosanna Greenop ◽  
James Rae ◽  
Rhian Rees-Owen ◽  
Paula Reimer ◽  
...  
Keyword(s):  
Climate Change ◽  
Ocean Circulation ◽  
North Atlantic ◽  
Sediment Cores ◽  
Last Deglaciation ◽  
Large Reservoir ◽  
The North ◽  
The Last Deglaciation ◽  
The North Atlantic ◽  
Reservoir Age

<p>Paleoclimate records from the North Atlantic show some of the most iconic signals of abrupt climate change during the ice ages. Here we use radiocarbon as a tracer of ocean circulation and air-sea gas exchange to investigate potential mechanisms for the abrupt climate changes seen in the North Atlantic over the last deglaciation. We have created a stack of North Atlantic surface radiocarbon reservoir ages over the past 20,000 years, using new synchronized age models from thirteen sediment cores refined with thorium normalization between tie-points. This stack shows consistent and large reservoir age increases of more than 1000 years from the LGM into HS1, dropping abruptly back to approximately modern reservoir ages before the onset of the Bolling-Allerod. We use the intermediate complexity earth system model cGENIE to investigate the potential drivers of these reservoir age changes. We find that sea ice, circulation and CO<sub>2</sub> all play important roles in setting the reservoir age. We use these coherently dated records to revisit the sequence and timing of climatic events during HS1 and the last deglaciation, and show that Laurentide Heinrich Events are a response to stadial conditions, rather than their root cause.</p>

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