| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics
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| Autores: |
Jian, Zhimin
Wang, Yue
Dang, Haowen
Lea, David W.
Liu, Zhengyu
Jin, Haiyan
Yin, Yaqian
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| Data: |
2020-03
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| Ano: |
2020
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| Palavras-chave: |
Thermocline temperature
Half-precession
Western equatorial Pacific
Meridional gradient
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| Resumo: |
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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
https://archimer.ifremer.fr/doc/00614/72647/71649.pdf
https://archimer.ifremer.fr/doc/00614/72647/71650.pdf
DOI:10.1073/pnas.1915510117
https://archimer.ifremer.fr/doc/00614/72647/
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| Editor: |
Proceedings of the National Academy of Sciences
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| Formato: |
application/pdf
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| Fonte: |
Proceedings Of The National Academy Of Sciences Of The United States Of America (0027-8424) (Proceedings of the National Academy of Sciences), 2020-03 , Vol. 117 , N. 13 , P. 7044-7051
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| Direitos: |
info:eu-repo/semantics/openAccess
restricted use
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