Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records
Brown, J.; Collins, M.; Tudhope, A. (2006). Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records. Adv. Geosci. 6: 29-33
In: Advances in Geosciences. Copernicus Publications: Göttingen. ISSN 1680-7340; e-ISSN 1680-7359, meer
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El Nino phenomena
Geological time > Phanerozoic > Geological time > Cenozoic > Quaternary > Holocene
Isotopes > Oxygen isotopes
Oscillations > Southern oscillation
Marien/Kust |
| Auteurs | | Top |
- Brown, J.
- Collins, M.
- Tudhope, A.
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| Abstract |
The sensitivity of El Niño-Southern Oscillation (ENSO) to changes in mean climate is investigated for simulations of pre-industrial and mid-Holocene (6000 years before present) climate using the Hadley Centre coupled atmosphere-ocean model, HadCM3. Orbitally-forced changes in insolation in the mid-Holocene produce changes in seasonality which may alter ENSO amplitude and frequency. The model simulations are compared with mid- Holocene fossil coral oxygen isotope records from the western Pacific Warm Pool. The coral records imply a reduction of around 60% in the amplitude of interannual variability associated with ENSO in the mid-Holocene, while the model simulates a smaller reduction in ENSO amplitude of around 10%. The model also simulates a slight shift to longer period variability and a weakening of ENSO phase-locking to the seasonal cycle in the mid-Holocene. There is little change in the pattern of ENSO tropical precipitation teleconnections in the simulated mid-Holocene climate. |
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