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Article Dans Une Revue Advances in Geosciences Année : 2006

Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records

Résumé

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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Dates et versions

hal-00296878 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00296878 , version 1

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J. Brown, M. Collins, A. Tudhope. Coupled model simulations of mid-Holocene ENSO and comparisons with coral oxygen isotope records. Advances in Geosciences, 2006, 6, pp.29-33. ⟨hal-00296878⟩

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