Validating and understanding the ENSO simulation in two coupled climate models
Open Access
- 1 January 2007
- journal article
- Published by Stockholm University Press in Tellus A: Dynamic Meteorology and Oceanography
- Vol. 59 (3), 292-308
- https://doi.org/10.1111/j.1600-0870.2007.00231.x
Abstract
A newly developed Atmospheric General Circulation Model (AGCM) at T62 spectral truncation with 28 terrainfollowing levels coupled to the Modular Ocean Model version 3.0 (MOM3.0) is evaluated for its simulation of El Ni˜no and the Southern Oscillation (ENSO). It is also compared with an older version of the AGCM coupled to the same ocean model. A dozen features of ENSO are validated. These characteristics of ENSO highlight its influence on global climate at seasonal to interannual scales. The major improvements of the ENSO simulation from this new coupled climate model are the seasonal phase locking of the ENSO variability to a realistic annual cycle of the eastern equatorial Pacific Ocean, the duration of the ENSO events and its evolution that is comparable to the ocean data assimilation. The two apparent drawbacks of this new model are its relatively weak ENSO variability and the presence of erroneous split ITCZ. The improvement of the ENSO simulation in the new coupled model is attributed to realistic thermocline variability and wind stress simulation.
Keywords
This publication has 48 references indexed in Scilit:
- El Niño: Catastrophe or OpportunityJournal of Climate, 2005
- Significant Change of Extratropical Natural Variability Associated with Tropical ENSO AnomalyJournal of Climate, 2004
- Tropical Atlantic sea surface temperature variability and its relation to El Niño‐Southern OscillationJournal of Geophysical Research: Oceans, 1997
- Secular Changes of Annual and Interannual Variability in the Tropics during the Past CenturyJournal of Climate, 1995
- Oceanic vertical mixing: A review and a model with a nonlocal boundary layer parameterizationReviews of Geophysics, 1994
- Eddy Diffusivity and Countergradient Transport in the Convective Atmospheric Boundary LayerJournal of the Atmospheric Sciences, 1991
- Isopycnal Mixing in Ocean Circulation ModelsJournal of Physical Oceanography, 1990
- Global and Regional Scale Precipitation Patterns Associated with the El Niño/Southern OscillationMonthly Weather Review, 1987
- El Niño Southern Oscillation phenomenaNature, 1983
- Development of a turbulence closure model for geophysical fluid problemsReviews of Geophysics, 1982