1. Harun Rashid Coupled Climate Modelling CSIRO Climate Science Centre
Tropical climate variability in a provisional version of the ACCESS-CM2
Harun Rashid
Coupled Climate Modelling
CSIRO Climate Science Centre

2. Spatial structures of ENSO and IOD
IOD: The IOD in ACCESS-CM2 is too strong compared to obs, and has an overly strong relationship with ENSO
ENSO: The ENSO structure in ACCESS-CM2 is meridionally confined and extends too far into the West Pacific

3. Seasonal phase locking of ENSO and IOD
The seasonal phase locking is similar to obs, except the minimum variance occurs in May instead of April.

4. Power spectra of the ENSO and IOD indices
IOD is too strong in both models
ENSO power peaks near 2-year period

5. Time mean SST, Taux and D20 along the equator
SST and ZWS: Lat-averaged over 5S-5N
D20: 0.5S-0.5N

6. Components of the Bjerknes’ feedback loop
In ACCESS-CM2, there is a too strong coupling between the CP-ZWS and EP-SST anomalies

7. Summary The simulated ENSO is too strong and its period is too short.
The simulated ENSO and IOD are strongly correlated.
The central Pacific ZWS anomalies are strongly coupled with the East Pacific SST anomalies.
The shapes of the lag-regression curves are indicative of strong oscillations because of tight coupling between the ZWS, D20 & SST anomalies.
ACCESS Workshop | Harun Rashid