![equilibrium enso equilibrium enso](https://d2sso8vnfo8mtp.cloudfront.net/app/uploads/2021/03/eq-enso-1024x1024.jpg)
2a, but for the (a) subsurface temperature, (b) upwelling, (c) thermocline depth of the eastern equatorial Pacific (anomaly), and (d) depth of the thermocline in the western equatorial Pacific (anomaly). Note that the rate of increase in the zonal contrast in the time-mean state with T e is less than half of the corresponding rate of increase in the equilibrium state (0.25 vs 0.56). Also shown are the zonal SST contrast as measured by the difference between T 1 and T 2 for the equilibrium state (red) and the time-mean state (blue). The amplitude is defined here as the half-value of the difference between the maximum and minimum value of T 2. (b) Amplitude of oscillation for T 2 as a function of T e.
![equilibrium enso equilibrium enso](https://quadracer.com.au/wp-content/uploads/2020/11/2-1.jpg)
Solid lines are for the time-mean state, and the dashed lines are for the equilibrium state. (a) Equatorial Pacific SST as a function of T e T 1 and T 2 are, respectively, for the western and eastern Pacific SST. (SST data used are from the Hadley Center for Climate Prediction and Research) ( Rayner et al. Note that the epoch 1977–2003 has higher level of ENSO activity than the previous period 1950–76. The black solid line is the variance of Niño-3 SST anomalies obtained by sliding a moving window of a width of 16 yr. (a) SST differences between two epochs: 1977–20–76.