It is suggested that the seasonal dependence of interannual variability displayed by observed sea surface temperature (SST) over the north tropical Atlantic primarily reflects the seasonality of the remote forcing associated with the North Atlantic and Southern Oscillations and is controlled by the mean damping time scale of SST anomaly. A stochastic model including a seasonally dependent forcing is used to test this hypothesis against observations.
Corresponding author address: Dr. Arnaud Czaja, Department of Earth, Ocean, and Planetary Sciences, Massachusetts Institute of Technology, Rm. 54-1517, 77 Massachusetts Avenue, Cambridge, MA 02139. Email: email@example.com