Two major processes associated with the variability of the LLCJ, Ekman transport and air-sea net heat flux exchange, are investigated. The results indicate that the net heat flux exchange, including the shortwave and longwave radiation and latent and sensible heat flux, is the most prominent process modulating the SST change during both the strong- and weak-jet periods. The maximum SST cooling by the net heat flux is 31% more than by the Ekman transport during the strong-jet period.
The net heat-flux-induced cooling occurs over most of the domain, while the cooling by the Ekman transport occurs within an offshore distance of 500-1000 km. The SST warming during the weak-jet period is also mainly by the net-heat-flux exchange, with a contribution of 71% for the maximum warming. The higher resolution of the two-way-coupled, air-ocean, model simulation provides more detailed insight into the relative roles of the two processes in modulating the SST change.