Since HiGEM has a high resolution atmosphere coupled to a high resolution ocean, it can simulate local, coupled air-sea interactions on relatively fine scales. One of the scales that is resolved by HiGEM is the interaction of Tropical Instability Waves (TIWs) with the tropical atmosphere. Results will be presented showing that the structure of the atmospheric response to the TIWs is very similar to that seen in QuikSCAT imagery with regions of windstress divergence seen along the cross-wind SST fronts. This suggests that HiGEM is capable of simulating the coupled small-scale interactions between oceanic TIWs and the tropical atmosphere. One important question raised by these results is how the interaction between TIWs and the atmosphere in HiGEM might be parametrised in a lower resolution coupled climate models.
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