This work was funded by an award, GR3/9601, from the U.K. Natural Environmental Research Council. We are grateful to Alan Blumberg for providing the original code for ECOMsi. Thanks are also due to Jiuxing Xing and Alan Davies for supplying the bathymetry and for useful discussions. Wind data for the seasonal model runs were provided by the U.K. Met Office, while solar data and air temperatures were courtesy of the Irish Meteorological Service. The satellite image in Fig. 3b was processed by the NERC Remote Sensing Data Analysis Service (RSDAS). We are grateful to Dr. Emma Young for comments on the draft manuscript and also to two referees for their very helpful suggestions.
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