Modelling impact of bottom roughness on sea surface temperature in the Sea of Iroise

► We model impact of bottom roughness on sea surface temperature in the Sea of Iroise. ► Parameterisations integrate successively the seabed distribution and the wave. ► Numerical results are compared with field data and satellite images. ► Heterogeneous roughness distributions globally improve predictions. ► Effects are exhibited at the edge of Ushant front and nearshore exposed areas.