Comparison of parts of seabed transects along which temperature is affected or not affected by the tidal front at high and low tide.

Seabed temperature change per kilometer is given for parts of transects where individual sites are affected or not affected by the tidal front. By our definition, a site is affected by frontal movement if the temperature change between high and low tides is >1°C (Table S1, H-L ΔT). For example, in study area A at high tide, the part of transect T16 affected by the front extended over a distance of 17.1 km. Temperature changed from a minimum of 9.8°C (in the deep part) to a maximum of 13.6°C (in the shallow part) over that distance. Thus at high tide, temperature changed 3.8°C over 17.1 km and the rate of change was 0.22°C km−1. In area D, all stations along transect 23 were affected by frontal movement. See Figure 7 for locations of stations along CTD transects. Table S2 contains additional data.