Hourly rates of seabed temperature change at the time-series site in study area A.

Observations were made at intervals ranging from 0.93 to 1.32 hr over a 12.22-hr period. They extended from 0.43 hr before (−) high tide (Hi) to 0.50 hr before (−) high tide and encompassed both flood (F) and ebb (E) stages. Rates of temperature change (oC hr−1) were calculated using differences in seabed temperature (ΔT) and the time elapsed from the previous observation. Rates were highest at or just after mid-ebb tide (CTD sta 059, −2.48oC hr−1; CTD sta 060, −1.83oC hr−1) and just before mid-flood tide (CTD sta 070, 1.14oC hr−1). Maximum flood and ebb rates of temperature change used for Area A in Table 3 are shown in bold type here. No data were collected at the exact times of high or mid-flood tides, although both were bracketed. Low rates of temperature change bracketed low tide (slack water; CTD sta 061, 066, 069). Temperature decreased during ebb tide (CTD sta 057-061) and increased during flood tide (CTD sta 069-073). See Figure 8 for temperature cross-section at the site.