Submersible temperature loggers (Tidbit, Onset Computer Corporation,
Bourne MA) were used to measure bottom temperature at nine coastal
reef and two island sites in the Santa Barbara Channel, CA. These
temperature loggers measure temperature in water within a range of
-20°C to 30°C, and accuracy of ± 0.20 °C at 25°C.
Two temperature loggers were deployed at each site at a depth of
approximately 7 m (MLLW), and fastened to permanent rebar stakes on
the seafloor with two cable ties. Each logger was programmed to record
ambient temperature every 30 minutes. The programming of the two
Loggers at a site were offset by 15 minutes so that the final record
shows a temperature measurement every 15 minutes. Temperature loggers
were retrieved and replaced bi-annually with a new logger, typically
in the early summer (June-July) and in early winter (January-March).