Aside from the irradiance profile, which showed a familiar exponentially-decreasing measurement with increasing depth, all of the CTD-measured parameters for site C5 show the greatest change between 10 and 20 m depth. The considerable, rapid temperature decrease of about 0.5(UNITS) at 17m indicates the presence of a thermocline separating the well mixed water column above from the stratified waters below. The fluorescence and CDOM readings increased at the thermocline and while the CDOM stabilized at 0.04, fluorescence increased to an average value near 0.11 mg/m3.

Nitrite concentrations at C5 remained very low around 0.0µmol/L and remained at a constant concentration throughout the water column. Silicate, phosphate and fluorescence showed a generally increasing trend with depth from 15 to 20 m depth with a peak at 20m. Nitrate decreased from the surface until 15 m indicating that it is being removed, probably due to a phytoplankton bloom or by primary producers in the photic zone. The large peak in fluorescence levels at 20 m suggests that there is a deep chlorophyll maximum at this depth which could explain the corresponding nutrient peaks.

C5