Falmouth Group 8

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Station 5

The trend here is noticeably different from that of the other stations. The overall range is 3.90-4.10, with the same range at specific depths as station 4 displayed. The average value of 3.93 remains reasonably consistent down to 8 m, where from then on there is a general linear increase up to 4.09 at 15 m depth.

Transmissivity-Figure 3

Salinity stays constant in the first 2m, 33.4 and then decreases between 3 and 6mto 33.2. After 6mthere is an increase in salinity from 33.2 at 6mto 34.2 at 13m, the water column at station 5 shows an overall increase in salinity of 0.8.

Silicon concentration increases in the surface water from 5.67µmol/L at 1.2m to 7.029µmol/L at 2.67m. The silicon concentration then rapidly decreases from 7.029µmol/L at 2.67m to 3.63µmol/L at 13m.

There is a continued decrease in phosphate concentration from 0.0019µmol/L at 1.4m to 0.0011µmol/L at 13.0m. The greatest rate of decrease occurs between 1.4m and 5.8m decreasing at a rate of 1.5x10-4µmol/L per meter.

Nitrate concentration follows a similar trend shown by phosphate, decreasing at the greatest rate between 1.4m and 5.8m. The overall decrease in nitrate concentration in the water column is 1.6µmol/L.  

All major changes in nutrient concentrations occur above the 1% irradiance depth.

Nutrients-Figure 2

Fluorescence-Figure 1

Error Range: 0.488-0.432 = 0.056

Average fluorescence increases rapidly in the first meter from 0.362 at 0.18m to 0.427 at 1.2m. Fluorescence continuous to increase steadily to 6m where the average is 0.466 from here the fluorescence starts to decrease. The average fluorescence between 6m and 14.7m decreases from 0.466 to 0.437. It is interesting to note that there is a cluster of data points on the left hand side of the graph between 6 and 10 meters. There is one anomalous data plot at 2.67m where the fluorescence is 0.671. There are several erroneous data points shown by the graph the most obvious at 9.33m where the fluorescence is 0.603.

ADCP Transect-Figures 4,5&6

ADCP readings here show evidence of a stratified flow occurring at around 8 m depth.

Down to approximately 5 m the current was moving outward in a westerly direction at down to -0.5 m/s (east velocity). From the ship track the results show that between 5-10 m depth the current flow here exhibited more random movement.

Click graphs to enlarge

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