Falmouth Group 8

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Depth (m)

5.1

Salinity

35.2

Phosphate Concentration (µmol/L)

0.170

Dissolved Silicon Concentration (µmol/L)

2.450

Nitrate Concentration (µmol/L)

4.570

Chlorophyll Concentration (µg/L)

3.46

Oxygen Sat.

101.4 %

Station 5





Time: 13:03 (UTC)


Lat: 50 12.508N


Long: 004 47.911


Wind: 342° 15.6 knots


Cloud: 8/8




Click graphs to enlarge

At station 5 the chlorophyll concentration at 5.1m is higher compared to station 6, which is 1.17 µg/L. The nitrate measurement at 5.1m is low compared to station 6 at 5.6m, which is 12.97 µmol/L. The phosphate and silicon  concentration is higher at station 5 than at station 6 at 5.6m. The oxygen saturation is lower than at station 6, which has a saturation of 114.4%. All other nutrient and dissolved oxygen samples at the other stations were taken at dissimilar depths so it is not suitable for comparison.

Station 5 has a higher chlorophyll, dissolved silicon and phosphate concentration and oxygen saturation than stations 1 to 3, if compared to measurements between 1 and 2 meters. The nitrate concentration at station 3 at depth 1.5m is significantly higher than any of the other stations, with a value of 39.66µmol/L.


Nutrients, Chlorophyll and  Dissolved Oxygen - Table

The profiles for all the variables measured are relatively more stable and show little change with depth, although the depth range sampled here is much smaller. Fluorescence only displays a slight linear reduction with depth, whilst temperature remains at a similar value throughout. Irradiance levels and salinity display a very similar trend as to all the previous station readings.

Within the depth range sampled, the trend in all profiles demonstrates characteristic mixed waters. The lack of a thermocline here has contributed to the provision of optimal conditions for phytoplankton throughout the water column.




CTD - Figure 3

Backscatter: A high return of backscatter visible from surface to 15m with areas of low return beneath.

Velocity and direction: The flow is fairly uniformly East, Southeast with speeds of  0.4 m s-1, decreasing with depth to the bottom.

ADCP - Figure 1 & 2

The station 5 measurements can only be compared to the station 6 measurements at 5.6m.