DISCLAIMER: These opinions and views are those of the individuals concerned and not those of the University of Southampton.

TEMPORAL PONTOON SURVEY:

EXO-Sounder : Temperature depth profile  →

Results:

←  EXO-Sounder : Salinity depth profile

EXO-Sounder : pH depth profile  →

←   EXO-Sounder : Dissolved Oxygen depth profile

Flow Meter : Flow depth profile  →

←  Light Meter : Irradiance depth profile

Fluorometer : Fluorescence depth profile →

← Light utilised by photosynthesis (LUP) against        Chlorophyll

Total Chlorophyll against Oxygen Concentration →

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The results of the Exo-Sounder show that temperature (°C) decreases as depth increases, with a change of approximately 1°C observed over a depth range of 6m, and that temperature increases in the surface layers as time increased, e.g later in the day, with a change of 0.2°C observed in the surface waters across a period of 2.5 hours. The salinity data shows that salinity (PSU) increases as depth increases; the salinity decreased up to 1.3 PSU over a depth range of 6m. The pH data shows that pH has no correlation with depth, as the pH both increased and decreased at the same depths at different times of day. The dissolved oxygen data shows that organic dissolved oxygen (mg/L) decreases as depth increases, with a change of approximately 0.4 mg/L observed over 6 metres.

The results of the flow meter show that the flow (ms-1) increases as depth increases to a point (generally between 3-4m and a change of approximately 0.1ms-1, where the flow begins to decrease by up to 0.2ms-1.

The results of the light sensors show that light (LUP %) decreases exponentially as depth increases, with a decrease of up to 55% observed in the first 2 metres.

The results of the fluorescence data show that the chlorophyll concentration (µgL-1) behaved differently at different depths throughout the day. At some points, the concentration decreased as depth increased until a point, where the concentration sharply increases. At other points, the concentration increases as depth increases and at other points, the concentration increases as depth increases until a point, where the concentration decreases.

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