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Estuarine-
Pontoon
At the pontoon, a CTD was lowered through the water column every 30 minutes with
measurements taken every metre. Water depth was measured over the course of the day
to see the effects of the tides.
The horizontal Niskin bottle was used to take two
samples per hour (surface and max depth). 50ml of sample filtered to collect chlorophyll
for analysis.
To determine attenuation with depth a PAR light sensor was used. This
was compared with readings taken from a surface sensor to compare against cloud cover.
A direction fish lowered into water once per hour to collect information on flow
velocity and direction.
Contour Plots
Three contour plots were plotted to show the time series data for temperature, salinity and chlorophyll on the Pontoon on 10/07/17. The variables were measured every 30 minutes thus the values plotted in between were interpolated and may not be necessarily representative of the true data. In all profiles the tidal state is clear on the depth axis, showing low water at approximately 12:00 UTC which provides reasoning for the gradual changes in colour during low water.
The salinity and the temperature plot can be compared and related to density. During low water, temperature increases from ~16.5°C to ~18.5°C as depth decreases and the water column becomes shallower forming a thinner water mass. As a result, the water mass is more rapidly warmed decreasing the salinity and density of the water column. In contrast, during high water, water temperature is significantly lower throughout the water column and salinity is higher (34.4) due to a thicker water mass.
The chlorophyll plot also shows a similar pattern to the temperature and salinity plots showing higher values during low water as a result of higher temperatures and lower values during high water as temperature decreases.
Figure1: Temperature contour plot
Figure2: Salinity contour plot
Figure 3: Chlorophyll contour plot
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