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Falmouth 2017 - Group 12 7TITLE

River

Discussion

Temp/sal

• Shows a negative correlation between temperature and salinity over the 4 stations in the river.
• Further up the river, it will be a lower salinity and the river was much shallower. The shallower river warms up quicker due to the smaller volume of water that the basin holds
•  Station N has the lowest salinity and the highest temperature while station Q has the highest salinity (closer to the mouth of the estuary) and the lowest temperature.

Sal/pH

• There is a positive correlation between the salinity and the pH of the river water. This could be due to the fresher water being more acidic than the alkali seawater. Therefore, as the salinity increases the pH will also increase.

Temp/pH

•  Temperature decreases with pH, however despite this it is not certain that the correlation is solely due to the parameters.

Describing physical data – Winnie the Pooh & Pontoon

Describing biological data – Winnie the Pooh

Physical

Biological

Phytoplankton  Estuary abundance:

Station N

Station N is extremely dominated by Nithcsia longissima with 70% of the phytoplankton found being of this species. Kerenia mikimotoi was the second most abundant with 16% of the total phytoplankton numbers. The species richness is 9 and the species evenness is 0.479.

Station O

Station O is highly dominated by Cilindrotheca closterium with 97% of the plankton abundance. The species richness is 5 and the species evenness is o.108. the total phytoplankton count is 233 individuals per millilitre.

Station P

Station P is largely dominated by Criptomonas spp with 91% of the abundance. The species richness is 6 and the species evenness is 0.226. The total phytoplankton count was 362 individuals per millilitre.

Station Q

Station Q is dominated by Criptomonas spp with 96% of the abundance. The species richness is 7 and species evenness is 0.215. The total phytoplankton count was 1602 individuals per millilitre.

Figure 1: Contour plot of temperature changes with depth and time measured with a multiprobe 07.07.2017 between 08:29 and 11:32 UTC at the location of lat xxx and lon xx.

Figure 2: Contour plot of chlorophyll changes with depth and time measured with a multiprobe 07.07.2017 between 08:29 and 11:32 UTC at the location of lat xxx and lon xx.

Description

Figure 1 shows vertical temperature contours in the beginning of the time series spreading more out and turning more horizontally around 10:00-11:00 UTC. In the end of the time series the contours in the surface layer are closing together and aligning diagonally.

Figure 2 shows an overall low chlorophyll concentration in the surface layer throughout the time series of measurements. Both around 10:00 and 11:00 UTC the chlorophyll shows a peak at 2 meters depth with a lower concentration at 3 meters. In the end of the time series the peak moves deeper to 3 meters.

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