PLYMOUTH 2018

The work at the Saltash pontoon (50° 24’ 33.5’’N, 004° 12’20.0’’W) aimed to investigate temporal changes in water column on either side of high water to study the effects of tidal processes on the mid-estuary.

A Niskin bottle was deployed and fired every hour at the surface and 4m depth (in a total of 5m water at high tide) to collect and filter water samples for chlorophyll analysis using methods described by Strickland and Parsons (1972) [10]. Every half an hour, measurements of current speed and direction (using a current meter), irradiance (using a light meter with one probe on the surface and one in the water), as well as temperature, oxygen saturation, dissolved oxygen, salinity (using a multi-probe) were taken at every 1m increase in depth.

PONTOON

PONTOON

Figure 6 - Location of Saltash pontoon with relation to some of the lower estuary stations sampled by the Falcon Spirit.

[10]     Strickland, J. and Parsons,T. (1977). A practical handbook of seawater analysis. Ottawa: [Queen's Printer].