- Campbell River
- Bayne Sound
- Cowichan Bay
- Sechelt/Irvine’s Landing
Having citizen scientists make oceanographic measurements in each of these areas, on the same day every 2-3 weeks between February and October, allows for complete coverage of the Strait of Georgia. The data collected will allow us to assess annual variation in the physical/chemical oceanography in the entire Salish Sea and to estimate phytoplankton biomass. These data will be very useful to modeling initiatives, and for understanding spatial and temporal changes in productivity of the Strait.
Ocean Networks Canada has developed a smart phone application for sample data transfer so that data can be sent directly from the small boats to ONC, where it undergoes quality control and is then archived and made freely available over the internet. ONC is responsible for project management, calibrations, engineering support, data management and QA/QC.
The main workhorse for the oceanographic measurements is a CTD (Conductivity, Temperature, Depth) instrument which collects and stores electronic measurements of the water properties. The instrument we are using, an RBR Concerto CTD measures these properties 6 times a second as it descends through the water column from surface to maximum depth. Attached to the CTD are two auxiliary instruments: a fluorometer which measures chlorophyll content and an optode which measures oxygen content. Fluorescence is an indicator of plankton productivity (algae growth), while oxygen is used both to trace the movement of water masses and to detect areas with low flush rates.
Along with the CTD profiles we take water samples for nutrients dissolved in the seawater – these samples are analysed back in the lab. Nutrients are used to identify water from certain sources (like rivers), to diagnose the limiting factors for growth of plankton and track the movement of water masses.
The third element is a small plankton net intended to capture zooplankton. This net is lowered to a maximum of 150m and brought up at a specified speed to capture plankton. A flowmeter in the mouth of the net will measure the volume of water that flowed through. Once back on board, the net is washed down with filtered seawater and the zooplankton collected from the cod end and preserved in formalin. Again these samples are returned to the lab for analysis of abundance and species found.
The fourth element is the use of a secchi disk which is used to asses water turbidity. The data collected from this part of our project will also be included as part of an international program to collect secchi disk measurements. A recent study of global phytoplankton abundance over the last century concluded that global phytoplankton concentrations have declined due to rising sea surface temperatures as a consequence of current climate change and prompted the development of an international effort to examine this www.secchidisk.org. Each of our citizen scientists has been provided with a tablet, and will download the free Android ‘Secchi’ application which will allow them to contribute these measurements.
The fifth is the collection of water samples to identify phytoplankton, as part of our examination of the spatial and temporal prevalence of harmful algae throughout the Strait of Georgia. Water samples containing phytoplankton are analyzed back at the lab and examined for harmful algal blooms.
Installation of sampling equipment is relatively simple, only requiring the installation of a mounting bracket for a small downrigger provided and installed at no cost. Approximately 3 feet by 5 feet of deck space is needed for instrument and equipment storage. This pilot project is the only one of its kind and thus brings opportunity for partnering with other citizens in the collection of oceanographic data.
The program was begun in February 2015, with all vessel operators fully trained to carry out the program on the first “shakedown” cruises. During 2015, the program had vessels outfitted and actively sampling the Strait of Georgia from Campbell River, Deep Bay, Qualicum, Ladysmith, Cowichan Bay, Victoria, Lund, Powell River, Sechelt and Steveston.
Ocean Networks Canada has provided a smart phone application for sample data transfer so that data can be transmitted directly to ONC, undergo QA/QC, archived and made freely available over the internet. For the first two months of the project, CTD data transfers from the instrument to the tablet and from tablet to ONC data centre created some problems, but initial issues were resolved by the ONC technical team.
In 2016 some changes were made to the program: the Victoria vessel was not continued as this area showed little seasonal variation oceanographically; instead it was replaced by a new vessel sampling out of Galiano Island. During 2016 we also implemented sampling for ocean acidity measurements on the Baynes Sound and Powell River vessels. This work was carried out in partnership with Wiley Evans of the Hakai Institute. PSF also supported a summer student in Dr. Rich Pawlowicz’s lab at UBC to analyse the CTD data.
Boats sampled the waters of the Strait of Georgia over 22 sample dates and collected the following information:
- 1,369 stations sampled
- 1,506 nutrient samples collected
- 1,958 phytoplankton samples collected
- 342 chlorophyll samples collected
- 2,689 Secchi recordings collected
- 60 zooplankton samples collected
The phytoplankton samples are 80% analyzed (by Svetlana Esenkulova, PSF), the zooplankton around 20% analyzed (at IOS), and the chlorophyll samples are fully analyzed (at IOS). The nutrient analysis is underway at the Mazumder Lab at UVic. Janet Lam, student at UBC, examined the data and provided constructive feedback to ONC for improving the sensors and data processing. These suggestions have been implemented by ONC. Changes and modifications were made during 2016 to the app used on all vessels. Data are currently being utilized by several of the other programs. The final year of collection will be in 2017: data analysis for all 3 years will be done over summer/fall 2017 by UBC. All data are available from the Strait of Georgia Data Centre.