Summer has finally arrived in Nova Scotia, and we couldn’t have been more eager to get out from behind our desks again! This time we decided to take out the eosGP; so we bought a boat, the ‘SS Eosense’ – a very luxurious 2 person rubber dinghy.
Eosense is located in Burnside – an industrial park in Dartmouth, Nova Scotia. Nova Scotia is well known for its beautiful coastlines and abundance of fresh- and saltwater wetlands. Some call Dartmouth the City of Lakes, and we are lucky enough to have one in our own backyard: Spectacle Lake! It may not be the best lake to dive into on a hot summer day, but its unique wetland ecosystem made it the perfect place to take the eosGP out for a spin.
Spectacle Lake is smack dab in the middle of a large industrial park, which houses about 2,000 businesses and 30,000 employees. The lake is sheltered by the surrounding buildings making it quite stagnant with little or no wind. What makes the lake unique is that each side of the lake has a different ecosystem. The city of Halifax actually only considers the right side an actual lake and the left side is categorized as a bog/swamp, as shown below in Figure 3.
On one side you have deep and cold water. The other side is shallow (1/4 meter deep), and a lot warmer. We anticipated there would be a difference in concentration based on the very different appearance, so we took out the eosGP to compare the carbon dioxide (CO2) concentration on each side.
The eosGP is the adventurer of our greenhouse gas monitoring instruments. It provides continuous and accurate in-situ monitoring in aquatic or terrestrial ecosystems. It’s compact size allows for easy and quick deployment! We simply attached it to a battery and a volt meter and we were on our way. We let the eosGP float along beside us as we took measurements around the lake to keep equilibration time down.
Given the difference in appearance of both sides of the lake it was not surprising that the CO2 concentrations would also fluctuate. The left side had significantly higher CO2 concentration than the right. The left side, or the swamp side, had very shallow warm water, had a floor covered in moss and a layer of lily pads covering the surface. The swamp side also had a lot of fish and amphibians swimming around and a lot of biological activity. Once we moved to the right side of the lake which was deeper and colder there was a drastic drop in CO2 concentration. The right side of the lake had significantly less vegetation and biological activity. It was very interesting to see one body of water with two different stories. We were very lucky to find this lake in our backyard as it is a perfect example on how diverse ecology actually is!
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