September 8th – Today the Rosette sampler was deployed in Disko Bay to collect the first water samples at depth of the cruise. The sampler is equipped with CTD sensors that collect data for conductivity, temperature and depth although other parameters are also measured. The Rosette sampler also has a series of Niskin sampling bottles that are attached to a round frame and left open for collecting water for laboratory analysis on the boat. The sampler is lowered into the water via a cable and Niskin bottles are closed at various depths by scientists on board the ship creating a vertical profile for a suite of water quality variables (e.g., depth, conductivity, temperature, pH, chlorophyll, dissolved oxygen) from the seafloor to the surface. Once back on board, the data from the CTD and other sensors are downloaded to a computer system and the water sample in each Niskin bottle is collected and transported to the laboratory for on board analyses. Some water from each sample is saved for further analysis back on land at a later time.
While the Rosette sampler was deployed, Lisa Robbins watched the Arctic sunset from the ship.