First Water Sampling Station – What is a Rosette?

The Healy arrived at the first water sampling station in the Arctic Ocean. The scientific team used a device at the first station called a rosette that can take multiple water samples and measurements at once. The rosette sampler is a set of 24 sampling bottles called Niskin bottles. These bottles are connected to a frame that is lowered to the seafloor from the ship by a cable. The bottles remain open at the top and the bottom while being lowered to the desired depth beneath the sea surface. Each bottle can be automatically triggered to close and capture a water sample at the desired water depth. Typically, one bottle is closed near the bottom, then the remaining bottles are closed one at a time on the way back up to the surface to create a vertical profile of water samples from the seafloor to the surface of the water. Once the rosette returns to the surface, it is placed on the ship so the scientists can collect the water from the bottles and preserve it for chemical analyses. The pictures below show a rosette of 24 Niskin bottles after it has returned to the surface after collecting vertical profile samples.

The rosette is lifted from the water:

Rosette is lifted from the water.

The rosette is lifted from the water.


Data from the water sampling is seen on a computer.

The computer shows the depth progress of the rosette and ctd.




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