CTD and the Rosette samples on Lake Superior

spotSpotlight On: The CTD and the Rosette samplers - these instruments are the workhorses of the Lake Guardian arsenal. CTD stands for conductivity - temperature - depth, but the modern version of this instrument includes probes that measure pH, oxygen, chlorophyll, turbidity and other parameters. The CTD is attached to a cable and is lowered to the bottom generating real-time and archived depth profiles of physical, chemical and biological conditions. Mounted above the CTD is a circle of water bottles called the rosette sampler. The bottles are set to trip at specified depths, collecting water for later analysis. If something interesting shows up on the CTD, the operator can trip a bottle to collect an extra sample.

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Rosette collects water samples at various levels for chemical analysis, data sheet shows the descent and when bottles open to collect sample at a specific depth

Rosette top detail

Rosette top detail

First Station rosette, showing the researcher collecting the water samples from the rosette bottles; Rosette collects water samples at various levels for chemical analysis, data sheet shows the descent and when bottles open to collect sample at a specific depth.

 

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rosette view with cab

Operators cab for rosette in upper left

Rosette cab window with bottle opening depths

Rosette cab window with bottle opening depths

 

Rosette collects water samples

Rosette collects water samples at various levels for chemical analysis, data sheet shows the descent and when bottles open to collect sample at a specific depth

 

Device on bottom part of rosette displays water data, such as temperature, density

 

Device on bottom part of rosette displays water data, such as temperature, density.

CTD Device on bottom part of rosette displays water data, such as temperature, density.

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Civil & Environmental Engineering Department at Michigan Tech