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