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Tim Hollibaugh shows the difference in a sample taken
in surface water compared to one taken at the fluorescence maximum
at 17 meters (see figure).
Look carefully – the bottle on the left (surface) is clear while
the bottle on the right has a greenish tinge from millions of tiny
plants (the "Mickey Mouse" organism, Picocystis).
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| Erin Biers prepares to collect water samples from a
Niskin Bottle. This device uses a spring-loaded trigger to close the
end caps and collect water from a specific depth in the lake. A weighted
"messenger" is sent down the hydrographic wire to "fire"
the bottle after a short rinsing time. |
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Gary Lecleir demonstrates how a remotely triggered sampling
bottle works. This model, called a Van Dorn bottle, is triggered by
a weight that slides down the rope used to lower the bottle. When
triggered, the plugs at the ends are pulled together by a spring,
closing the bottle and capturing the enclosed volume (2 liters). |
| Tim Hollibaugh demonstrates the profiling instrument
used to collect the data shown in the figure. For you technophiles,
the basic unit is a standard shallow water SeaBird SBE 19 CTD with
a SeaTech fluorometer and a LiCor 2p PAR sensor. A special conductivity
sensor has to be used in Mono Lake’s high salinity environment. |
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Tim Hollibaugh demonstrates a special device
made for sampling thin layers of plankton ("plates") in
Mono Lake that form at the interfaces between water layers. The hose
attached to the top is connected to a peristaltic pump. Hollibaugh
is pointing to a slot that water is drawn through the when the pump
is running.
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| Dr. Sally MacIntyre demonstrates the operation of an
"acoustic Doppler current profiler" (ADCP), used to map
currents in Mono Lake. This device sends out sonar beams in 3 directions
and uses the differences in the signals to map the vertical distribution
of currents in the lake. |
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Boston whaler, crew, samples, and gear returning from
a successful sampling mission. |
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