"Alpine" pond
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"Alpine" pond |
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| One of the ponds we studied was
high on the flank of the big ridge and did not appear to be
in direct contact with the ocean. The water level in this pond waxed and
waned throughout the melt season. To observe these changes, we strung a
reference line across the pond and periodically measured the water
depth and the distance to the ice bottom. Measurement uncertainties were mainly
due to the string sagging, giving errors of 2-3 cm in height. Fortunately
we can correct for these errors since we know that the surface of the pond
is flat. The results of these
measurements are shown in the animation below. The gray shaded area is
ice, the blue is water, and the light blue is snow. The overall ice melt
is shown, along with changes in pond depth. By 26 August the pond surface
was frozen and snow began to accumulate. There is also an
animation for the evolution of a pond at Seattle.
There is also a photo showing this pond and its
neighors.
Press Stop button on browser to end animation.
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| Selected profiles from the "alpine" pond. |
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