Figure 13. Horizontal section of the interface between the CFG ice (at
left) of the bottom brick and the surrounding snow ice in which it was
embedded. Some recrystallization has taken place.
Figure 14. Typical sample of CFG ice showing equiaxed crystals and
small, uniformly distributed bubbles.
brick. Another thermocouple was centered on top of
profile of the mound. Figure 11 shows a plot of these
the brick and another brick placed on top of this. Each
temperature readings taken during the final two weeks
successive brick was installed with a thermocouple in
of the test period.
this manner. We then buried the stack with snow to
Heavy snows resulted in about 5 cm of water
minimize lateral thermal disturbance. Figure 10
flooding the ice. Figure 12 shows the stack of bricks
shows the completed mound with the umbilicus of
after it had been removed from the ice. The stack has
thermocouple leads and an embedded thermistor probe
been sliced vertically using a chain saw. The bottom
installed to confirm our readings. Because the readings
taken from the thermocouples were up to 6C higher
brick is embedded in newly formed snow ice because
of the flooding. Figure 13 shows a horizontal section
than those taken from the thermistor string, including
readings as high as +2.6 at the ice surface, we used
taken from the interface between the snow ice and
the CFG ice. There is clear evidence of some
the thermistor readings to determine the temperature
10
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