22 March, 2002
The Science Behind Sun Cups
Before we proceed with this new topic, recall thermal conductivity changes from yesterday's journal. Variations in thermal conductivity depend on changes of snow density, which can be affected by warmer temperatures and flooding.
As far as snow cover on Jalpertia pond, snow depth and surface textures are two evident changes. Due to warmer temperatures and gust winds, snow depth decreases and surface textures present more detail and deviation.
With more than 12 hours of daylight, sun cups (cup-like grooves) will extend snow surface area especially near dark-colored vegetation -- excellent solar radiant material. Often times, air gaps are found
near vegetation (see Picture #6.)
For homework tomorrow, we will have a quiz on native trees. Study the identification chart (March 19th journal.)
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