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![]() Andrew
Fountain '75
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Glaciers and the near future of global sea level changeThe
glaciers of the American West, exclusive of Alaska, were unknown to
science until the late 1800s when the first of the four geological
surveys identified a glacier in California for the first time.
Soon after that 'discoveries' of other glaciers rapidly followed.
The glaciers were a curiosity until the end of the century when
scientists, primarily geologists took a more professional interest in
their activity and processes. In the 1920-30s hikes to glaciers
became a particularly popular activity and coincided with their rapid
recession following the Little Ice Age. A number of hiking clubs,
often in collaboration with scientists, assumed responsibility for
monitoring the rate of glacier retreat. It was not recognized at
the time, but these shrinking glaciers contributed to rising sea
level. Indeed, alpine glaciers and ice caps are the dominant
source of new water to the ocean and largely account for about
one-third of current global sea level rise. Although the glaciers
are small, in comparison to the two great ice sheets, they are losing
mass rapidly and will account for the majority of new water added to
the oceans through the rest of this century. Of the two ice
sheets, apparently Greenland is starting to make substantial
contributions and Antarctica may be under way soon. Predictions
suggest about a one meter sea level rise by 2100.
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| Last Updated:
September 23, 2010 |
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Sarah McElfresh
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