The highlight of the Glacier Bay cruise was the chance to view the calving of the glacier. Calving describes the breaking apart of pieces of ice from the face of the glacier. This happens regularly and more frequently now that there is global warming. If calving takes place faster than the buildup then the glacier would be retreating. We were very fortunate to be able to watch this process at quite close range. Before the ice pieces break away you can hear a loud sounds like the distant firing of a gun or firecrackers. Small pieces usually at the bottom first break away, fall into the water, making splashes. Once the bottom is weaken a big piece from the top would fall causing a big splash. The disturbing of the water caused by the faling of the big pieces of ice from glacier can be dangerous to small vessels stationed too close to the disturbance.
In the beginning small pieces fell from different places on the glaciers face. The show was over by the time you look at that direction. Then 2 instances of calving (with reasonably big pieces falling off) took place at the spot right in front of where we were watching.
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Small pieces falling off at the bottom
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Bigger piece starting to fall
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Another big piece starting to fall
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Same big piece falling lower
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Alas, the Captain decided that we had enough after we watch the 2nd big piece calve and sailed away
Click below to see a slideshow of the series of pictures taken (in burst mode) of one of the ice pieces calving
http://www.flickr.com/photos/64206086@N04/sets/72157627080005808/show/
Below is the link to a slide show of the impact of falling ice pieces into the water
http://www.flickr.com/photos/64206086@N04/sets/72157626992371199/show/
Did not take any videos but bought the video taken by the ship which documented the 2 instances of calving. Unfortunately cannot post the video as it is copyright. If you do a search of glacier calving you will come across many videos posted by others on Youtube.