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Transcript of Illecillewaet Glacier
What factors could contribute to a glacier advancing instead of retreating?
Why a Glacier Advances
The factors that could contribute to a glacier advancing instead of retreating are ice ages and temperature drops. When an ice age occurs, lots of snow falls which would help a glacier advance because the Earths temperature drops which makes the snow that falls freeze and add onto glaciers. When the Earths temperature drops below freezing, precipitation falls as snow instead of rain and when snow builds up over time it causes glaciers to advance. If the temperature doesn't rise again or the ice age doesn't end it will cause the glacier to advance. If the Earths temperature rises it will cause the glaciers to retreat and shrink in size.
As a glacier retreats, what will happen to the volume of melting water that a mountainous region normally receives? How will this affect the mountain streams and rivers downstream?
As a glacier retreats, the volume of melting water that a mountainous region normally receives will increase rapidly which will cause floods and mountain tsunamis. This will affect the mountain streams and rivers downstream by causing the rivers and streams to overflow because activities that are caused upstream always have an effect downstream. By this we mean that if you pollute the streams upstream by throwing garbage in the water it will have an effect downstream because since water always travels downstream because of gravity the garbage will show up downstream and will cause pollution there too. Also, if a glacier retreats that means that certain animals will sadly lose their homes. For example, polar bears will no longer have places to sleep and live because they live on glaciers and if glaciers are melting that means that their habitat is being destroyed. Not only are they losing their habitat, but they are also being exposed to starvation. The reason for this is because polar bears mostly feed on seals, walruses etc. which are also disappearing with the change of the climate.
For each glacier, calculate how much its terminus has changed in that time.
Terminus Position vs. Time
For glacier A, the terminus position has changed a lot over the years and is a decreasing trend because first the glacier was at about 50m and it kept on decreasing until it got to about -1300 in 1957. Then it increased a little and went back down in 1995, but most of the time the trend was a decreasing trend which means that the glacier is retreating. For glacier B the terminus position also has an decreasing trend, but it is a more steady trend then glacier A because the glacier is not retreating as quickly as glacier A is. The glacier has a decreasing trend because first the glacier was at about 5m in 1895 and it kept on decreasing until it got to about -1050 in 1992. It then increased a little after 1992 which could mean that the glacier may start to advance again.
By how much has the front edge of the glacier that you researched changed in the past century?
The Illecillewaet Glacier has been receding over the past century. The glacier has retreated 2km since 1886, which is when the Illecillewaet glacier was first founded, this is a decrease of 1.6%. The glacier has an area of 2.97km, its mean depth is estimated to be 100m and its highest point is 2800m high. However, since 1972 the Illecillewaet glacier has advanced about 100m. The park Naturalist Service implemented field measurements from fixed points, which continues to the present. They measured a total re-advance of 91.75m from 1972 to 1984. The Illecillewaet glacier has an average retreat of 31m at the toe or terminus from 2000 to 2011. As you can see in the 3D picture the glacier has retreated significantly. You can't really see the 3D effect, but in 1887 the glacier was so much bigger then 1931 because the glacier has been retreating because of global warming.
By: Kiranjit Sahota and Panveer Dhaliwal
The Illecillewaet glacier is located in Glacier National Park in British Columbia, Canada. The name Illecillewaet came from an Okanagan Nation which means "Rushing Water". Scientist started measuring the Illecillewaet Glacier after the Vaux Family, the world first glaciologists, started taking pictures of it every year since 1887. They would go there every year to monitor the glacier because they had noticed that every time they had taken pictures they could see that the glacier was shrinking. Their tradition is still going on with other glaciologists that are measuring the Illecillewaet glacier. Anyways, sit back and relax while we start our presentation on the Illecillewaet Glacier.
Well that ladies and gentlemen is the end of our presentation. We hope you enjoyed listening to us talk about the wonderful Illecillewaet glacier. We certainly had a good time talking about it. In conclusion, we would just like to say that the Illecillewaet glacier is an amazing tourist attraction and is also the most visited glacier in Glacier National Park. We most definitely recommend you to go there for an experience of a life time.
Jokes About Glaciers
Q: How do you spot a glacier?
A: You need good ice sight :)