The Anatomy of a Glacier

Cerro Torre Looms Over Glaciar Grande

Above, you can see Cerre Torre, a new mountain created in the last ice age, with Glacier Grande at its foot. The lake providing the reflection has been created by the ice sheet’s melting waters, and formerly was the bed of the glacier in previous eras.

Walking on a glacier can change your view of water (don’t forget to sign up for the Live Earth Dow Run for Water). An important fresh water reserve, the Southern Patagonia Ice Field is the second largest extrapolar ice field in the world, and has been dubbed a global resource by UNESCO. While touring the glaciers of Patagonia last month, I did such a walk, and received an education on these shrinking resources.

Cerro Torre Looms Over Glaciar Grande

When you see a glacier in its various stages moving towards the inevitable lake that awaits its melting waters, you are stunned (In the picture above, you can see me about to walk Glacier Grande’s ablation zone). I literally sat, watching several glaciers, poised for the crack of ice and the calving of their walls as they fell into the water.

The part most people see is the ablation zone, where net loss occurs. It’s in this area that you watch the ice flows falling or floating away from the glacier. It is also where you can see the greatest effects of global warming.

Glacial Melt.jpg

In the above picture of Glacier Grande, you’ll see several notations that highlight the glacier’s melting process over the past 25 years:

  • The section marked A represents the current glacier wall, 30 meters above the water surface.
  • B is a granite formation uncovered by the glacier, which is more than 40 meters high in points. This is also where the glacier wall was located approximately ten years ago.
  • With C we see where the glacier wall was 25 years ago. Global warming has had a significant impact on Glacier Grande.
  • D shows you sediment lines, depicting how high the glacier has been in past eras.
  • The ice floes depicted by E where originally part of the wall (A), and have calved. These mini icebergs were caught by the granite formation and eventually either melt or make their way into the larger lake.
  • F represents the larger ablation zone.
  • 4272981186_af0f7c4dc9_m.jpgIf you participate in a glacier walk you can see incredible ravines caused by glacial melt, shrinking and growing. The fracture zone occurs right before the mouth of the glacier where melting occurs. The constant creeking, the deep ravines, the imminent danger, and the fact that the valley you are walking in was carved out by an older form of the very same glacier reminds you of the great power water posesses.

    Walking a glacier can be a surreal experience, but can also be quite dangerous. In some cases the water moves in torrents, and carves massive falls and dangerous ice caves.

    Make sure you hire a guide who can show you how to do it using crampons, picks, and other equipment. In our case, we had three tour guides who helped ten of us. Believe me, we needed them. There were several dangerous bridges that could have yielded a 45-50 meter drop into the freezing lake water under the glacier.

    Glaciar Grande

    Geoff Livingston is a regular contributor to the Live Earth blog.

Five Ways to Reduce Your Carbon Footprint

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It’s one thing to acknowledge the climate change crisis, it’s another to actually change behavior. So here are some simple ways that I have changed to reduce my personal carbon footprint.

1) Eat less meat: One quarter of greenhouse gas emission have been created by the livestock industry. It takes many, many times the amount of grain to create that one pound of beef or chicken, than one pound of vegetarian food. While I like a great steak still, I have committed to eating vegetarian every other day, and trying to eat meat only once on the days that I do partake.

2) Buy a hybrid: It’s important to pay a little extra to support new environmentally savvy technologies. I did, albeit a Toyota Highlander Hybrid, and it’s 28 MPG local far surpasses the 20 MPG I was getting in my Acura TL. Further my Ducati gets 52 MPG, and is my preferred “off hours” vehicle of choice.

3) Metal or plastic canteen: I’ve got three metal ones now. Carrying filtered water instead of buying plastic bottles represents a significant reduction in greenhouse gas. Americans consume so much bottled water that one could compare it to an additional 500,000 cars on the road.

4) Weatherize your house: Homes are responsible for 21% of greenhouse gases in the United States, so this is a big one. We actually bought a weatherized home right before we got married four plus years ago. Even with high gas prices, the house still rarely sees a heating or electric (AC) bill greater than $100.

5) Shut down your computer at night: If you are a blogger like me, it’s easy to leave your computer on. That way you don’t have to boot up in the morning, right? But you are hurting the environment for those precious two minutes of time. According to MIT, “the surge of power when a computer is turned off lasts a few seconds and is insignifcant compared to the sustained energy used in keeping it on during periods of inactivity.” Admittedly, I forget to do this, but mindful power consumption (including light usage) is a continuing effort in our house.

What would you add to the list?