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  • There we go!

  • Finally!

  • I have to admit when I'm out on the glacier and we're carrying all the gear

  • and we're at high elevation and you're working really hard

  • I definitely ask myself whether I really want to be doing this

  • But you look at the scenery and

  • there's really no other place that I would rather be at that moment

  • The logistical issues with monitoring these glaciers are about the toughest part

  • of this

  • Getting to them safely and back safely

  • requires an awful lot of work and so we depend on having

  • staff at Mount Rainier and at North Cascades.

  • There are several reasons we monitor these glaciers

  • They're habitat for certain species and they're part of the alpine food web

  • They're a tremendous indicator of climate change. But probably the most important

  • reason we monitor them is because of the water

  • These glaciers provide a substantial amount of water during the summer

  • that fuels the hydroelectric industry in the North Cascades.

  • The glaciers are also providing a

  • considerable amount of meltwater to our rivers and lakes

  • and so they provide what we call buffering capacity

  • in the summer when we get very little rain these

  • glaciers continue to provide water and buffer our lakes and streams from the

  • summer drought or droughts over a longer period. So we're connected to the lake and

  • the aquatic monitoring as well as providing this overall

  • weather and climate information.

  • So in the spring when we come out and we are placing the ablation stakes, we

  • rely on this steam drill. Which, the inside is basically like a camping stove

  • We have a propane tank. We fill it with water. We heat up the water and it

  • produces steam

  • You know the pressure builds inside. We release the pressure and then we have a

  • 13 meter hose

  • that the steam comes out of that we drill directly into the glacier.

  • We drill 13 meters and we place the ablation stake down in the glacier

  • And then we can come back and watch it melt off that stake.

  • We monitor glaciers by visiting them at least twice a year. And the idea is that

  • we want to measure how much snow the glaciers accumulate

  • on their surface in the winter and then by melting stakes into the glacier in

  • the spring

  • we can monitor how much of that snow and ice beneath it melts through the summer.

  • Our observations have indicated that the glaciers in the North

  • Cascades have

  • decreased about 50 percent in area in the last century or so.

  • So we've been studying the two glaciers

  • Nisqually and Emmons at Rainier since 2002 and every year there's been a net loss

  • I think it's been about one to two meters of water equivalent lost

  • throughout the whole glacier. Which ends up being billions of gallons

  • of water

  • If the public could actually see the measurements that we are seeing

  • And see the glacier and how it changes every year and the amount that sometimes looks like

  • it's falling apart or the snow field looks like it's actually rotting

  • It just becomes much more real, the impact that climate change could have.

  • Monitoring glaciers is important because they're giving us a

  • really dramatic measure of the climate change and the global disruption that we're seeing

  • in climate right now

  • That has been really important for

  • for reaching the public and helping them understand this global

  • climate change that's occurring

There we go!

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B2 中高級

測量冰川 (Measuring Glaciers)

  • 402 31
    QAM Chen 發佈於 2021 年 01 月 14 日
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