Dynamic Planet B/C Question Marathon

Test your knowledge of various Science Olympiad events
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PacificGoldenPlover
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Re: Dynamic Planet B/C Question Marathon

Postby PacificGoldenPlover » Mon Sep 09, 2013 12:07 am

Just putting it out there, surges do NOT occur due to sudden accumulation. It would require a ridiculously large amount of snow dropped over a huge surface area. Surges happen due to greatly enhanced basal slip, and relative to the glacier thickness, there really is no situation where basal water pressure could be that much affected simply by accumulation.

In addition, mass accumulation does not explain why the vast majority of surges are cyclical.
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Re: Dynamic Planet B/C Question Marathon

Postby Crazy Puny Man » Tue Sep 10, 2013 3:35 am

Not even through avalanches or landslides? Sure, not too much cyclical, but not even possible?

They also occur due to bedrock failure/sudden slippage...which, to my understanding, is caused by an accumulation of stress in the glacier which can can result from slow-moving ice at the terminus 'damming' up faster-moving ice up-glacier, and the glacier surges once the stress goes beyond a certain 'critical point.'

Could that also (somewhat) explain the cyclical nature of surges too? In certain cases?

EDIT: what is your source(s) for this information? and in general too, if you wouldn't mind sharing xD

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Re: Dynamic Planet B/C Question Marathon

Postby PacificGoldenPlover » Tue Sep 10, 2013 2:55 pm

Crazy Puny Man wrote:Not even through avalanches or landslides? Sure, not too much cyclical, but not even possible?

They also occur due to bedrock failure/sudden slippage...which, to my understanding, is caused by an accumulation of stress in the glacier which can can result from slow-moving ice at the terminus 'damming' up faster-moving ice up-glacier, and the glacier surges once the stress goes beyond a certain 'critical point.'

Could that also (somewhat) explain the cyclical nature of surges too? In certain cases?

EDIT: what is your source(s) for this information? and in general too, if you wouldn't mind sharing xD

Well, for instance, glaciers are fairly picky as to whether or not they will surge. If a glacier is a nonsurging glacier, then it will almost certainly not surge even if a lot of snow is placed on top of it.

Glaciers surge because stress causes a positive feedback cycle where channels in the ice collapse, forcing the meltwater to travel to the base of the glacier, essentially lifting the glacier up. So, if immediately a after a surge an avalanche fell on a glacier, the glacier would not surge because it needs time for these channels to reform.

It's kind of a chicken-and-egg question. I see where you are coming from, but I still say location, history, and the state of englacial meltwater are all much better determiners for whether or not a glacier will surge.
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Re: Dynamic Planet B/C Question Marathon

Postby Crazy Puny Man » Thu Sep 12, 2013 12:14 am

PacificGoldenPlover wrote:
Crazy Puny Man wrote:Not even through avalanches or landslides? Sure, not too much cyclical, but not even possible?

They also occur due to bedrock failure/sudden slippage...which, to my understanding, is caused by an accumulation of stress in the glacier which can can result from slow-moving ice at the terminus 'damming' up faster-moving ice up-glacier, and the glacier surges once the stress goes beyond a certain 'critical point.'

Could that also (somewhat) explain the cyclical nature of surges too? In certain cases?

EDIT: what is your source(s) for this information? and in general too, if you wouldn't mind sharing xD

Well, for instance, glaciers are fairly picky as to whether or not they will surge. If a glacier is a nonsurging glacier, then it will almost certainly not surge even if a lot of snow is placed on top of it.

Glaciers surge because stress causes a positive feedback cycle where channels in the ice collapse, forcing the meltwater to travel to the base of the glacier, essentially lifting the glacier up. So, if immediately a after a surge an avalanche fell on a glacier, the glacier would not surge because it needs time for these channels to reform.

It's kind of a chicken-and-egg question. I see where you are coming from, but I still say location, history, and the state of englacial meltwater are all much better determiners for whether or not a glacier will surge.


Um...I'm not sure I follow you >_> The channels are in the middle of the glacier, i.e. not at the base, right? Also, wouldn't the meltwater travel to the base through moulins? Moulins are how supraglacial meltwater gets down to the base...

Are you saying that the meltwater, instead of traveling through tunnels in the ice, percolate/leak through the glacier and travel to the base? Or that the added stress simply increases pressure & therefore lowers the ice's melting point?

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Re: Dynamic Planet B/C Question Marathon

Postby PacificGoldenPlover » Thu Sep 12, 2013 12:59 am

I will respond on the regular dp thread.

EDIT: Since it has been a while since anyone has posted any questions, I'll post one:

What is the largest nonpolar, non icecap glacier in the world? Which countries is it located in? What is its geopolitical importance, and how is this importance accelerating its retreat?
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Re: Dynamic Planet B/C Question Marathon

Postby BYHscioly » Fri Sep 13, 2013 1:58 am

It's the Siachen glacier, located somewhere in the Kashmir region (India/Pakistan/China). It's important since it's one of the sites of territorial conflict between India and Pakistan, and the conflict - the heat and stuff generated from the military operations - sped up its retreat to 110 meters a year as of now.

What are D-O events, how are they caused, what are they like, and how do they effect the cryosphere?
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Re: Dynamic Planet B/C Question Marathon

Postby PacificGoldenPlover » Fri Sep 13, 2013 3:54 am

Not sure I know the answer to all the parts. Here goes:

D-O stands for Dansgaard-Oeschger event. It is the phenomenon where global temperatures rapidly warm following a glacial period. I would assume they are a byproduct of the Milankovitch Cycle, but not positive what specifically about them causes it. As said before, they lead to massive warming, thus rapid retreat of glaciers, ice sheets after a glacial maximum.

Belated affirmative to my previous question.
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Re: Dynamic Planet B/C Question Marathon

Postby Crazy Puny Man » Tue Sep 17, 2013 12:49 pm

Plover, I think that's your cue to post the next question...you got the last one right, after all

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Re: Dynamic Planet B/C Question Marathon

Postby PacificGoldenPlover » Wed Sep 18, 2013 4:02 am

Whatever, here goes.
the first ice core ever drilled to the bottom of an ice sheet was located where?
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Re: Dynamic Planet B/C Question Marathon

Postby Crazy Puny Man » Thu Sep 19, 2013 12:14 am

God dammit! Why can I never answer your questions :x

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Re: Dynamic Planet B/C Question Marathon

Postby BYHscioly » Sat Sep 21, 2013 1:27 pm

If Google is reliable, I think the first ice core to hit bedrock was drilled in Byrd Station, Antarctica in 1968. The first one in Greenland (from my searching) that I could find was part of the GISP project and hit bedrock in 1991.

Heinrich events, where massive amounts of icebergs break off from glaciers, occur when? Is the temperature warm or cold? How do these events affect the oceans?
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Re: Dynamic Planet B/C Question Marathon

Postby PacificGoldenPlover » Wed Sep 25, 2013 2:03 am

The answer I was actually looking for was Camp Century, but I'll let you have it.

Also, I'll let someone else answer the next question :p
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Re: Dynamic Planet B/C Question Marathon

Postby PacificGoldenPlover » Tue Oct 15, 2013 11:43 pm

Oh well, I'll post the next question:

Why is the Variegated Glacier important to glaciologists? Also, where is Variegated Glacier located?
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Re: Dynamic Planet B/C Question Marathon

Postby JAKE » Thu Oct 31, 2013 1:08 am

it is important becuase it surges every 20 years and its located in Svalbard, Candidian Artic Islands, Alaska, and Ice Land

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Re: Dynamic Planet B/C Question Marathon

Postby JAKE » Thu Oct 31, 2013 1:09 am

sorry for the spelling errors


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