How glaciers advance – Video

This short video shows how glaciers advance during the summer melt season.

Let’s see how the media tries to twist this. They already scream that the glaciers are receding because of anthropogenic (human-caused) global warming. Will they use this to show that advancing glaciers are also proof of man-made global warming? How nice to have it both ways.

During the summer melt season, melt water accumulates in undulations on the surface of the Greenland ice sheet. Eventually, these melt lakes drain through crevasses or moulins (tunnels under the ice sheet surface), delivering water to the bottom of the ice sheet. This melt water lubricates the interface between the ice and the bedrock, causing the ice to flow faster toward the sea during summer. As summer melt increases and more melt water is available, the greater its effect on summer ice sheet flow rates.

Credit: NASA/Goddard Space Flight Center Conceptual Image Lab

If the above video doesn’t work, you can also see it here:

Thanks to RLF for this link

8 thoughts on “How glaciers advance – Video”

  1. I BET (and try to LOSE) that in the next 12 months a [AVERTABLE IF we cooperate] world devastating volcanic winter will break, after one or more at least 6-7 VEI volcanic eruptions, IF we do not cooperate to AVERT them, as it is proposed with anyone of the 3 methods, here:
    Explosive volcanic eruptions triggered by cosmic rays
    Toshikazu Ebisuzaki, Hiroko Miyahara, Ryuho Kataoka, Tatsuhiko Sato, Yasuhiro Ishimine
    Let the bet be symbolic, as WORLWIDE ALERT is the most important:
    If i lose, i sing a HAPPY volcano-winning song – if i “win”, i hope that all humankind will have been prepared for everything!
    Volcano-winner vs volcano-fatalism.

  2. This doesn’t make sense to me. If the atmosphere is warming then the glacier will melt and it likely will melt fastest at its front most point as that is also its lowest point. If it is melting at its head, then the downward pressure of the ice mass will be relieved by evaporation and melt thereby decreasing the pressure which causes it to expand. Secondly, a glacier will advance even in winter at its coldest as the greater the snow and ice accumulation at its head, the highest and coldest points of the glacier, the gravitational force of all that new accumulated ice and snow will bear down causing the glacier to expand at its extremities which are both down slope where gravity will pull the flow.

    Please explain this latest
    hypothesis as I don’t get it.

  3. Anyone know what the temperature of the ice sheet is at, say, 50 feet below the surface of the glacier? What is the air temperature above the glacier at this time? I’m curious about the amount of heat that is being transferred from air to ice. I would think “melt water” would evaporate into the air, for the most part. Don’t know, that’s why I’m asking. It’s just hard for me to visualize a pool of water sinking into the ice instead of evaporating.

  4. The Warmists will use this evidence to say: “look! the glaciers are melting and sliding into the sea”. While at the same time failing to understand the dynamics of ice-age onset and intensification.

    During an ice-age there are still four seasons. It’s just that ice accumulation will exceed melt and ablation rates thus leading to growing glaciers, increased sea-ice, lower sea levels, more desertification in the equatorial and sub-temperate zones, etc. Ice below the surface is probably at 32F, as also, icewater is always a constant 32F.

    • Do you really think that the ice is only 32 degrees? I mean, the air above it spends a large portion of the year at zero or below. This would draw heat out of the glacier and would lower the temperature of the ice mass some amount. I would think that the amount of “summer” heat above the ice would not be enough to raise the temperature of the ice mass enough to raise the temperature to the melting point at any depth. As such, I would think that water sinking through cracks in the ice would soon seal them as the water was brought below the freezing point. I recognize that the downward pressure of the ice mass could very well liquify the ice layer at the bottom, thus allowing the glacier to slide. Still, it would seem that if the mass thinned, the liquification would slow, and the glacier would slow in its advance, while the opposite would happen as it grew in mass. In other words, I would think that as the glacier grew in depth, it would move more, not less, thus the breaking off of ice sheets sliding off into the water in Antarctica, as an example, would be evidence of ice mass growth, not global warming. That’s just conjecture on my part, but it makes sense to my brand of logic, some how.

      • Yes I think that the ice at the surface – during Winter when it is below freezing – can be and is often colder than the freezing point, but you asked about the temperature of ice some tens of feet below the surface. I do think that ice at depth below surface would probably be closer to the freezing point,(perhaps only a few degrees below freezing) after all it is insulated by the ice and snowpack above. I don’t know how much additional heat can be extracted from water already frozen. Ice can be made colder than 32F , of course!, but it becomes more brittle less plastic. It is known that ice at glacial depths behaves with plasticity, while the more brittle surface layer rides along and develops fissures and crevasses. – I also agree with you re: more glacial mass = more glacial movement. That’s why I say the ‘warmistas’ FAIL to understand Ice-age, and Glacial, dynamics.

  5. When we learned about this in the 1960s we were told that ice fractures and is not a solid body Water flows down the cracks to lubricate the surface of rock beneath the ice moves as a body and breaks off at the ends of the glaciers. Is this what you are saying?

  6. They have already said that the massive surging forward of the glaciers is raising the oceans BUT, we are in luck, as the ice hits ravines and cross-flows, it slows down so we should only have about 1 meter of sea rise by the end of the century instead of 6 meters. They do not seem to understand that, if the glacier was melting away, it would be retreating from the front, not just moving forward faster due to the sumer meltwater flowing down and under the ice.

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