Ice that has rested for centuries on Alaskan land can, under the right conditions, be set moving much faster by something as ordinary as rain. A report carried by Phys.org and picked up by Google News notes that heavy rainfall can more than double the flow speed of some glaciers there, because water that reaches the bed beneath the ice acts as a lubricant. The finding is still thin on detail, naming neither the glaciers nor the scale of the storms, yet it points to a reminder that a changing climate can work on the frozen world through channels that are easy to overlook.
Heavy Rain Can More Than Double Glacier Speeds in Alaska
Rain reaches the bed of a glacier and lubricates it
Mark
So what is actually being claimed here?
Mimi
That heavy rain can more than double how fast some Alaskan glaciers flow. The explanation is that rain gets down to the glacier bed and lubricates it, so the ice slides faster.
Mark
Why does that matter beyond Alaska?
Mimi
It treats rain as something that moves ice, not just something that falls on it. If extreme rain becomes more common, glacier behavior and sea-level contributions could shift faster than expected.
Luke
I want to slow down on that last part. Is it measured or projected?
Mimi
Projected. It's the forward-looking implication, not a result.
Luke
Then it should be read that way. And the doubling figure, do we know what it's measured against?
Mimi
No. There's no baseline speed, no named glacier, and no rainfall amount in what we have.
Luke
So we can't say how typical this is. The word is some glaciers, not all.
Mark
Is there anything we can say firmly?
Mimi
Only the headline claim and the mechanism as reported. The details are in the full article.
Luke
Which is where I'd go before repeating the number to anyone.
O Pulso
- A single heavy rainstorm can more than double how fast certain Alaskan glaciers are sliding.
- Rain seeping to the glacier bed works like a lubricant, letting massive ice masses slip with unexpected speed.
- The finding unsettles assumptions that glacier movement follows mainly temperature and snowfall.
- With extreme rain events growing more common, scientists must now ask how quickly glaciers and their sea-level contributions could shift.
Ice that has rested for centuries on Alaskan land can, under the right conditions, be set moving much faster by something as ordinary as rain. A report carried by Phys.org and picked up by Google News notes that heavy rainfall can more than double the flow speed of some glaciers there, because water that reaches the bed beneath the ice acts as a lubricant. The finding is still thin on detail, naming neither the glaciers nor the scale of the storms, yet it points to a reminder that a changing climate can work on the frozen world through channels that are easy to overlook.
A short report from Phys.org, carried by Google News, makes a striking claim: heavy rainfall can more than double the speed of some glaciers in Alaska. The wording is careful. It speaks of some glaciers and of what can happen, not of every glacier or every storm.
The mechanism is direct. Rain reaches the place where ice meets rock and sediment at the base of a glacier and lubricates it. Better lubricated, the ice slides more easily, and its movement can accelerate quickly. Rain, in this account, is a driver of glacial motion in its own right.
What the available material leaves out matters just as much. It does not name the glaciers, the researchers, the time frame, or the size of the storms, and it offers no baseline speeds to measure the change against. The full Phys.org article and the underlying study would be needed to judge how widely the finding applies.
The implication looks forward. If extreme rain grows more frequent, glacier dynamics and their contribution to sea level may shift faster than expected. That remains an interpretation of where the finding points, to be tested by the work itself.
A headline from Phys.org, picked up by Google News, makes a single claim: heavy rain can more than double the speed of glaciers in Alaska. The text available here is little more than that headline, so the story that can be told with confidence is a short one.
The report's central finding, as summarized, is that heavy rainfall can more than double the flow speed of some Alaskan glaciers. The wording matters. It says some glaciers, and it says can. It does not say every glacier, and it does not say every storm.
The mechanism described is a direct one. Rain reaches the bed of a glacier, the place where ice meets rock and sediment, and lubricates it. A glacier that is better lubricated at its base slides more easily, and the movement of the ice can accelerate rapidly as a result. The report presents rain as a driver of glacial movement in its own right, not only a bystander to temperature and snowfall.
The material provided does not name the glaciers studied, the researchers, the institution behind the work, the time period of observation, or the size of the rainfall events involved. It also gives no figures beyond the idea of doubling, so there is no baseline speed to compare against and no measurement of how long the acceleration lasted. Those details would be in the full Phys.org article, and they would be needed to judge how widely the finding applies.
The forward-looking implication is that extreme rain events are becoming more frequent. If so, the way glaciers move, and what they contribute to sea level, may change faster than expected. That is an interpretation of where the finding points, not a measured result in the material available here.
For readers who want to follow this, the useful next step is the original Phys.org report and the study behind it. The questions to look for are which glaciers were measured, how much rain triggered the speedup, and whether the faster flow persisted or faded once the rain stopped.
Quer a matéria completa?
Leia o original em Google News ↗
Climate & Environment