Activity 2.2 - Cryosphere: Palisade Glacier, California

Original Photo 1929 


Second Photo 2013


Google Earth Viewing August 2022



Palisade Glacier, California 1929-2022

If you look at old photos of glaciers, like the Palisade Glacier in the Sierra Nevada taken back in 1929, and then compare them with rephotographs from 2013, the difference is enormous. The glacier that once stretched far down the mountain has pulled way back, looking thinner, smaller, and more broken up. This change isn’t just about one glacier in California—it’s part of a bigger global pattern we’re seeing everywhere. Glaciers are shrinking rapidly, primarily due to climate change. Glaciers depend on a balance between snowfall in the winter and melting in the summer. For thousands of years, they held steady because snow would build them back up as fast as the warmer months melted them down. But now, with warmer global temperatures, summers are hotter, and winters often don’t bring enough snow to replace what’s lost. Year after year, this imbalance adds up, and the result is glaciers retreating higher and higher up the mountains. This has some pretty significant consequences. Glaciers aren’t just pretty chunks of ice sitting in the hills—they act like natural water storage. When they melt in the summer, they feed rivers and streams, which helps provide water for plants, animals, and people living downstream. As glaciers disappear, that reliable source of meltwater is fading away. In the long run, that means less water for farming, drinking, and keeping ecosystems alive, especially in drier regions like California. Seeing the before-and-after photos makes the problem really hit home. Data and numbers about climate change can feel abstract, but when you can literally see the ice vanish over just a few decades, it’s hard to ignore. The retreat of glaciers like the Palisade is a clear reminder that climate change is real and already reshaping our world.

Problem:

The primary issue with glaciers right now is that they’re melting significantly faster than they should be. Hotter summers due to climate change are causing them to lose more ice, and winters aren’t providing enough snow to compensate. That means every year, they shrink a little more and pull back farther up into the mountains. It’s not just about them looking smaller, either—glaciers are like giant natural water tanks. They slowly release meltwater into rivers and streams that people, animals, and farms depend on. If the glaciers keep disappearing, that steady flow of water will drop off, which makes it harder for communities to get drinking water and harder for farmers to grow crops. It also disrupts mountain environments, as melting ice can trigger rockslides and alter the habitats of certain plants and animals. On top of all that, glaciers are one of the most evident signs of climate change—you can literally see the difference in old photos compared to today. So, the problem isn’t just losing ice; it’s losing water, stability, and one of the most prominent warnings that our climate is in serious trouble.

Explanation: 

Glaciers are shrinking because the balance they need to survive is being disrupted. Usually, they work kind of like a bank account—snow in the winter adds to them, and melting in the summer takes away from them. As long as the “deposits” and “withdrawals” are even, the glacier stays healthy. But with the planet heating up, summers are hotter, so way more ice melts than before. At the same time, winters often don’t bring enough snow to make up for it, and sometimes what should fall as snow falls as rain instead. That means glaciers are losing more than they’re gaining every year, and the result is they keep getting smaller and moving farther up the mountains. You can actually see this in side-by-side photos taken decades apart—it’s super obvious how much they’ve pulled back. So, the explanation is pretty simple: climate change is making glaciers melt faster than they can rebuild, and that’s why they’re disappearing.


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