Catastrophic Hypothesis: Could Global Warming Melt All Ice On Earth?

In the permafrost zones, a layer melts in the summer, when the temperature rises above zero. However, in the winter this layer freezes again. This is a normal process: what melts, freezes. Yet if a winter is abnormally warm, this seasonal melted layer may not freeze back. Then the so-called “talik,” a layer with a temperature of around zero, is formed. This is a very unpleasant thing for buildings and pipelines.

It seems that the permafrost should be melting if the temperature is rising. However, many areas are witnessing the opposite. The average annual temperature is getting higher, but the permafrost remains and has even started to spread. Why? An important factor is the snow cover. Global warming reduces it, therefore making the heat insulator for the permafrost thinner. Then even weak frosts are enough to freeze the ground deeper below the surface.
In many places, the frozen ground is 500-800 meters deep. Even if the highest warming forecast comes true and the temperature rises by 3-6 degrees, no more than 20 meters of frozen ground will melt. Some people are afraid that the melting permafrost will pollute the air with methane. However, frozen water takes up only 15% of the 20-meter layer, and the amount of gases dissolved there is insignificant. So we are unlikely to receive such unpleasant surprises from the permafrost within the next hundred years.

Today, scientists fear not so much global warming as changes in atmospheric circulation. In recent years, the so-called western shift has dominated, which means that air masses have been moving from the west eastwards. There has been little mention of the so-called meridian masses, moving from the south to the north and back. Now, however, the meridian shift has become more frequent. If it goes south, it causes a spell of cold weather; if it goes north, it brings warm air masses with a lot of precipitation in the winter. This results in thaws and snow drifts on plains and in heavy snowfalls, avalanches and mudflows in the mountains. Meridian processes have been gaining in frequency lately, which promises different weather anomalies: unusually high and low temperatures, heavy rains and snowfalls and longer droughts, which in turn may lead to natural calamities.

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