DEFINITION OF CRYOSPHERE

The notion of cryosphere is not part of the dictionary prepared by the Royal Spanish Academy ( RAE ). The concept, however, is often used with reference to the surface water of our planet that is in a solid state due to low temperatures.

The cryosphere, in this setting, is made up of the Earth ‘s large masses of ice and snow. Therefore we can find the cryosphere in Antarctica and the North Pole, among many other regions, such as Greenland, Northern Siberia, the Arctic Ocean and Northern Canada and most of the peaks of the highest mountain ranges. of the world.

When the cryosphere originates from the freezing of the oceans, it does not affect the sea level, since solid water is formed from it. On the other hand, if the glaciers melt, they do cause a rise in sea level. The global warming that affects the cryosphere and causes the glaciers to melt, therefore, is causing the sea level to rise, a situation that could cause various territories to remain under water in the future.

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Most of the cryosphere is made up of icebergs. Glaciers, sea ice, and permafrost contribute the rest of the solid water surface. It is estimated that about three quarters of the planet ‘s freshwater reserves are found in the cryosphere.

The effects of climate change on the cryosphere are multiple, affecting life in general. The cryosphere itself, by melting, contributes to global warming since solid water (ice and snow) reflects solar energy, which returns to space. Instead, as ice and snow melt, the soil is exposed and the Earth’s surface absorbs more of the sun’s energy, which is then radiated back into the atmosphere, warming it.

We must highlight the importance of the role played by the cryosphere in regulating the climate of the entire planet. The reason certain parts of Antarctica can reflect close to 90% of the sun’s incident radiation is that ice and snow have a high albedo.

Albedo is the percentage of radiation reflected by a surface compared to that incident on it. By definition, light-colored surfaces have higher albedo values ‚Äč‚Äčthan dark ones, just as bright ones outperform dull ones. The average albedo of our planet is around 38%.

The albedo is dimensionless, that is, it is a magnitude that does not have an associated physical dimension. Its measurement is carried out taking as reference a scale that begins at zero and reaches one as the maximum value. At the first extreme are the bodies that absorb all of the incident radiation, a theoretical object known as a black body ; the value “one” corresponds to a white body capable of reflecting all the radiation that falls on it.

Precisely, recent snow has an albedo of 86%, the highest value on our planet. If the cryosphere did not exist, therefore, the Earth’s albedo would be much lower, its surface would absorb a greater amount of energy and, consequently, the temperature of the atmosphere would also be higher.

Another role of the cryosphere is the disconnection of the oceans and the atmosphere, which reduces the transfer of moisture and momentum (the mass of a body multiplied by its speed at a given point in time); this helps stabilize energy transfers at the atmospheric level.

CRYOSPHERE