Climatic features of the Earth — rapid and drastic changes

15.03.2013

 

According to a study by researchers from the University of Louisiana, the Earth even after a powerful glaciation can thaw almost instantly (in geological terms, of course). When this process is the originator of this carbon dioxide. When you consider that our civilization emits a huge amount of CO2, then the news of the great mobility of the earth's climate is of particular importance.


Approximately 635 million years ago, almost the entire Earth bound ice. This glaciation, known as the Proterozoic occurred before the appearance of life. That is, it led to the formation current climatic conditions with comfortable life and high temperature oxygen. Thanks Proterozoic glaciation there was a real explosion of living organisms in the late Cambrian period, and, ultimately, a man appeared.

Until now, scientists did not understand how the tropics to the frozen earth so quickly thawed and restored the balance between the new atmosphere, hydrosphere and biosphere.

To answer this question, researchers conducted a study sulphate mineral barite (BaSO4), which has been preserved in rocks of Proterozoic glacial times. This increase in the mineral absorbs oxygen and comprises three stable isotopes of oxygen: O-16, O-17 and O-18. At the time of barite Proterozoic glacial isotope O-17 was lower than expected. Scientists suggest that this is due to a very high content of carbon dioxide in the atmosphere.

Thus, 635 million years ago, in the atmosphere of our planet taken place a very large-scale changes. Apparently, they are connected with the fact that the ocean was almost completely covered with ice. Typically, the level of carbon dioxide in the atmosphere in equilibrium with the carbon dioxide levels in the ocean. However, if the water and the air are separated by a thick layer of ice, as it was during the Proterozoic glaciation, the level of CO2 in the atmosphere is increasing dramatically.

Thus, the Proterozoic glaciation ended a powerful greenhouse effect, which is very quickly heated up the planet and, in fact, produced a comfortable "sandbox" for development of a wide range of plant and animal life on Earth. A similar increase in the concentration of carbon dioxide in the atmosphere is observed today, but today it is caused by man-made causes.

An American study also demonstrates how quickly our planet can regenerate, even after the most extensive and catastrophic events. We can not worry about our planet — it can save lives and give rise to new species in all situations. The truth is not the fact that the Earth is "taken care of" the people who do "pull the trigger" global change.

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