Formation of coal occurred 300 million years ago.
Scientists said that the formation of deposits of coal that occurred 300 million years ago, led to a decrease in carbon dioxide in the atmosphere and likely icing of a significant part of the Earth’s surface.
In the study, researchers used a complex climate model, which included components for modeling water circulation in the ocean, air in the atmosphere and dynamical systems, describing the possible formation of ice from seawater. The boundary conditions were used conditions that were on Earth about 300 million years ago.
One of the most important parameters, which affect climatic changes on the planet are the orbital cycles that cause changes in the level of solar irradiance depend on the tilt of the earth axis. Scientists estimate that depending on the angle of the earth’s axis in that time, the content of 0.1 ppm of carbon dioxide in the atmosphere should lead to the average temperatures from -1,4 to 0.5 degrees Celsius.
The process of formation of a glacier is the result of a positive feedback between glacier and albedo. Began to form a glacier reduces the amount of light absorbed by the surface, which leads to further decrease of temperature and increase of area. The simulation results for the beginning of the formation of the glacier, by this mechanism the carbon dioxide levels in the atmosphere were to drop below 0.04 ppm.
According to previous works, the carbon dioxide content of the early Permian period fell to 0,02–0,18 ppm. This probably led to the covering of a significant part of the planet’s surface with ice. According to scientists, at the time the Land was in conditions that could even lead to complete glaciation of the earth’s surface. The hypothesis of “Earth-snow”, completely covered with ice usually expressed for other glacial periods, in particular for kriganovskogo period. A new study has found that orbital cycles and the release of carbon from the carbon cycle could lead to complete glaciation during the late Carboniferous period.
Earlier it was reported that scientists have predicted the little ice age in the 2030-2040-ies. According to scientists, the processes that occur in the two layers of the Sun (one in the Convention area and the second – closer to the surface), for the period of the 26th cycle peaked at about the same time but on opposite sides of the star. Therefore, they cancel each other out, leading to a sharp drop in solar activity in General.