Spring comes earlier because of climate change

Photo: anhso.net.

American scientists announced this spring to the continents 1.7 days earlier than the first half of the 20th century.

Summer, autumn and winter also start 1.7 days earlier. In addition, the temperature difference between winter and summer is decreasing.

The shift of time of the seasons takes place uniformly on land, but on oceans this phenomenon does not occur. Alexander Stine, a student of Earth and Planet Science at the University of California (USA), thinks that the physical changes of the Earth's climate system are the cause of the early seasons. than.

'The earth is warming and we all know people are important for climate change. There is nothing unreasonable when many people think that the movement of seasons and climate change has some relationship, ' Alexander said.

A previous study has documented the early arrival of spring based on biological factors, such as the time of flowering and migratory animals. However, Alexander and his colleagues were interested in physical factors. They explored the speed of the Earth's reaction to the Sun's activity.

The tilt of the Earth towards the Sun creates seasons. The time of solar energy reaches the maximum and the time when the hottest Earth does not match because the Earth takes 30 days to absorb all of the Sun's energy.

A recent study shows that many areas of the planet are deserted due to climate change. Alexander thinks that the amount of water in the soil decreases, making the sun absorb more heat. As the drought level of the earth is increasing, the time delay (30 days) that the Earth needs to absorb all the heat from the Sun is decreasing.

Michael Mann, director of the Center for Earth Sciences at the University of Pennsylvania and not participating in Alexander's study, commented that Alexander's finding fits well with his observations more than a decade ago. But at that time he could not find a way to explain this phenomenon.

According to Alexander, changes in the direction and strength of the wind, the increasing dryness of the soil (making the ability to absorb heat from the Sun increase) are also factors that cause the movement of seasons.