An international team of researchers from China and Australia found that the southern hemisphere has been drying out more than the northern hemisphere over the past two decades (2001-2020), Report informs.
The results of the study were published in the scientific journal Science.
The authors suggest the principle cause is the weather phenomenon known as El Niño, which occurs every few years when ocean water in the eastern Pacific is warmer than usual.
The findings are based on data from satellites and measurements of river and stream flows, which enabled the authors to model and calculate changes in water availability. Water availability is the net difference between the amount of water supplied to the landscape, in the form of rainfall on land, and the water removed to the atmosphere by general evaporation or by plants through their leaves.
The new analysis reveals a strong decrease in water availability in South America, most of Africa, and central and northwestern Australia. However, some regions such as the southern part of South America will have more water available.
Drying will change vegetation patterns and further increase temperatures, which could be above 35°C for large parts of the year by 2100 if emission rates continue to be high. This would have severe effects on the health of humans and habitats.