Air pollution has had a significant impact on the amount of water flowing through many rivers in the northern hemisphere, according to the results of a new study.
The paper shows how pollution, known as aerosols, can have an impact on the natural environment and highlights the importance of considering these factors in assessments of future climate change.
Nicola Gedney, from the Met Office and lead author of the paper, said: "We detect the impact of solar dimming on enhanced river flows over regions in the heavily industrialized northern extra-tropics.
"We estimate that, in the most polluted central Europe river basin, this effect led to an increase in river flow of up to 25% when the aerosol levels were at their peak, around 1980. With water shortages likely to be one of the biggest impacts of climate change in the future, these findings are important in making projections for the future."
It is already established that increased burning of sulphurous coal up to the late 1970s led to additional aerosols in the atmosphere. These are reflective and therefore reduce the amount of sunlight reaching the Earth's surface, an effect known as 'solar dimming'.
This dimming then started to reverse in Europe and North America with the introduction of clean air legislation and a widespread switch to cleaner fuels.
In the new study, researchers found that solar dimming increased river flows relative to that expected from surface meteorology, as the reduced amount of sunlight affected the rate of evaporation from the Earth's surface. When the dimming began to reverse, reductions in river-flows were observed.
Chris Huntingford, one of the paper co-authors based at the Centre for Ecology and Hydrology, said: "This study involved using detection and attribution techniques which were able to show a link between aerosols and changes in river flows.
"These studies normally involve looking at how different factors affect temperature, but here we've been able to attribute this man-made influence to an environmental impact."