A recent study has provided fresh insight into the importance of the Sun in the climate change. The study showed that the Sun’s impact is not constant all over the time but has higher importance when the Earth is cooler.
According to the researchers, there seems to have been a close link existing between solar activity and the temperature of sea surface in summer in the North Atlantic region during the last 4,000 years. However, this correlation is not appearing in the preceding period.
Marit-Solveig Seidenkrantz, a professor at Denmark’s Aarhus University, said, “Sun is an important celestial body that plays significant role in our climate change but the impact is not clear. Climate change appears to be either strengthened or weakened by solar activity.”
“The extent of the influence of Sun over time is thus not constant, but we can now conclude that the climate system is more receptive to the impact of the Sun during cold periods – at least in the North Atlantic region,” Seidenkrantz said.
For the study, the researchers looked at the temperatures of sea surface in the northern part of the North Atlantic during the last 9,300 years. Direct temperature measurements are just found for the last 140 years, when the records were gathered by ships.
By analysing the studies of marine algae present in the deposited sediments on the sea bed in North Atlantica, it is possible to use the species distribution of these organisms for reconstructing the temperature fluctuations of sea surface much further back in time.
Seidenkrantz said, “Even though the new information is small, it offers an important piece of the overall picture of the working of the complete climate system.”
The detailed research work also allows the scientists to draw comparisons with the available records of fluctuations of solar energy bursts during the same period.
The findings of the study were published in the journal Geology.