A new study published in the journal Science suggests that the Earth’s darkening surface may have contributed to the record heat experienced in 2023. Climate scientists had been searching for explanations behind the extreme warming, but a reduction in low cloud cover, which reflects sunlight back into space, has been identified as a potential factor.
According to the study, low clouds cover roughly four percent less than usual, resulting in more heat being absorbed by the Earth’s surface. While this may seem like a small change, it could have significant implications for future warming.
Researchers are still unsure if this is due to natural variability or human activities such as shipping regulations that reduced sulfur dioxide emissions, which can create clouds. However, climate scientists warn that the warming of oceans and changes in ocean circulation also play a role.
The study’s findings highlight the uncertainty surrounding cloud cover, which is one of the biggest uncertainties in climate modeling. If this trend continues, it could indicate a higher climate sensitivity and potentially more severe future warming.
While the new discoveries are not definitive answers, they provide a clearer understanding of what to look for when trying to explain extreme years like 2023. As researchers continue to investigate, they remain cautious about the potential implications of these findings.
Source: https://www.cbc.ca/news/science/earth-warming-albedo-1.7401969