The Earth is reflecting less sunlight back into space, according to a new study led by Dr. Norman G. Loeb from NASA’s Langley Research Center.
The research team analyzed satellite data from the past 24 years and found that both the Northern and Southern Hemispheres have become darker since 2001. The Northern Hemisphere is absorbing an additional 0.34 watts per square meter per decade, while the Southern Hemisphere is also becoming darker, but to a lesser extent. Although some of this increase is offset by air and ocean currents, a net increase of 0.21 watts per square meter per decade remains.
Several factors contribute to the reduced reflection of sunlight. In the Arctic, areas of snow and ice are shrinking, causing darker surfaces to absorb more energy. Air pollution has decreased in Europe, China, and the US, leading to fewer suspended particles and less cloud formation, which in turn reflects less radiation.
Earth absorbing more sunlight energy
The Southern Hemisphere has experienced temporary increases in reflection due to bushfires and the volcanic eruption of Hunga Tonga, which released extra aerosols into the atmosphere. However, these events have not been enough to offset the long-term trend of darkening.
The reduction in reflected sunlight suggests that equalization mechanisms, such as clouds and ocean currents, are no longer fully effective. This means that Earth, especially the Northern Hemisphere, is storing more energy over the long term, which could lead to additional warming in regions like Europe and North America. Dr.
Loeb emphasizes the importance of including these changes in climate models to better understand the Earth’s changing climate. The study raises questions about whether the global system can rebalance in the long term or if the symmetry break between the hemispheres will persist. The research highlights the need for a reassessment of existing climate models to account for these observations and aid in better understanding the future of global climates.
As the Earth continues to darken, it is crucial to monitor these changes and their potential impacts on our planet.
