NASA researchers have discovered that both hemispheres of the Earth are darkening. The Northern Hemisphere is darkening at a faster rate.
Báo Khoa học và Đời sống•14/10/2025
A new study based on data from 24 years of NASA satellite surveys has found that the Earth is getting darker and there is a clear difference between the Northern and Southern hemispheres. The team of experts examined data collected by the Earth and Cloud Radiation Energy System (CERES) project, with its first phase launched in 1997. (Image: buradaki/shutterstock.com) "Climate is controlled by the amount of sunlight that Earth absorbs and the amount of infrared energy emitted into space. These quantities, along with their differences, make up Earth's radiation budget (ERB), NASA explains. Image: DrPixel//Getty Images.
NASA further stated that the Earth and Cloud Radiation Energy System (CERES) project provides ERB and cloud observations from satellites. The CERES project uses measurements from instruments on multiple satellites, along with data from other sources, to create a comprehensive set of information for climate, weather, and applied science research. (Image: Dr. Pixel/Getty Images) ERBs are crucial factors driving ocean and atmospheric circulation. Therefore, accurately identifying where the Earth is receiving and losing energy is extremely important in the face of a worsening climate crisis. Through in-depth data analysis, the research team discovered that the Earth's reflectivity (the amount of solar radiation it reflects back into space) is changing. Image: ladbible. "The circulation of the atmosphere-ocean system is closely related to the distribution of radiant energy in the climate system. Using satellite observations, researchers found that while both hemispheres are darkening, the Northern Hemisphere is darkening at a faster rate due to absorbing more solar radiation than the Southern Hemisphere, but it emits higher amounts of long-wave radiation. A range of other factors such as clouds, snow cover, and water vapor in the atmosphere also contribute," the research team explained. Photo: Canva.
According to the research team, a number of other factors such as clouds, snow cover, and water vapor in the atmosphere all contribute to this effect. Photo: NASA. Previous studies have indicated that imbalances between the two hemispheres can be compensated for by ocean and atmospheric circulation. However, new research published in the journal PNAS shows that significant differences remain that ocean and atmospheric circulation cannot compensate for. Photo: warns. The research team stated that the darkening of the Northern Hemisphere compared to the Southern Hemisphere is due to changes in several characteristics such as radiation-aerosol interactions, surface reflectivity, and water vapor, which cannot be compensated for by cloud cover. This demonstrates a limit to the role of clouds in maintaining a balance of reflectivity between the two hemispheres. Photo: Jeremy Horner.
Additionally, the research team discovered that the Northern Hemisphere is warming more than the Southern Hemisphere, and the tropical regions of this area are becoming more humid, indicating large-scale changes in atmospheric circulation across the planet. Image: newspaceeconomy. Experts say further research is needed on this issue, and the Northern Hemisphere may continue to warm faster than the Southern Hemisphere, and the role of clouds in redistributing heat across the Earth may diminish. Photo: dhapress.
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