Shrinking Sky! Cloud Tops Dropping Closer to Earth, NASA Satellite Finds

Clouds in the sky at sunset. — The average height of clouds has dropped by about 1 percent in the last decade, new research finds.

(Image credit: Sebastian Kaulitzki, Shutterstock)

The sky is falling… sort of. Over the last 10 years, the height of clouds has been shrinking, according to new research.

The time frame is short, but if future observations show that clouds are truly getting lower, it could have an important effect on global climate change. Clouds that are lower in the atmosphere would allow Earth to cool more efficiently, potentially offsetting some of the warming caused by greenhouse gases.

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For a decade, however, the Multi-angle Imaging SpectroRadiometer on NASA's Terra spacecraft has been watching Earth's clouds. Now, Davies and his colleagues have analyzed the device's first 10 years of cloud-top height measurements from March 2000 to February 2010. They found that global average cloud height decreased by around 1 percent over the decade, a distance of 100 to 130 feet (30 to 40 meters). Most of the reduction stemmed from fewer clouds forming at very high altitudes.

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Stephanie Pappas is a contributing writer for Live Science, covering topics ranging from geoscience to archaeology to the human brain and behavior. She was previously a senior writer for Live Science but is now a freelancer based in Denver, Colorado, and regularly contributes to Scientific American and The Monitor, the monthly magazine of the American Psychological Association. Stephanie received a bachelor's degree in psychology from the University of South Carolina and a graduate certificate in science communication from the University of California, Santa Cruz.