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A giant ice cave under the Antarctic Sweitz Glacier

Xinhua News Agency, Beijing, February 5th> Researchers from NASA and other agencies recently reported that they found a giant ice cave at the bottom of the Svetz Glacier in the southwestern pole, about three cents in Manhattan, New York. Second, it shows that climate change has caused the melting of Antarctic glaciers and sea level rise faster than previously expected.

This giant ice cave is one of the major findings of the NASA-led Icebridge Action Report. The survey, which began in 2010, reveals the impact of global warming on the polar regions through aerial photography and other means, with the help of next-generation satellites and ice-detecting radars. A technique called radar interferometry is also used in the study to process high-resolution data and reveal surface changes.

The researchers had expected to find some gaps between the ice and bedrock at the bottom of the Sweitz Glacier. The result was an amazingly small ice cave. It was about 300 meters high and had an area of ​​about 40 square kilometers. It can hold 14 billion tons of ice, and researchers believe that most of the missing ice has melted in the past three years.

The related paper was published in the new issue of the American Journal of Scientific Progress.

For several years, we have been skeptical that the Sweitz Glacier is not tight enough to attach to the underlying bedrock. Eric Rinio, co-author of the paper and NASA's Jet Propulsion Laboratory, said that the new generation of satellites made them Finally see the details.

The first author of the paper, Pietro Millillo of the US Space Agency's Jet Propulsion Laboratory, explained that the size of the cavity at the bottom of the glacier plays an important role in the melting process, and that seawater can flood into the cave and disintegrate the glacier from the bottom. The more heat-carrying seawater flows into the bottom of the glacier, the faster it melts.

The researchers say that the current global model of global warming that causes the ice cap to melt does not take into account that the caves under the ice will grow. This new finding suggests that the limitations of existing models have severely underestimated the melting rate of the Sweitz Glacier.

The area of ​​the Sweitz Glacier is comparable to that of Florida, USA, and contributes about 4% of the current global sea level rise. Related studies suggest that the melting of the Sivets glaciers will cause the global sea level to rise by 65 centimeters; and if the Sweitzer Glacier disappears completely, its associated effect on the melting of nearby glaciers will raise the sea level by another 2.4 meters.

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