Antarctic Sea Glacier is Melting Fast

Antarctic Sea Glacier is Melting Fast
Antarctic Sea Glacier is Melting Fast - Summer was in full swing in the Southern Hemisphere when NASA's Aqua satellite captured this image of the Antarctic Peninsula amid an unusually clear sky on December 11, 2022. The decline of Antarctic sea ice so far in the 2022-2023 season has been particularly severe. Image via Joshua Stevens / NASA Earth Observatory.

On December 11, 2022, the NASA Aqua satellite's Medium Resolution Imaging Spectroradiometer captured the image shown above (MODIS). The image shows a section of the Antarctic Peninsula about 1.000 kilometers (600 miles) long. This icy and snowy peninsula stretches across the Southern Ocean towards South America. To the east of the peninsula is the Larsen Ice Shelf, a huge glacial floating platform. Beyond that, sea ice is drifting in the Weddell Sea.

Sea ice was melting and breaking up all over the continent when Aqua took this top image. This is because it is summer in the Southern Hemisphere. Antarctica usually experiences seasonal sea ice melting, which begins in September and lasts until February. However, the 2022-2023 season has seen a particularly sharp decline so far. According to the National Snow and Ice Data Center, the amount of sea ice surrounding Antarctica by the end of December 2022 was the least in 45 years of satellite records. Strong winds and warm temperatures likely played a role in the rapid decline.

Some of the chunky chunks of ice drifting down Weddell are actually icebergs breaking off the Larsen Ice Shelf pictured above. This means that not all of the ice is made up of seawater. Ice from the ice shelf, which first broke off in late November 2022, is represented by the iceberg cluster towards the bottom of the photo. On December 31, 2022, the Operational Land Imager-9 (OLI-2) on Landsat 2 captured an in-depth view of the icebergs above.

On November 27, 2022, the European Space Agency's Sentinel-1a satellite confirmed the rupture. Using this information, Christopher Reader, an ice analyst at the US National Ice Center (USNIC), has identified several icebergs at least 10 nautical miles long and large enough to be named and tracked by the USNIC. The largest iceberg was the A-17A, which was about 9,2 kilometers (19 nautical miles) wide and 10,3 kilometers (80 nautical miles) long. It remained at this size until at least January 6, 2023.

Summary: Satellite images taken in Antarctica on particularly clear days during the previous month. There was a particularly rapid decrease in sea ice in the 2022-2023 season. According to the National Snow and Ice Data Center, the amount of sea ice in Antarctica as of the end of December 2022 was the least in 45 years of satellite records.

source: earthsky.org

 

Günceleme: 18/01/2023 15:47

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