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Music: Children's Carousel by Maxi Schulze [GEMA], Moritz Limmer [GEMA]

Complete transcript available.

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The yellow line indicates the 30 year average maximum extent calculated from 1981 through 2010. The date is shown in the upper left corner.", "width": 1024, "height": 576, "pixels": 589824 } }, { "id": 4510, "url": "https://svs.gsfc.nasa.gov/4510/", "page_type": "Visualization", "title": "Weekly Animation of Arctic Sea Ice Age with Graph of Ice Age By Area: 1984 - 2016", "description": "One significant change in the Arctic region in recent years has been the rapid decline in perennial sea ice. Perennial sea ice, also known as multi-year ice, is the portion of the sea ice that survives the summer melt season. Perennial ice may have a life-span of nine years or more and represents the thickest component of the sea ice; perennial ice can grow up to four meters thick. By contrast, first year ice that grows during a single winter is generally at most two meters thick.Below is an animation of the weekly sea ice age between 1984 and 2016. The animation shows the seasonal variability of the ice, growing in the Arctic winter and melting in the summer. In addition, this also shows the changes from year to year, depicting the age of the sea ice in different colors. Younger sea ice, or first-year ice, is shown in a dark shade of blue while the ice that is four years old or older is shown as white. A color scale identifies the age of the intermediary years.A graph in the lower, right corner the quantifies the change over time by showing the area in millions of square kilometers covered by each age category of perennial sea ice. This graph also includes a memory bar - the green line that here represents the current maximum value seen thus far in the animation for the particular week displayed. For example, when showing the first week in September, the memory bar will show the maximum value seen for all prior years' first week of September since the beginning of the animation (January 1, 1984).Correction: The original release on 10/28/2016 incorrectly labeled the oldest category on the graph as \"5+\". This was corrected to read \"4+\" on 10/30/2016. || ", "release_date": "2016-10-28T11:00:00-04:00", "update_date": "2025-02-02T22:28:21.554535-05:00", "main_image": { "id": 419043, "url": "https://svs.gsfc.nasa.gov/vis/a000000/a004500/a004510/weeklySeaIceAge_withSqKmGraph_4k.4944_print.jpg", "filename": "weeklySeaIceAge_withSqKmGraph_4k.4944_print.jpg", "media_type": "Image", "alt_text": "This visualization shows the age of the Arctic sea ice between 1984 and 2016. Younger sea ice, or first-year ice, is shown in a dark shade of blue while the ice that is four years old or older is shown as white. A bar graph displayed in the lower right corner quantifies the area in square kilometers covered by each age category of perennial sea ice.", "width": 1024, "height": 576, "pixels": 589824 } } ], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }