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Sea ice. Broken pieces of Arctic sea ice with a snow cover. Sea ice arises as seawater freezes. Because ice is less dense than water, it floats on the ocean's surface (as does fresh water ice, which has an even lower density). Sea ice covers about 7% of the Earth's surface and about 12% of the world's oceans. [1] [2] [3] Much of the world's sea ...
Ice–albedo feedback is a climate change feedback, where a change in the area of ice caps, glaciers, and sea ice alters the albedo and surface temperature of a planet. Because ice is very reflective, it reflects far more solar energy back to space than open water or any other land cover. [1] It occurs on Earth, and can also occur on exoplanets.
Global warming, caused by greenhouse gas forcing is responsible for the decline in Arctic sea ice. The decline of sea ice in the Arctic has been accelerating during the early twenty‐first century, with a decline rate of 4.7% per decade (it has declined over 50% since the first satellite records). [73] [74] [75] Summertime sea ice will likely ...
But the region is hugely significant: the Antarctic ice sheet already sheds an average of 150 billion metric tons of ice every year and, in its entirety, it holds enough water to raise global sea ...
Rheumatoid arthritis ( RA) is a long-term autoimmune disorder that primarily affects joints. [1] It typically results in warm, swollen, and painful joints. [1] Pain and stiffness often worsen following rest. [1] Most commonly, the wrist and hands are involved, with the same joints typically involved on both sides of the body. [1]
To estimate ice area, scientists calculate the percentage of sea ice in each pixel, multiply by the pixel area, and total the amounts. Scientists set a threshold percentage to estimate ice extent, and count every pixel meeting or exceeding that threshold as "ice-covered." The common threshold is 15 %.
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