2020年2月4日 · But a recent study shows some subpopulations of polar bears are struggling to complete these essential tasks because of declining concentrations of Arctic sea ice. The Arctic sea ice cap is a large area of frozen seawater floating on top of the Arctic Ocean and its surrounding seas and straits.

2024年4月1日 · In this image, arced areas of warmer temperatures indicate thinner ice or open water where sea ice is being blown offshore, away from fast ice in the Larsen A and B embayments. July 23, 2023 Features in the image get considerably colder to the south.

2021年1月5日 · Dominated by thin first-year ice, along with some older ice thinned by warm ocean water, the Arctic sea ice pack is becoming more fragile. In summer 2020, ships easily navigated the Northern Sea Route in ice-free waters, and even made it to the North Pole without much resistance.

2012年12月24日 · Polar Bears Struggle as Sea Ice Declines. A new study shows that polar bears are spending less time on sea ice, leading them to fast longer, become thinner and have fewer cubs. Image of the Day Heat Land Life Snow and Ice Remote Sensing

Declining sea ice will lead to a loss of habitat for seals and polar bears; it also should increase encounters between polar bears and humans. Indigenous peoples in the Arctic have already described changes in the health and numbers of polar bears.

2020年2月18日 · The new summer lows, combined with poor wintertime recoveries, have fueled a persistent decline in Arctic sea ice. Since 2002, ice extent at the summer minimum has not returned to anything approaching the long-term average.

2022年6月16日 · They found that southeastern polar bears are cut off from sea ice for two-thirds of the year. From late May until the sea ice returns in February, the bears hunt from atop the pieces of broken glacial ice floating at the front of glaciers—a mixture known as mélange.

How were the polar ice caps formed, and where did the water that they are made of come from? How can scientists measure fluctuations in carbon sequestration in the forest?

2023年11月26日 · Perched high in the Andes, Peru’s Quelccaya Ice Cap stores centuries of climate change history in its ice. Its melting edges tell a more immediate climate story. Image of the Day Snow and Ice

2024年3月25日 · Scientists with NASA and the National Snow and Ice Data Center (NSIDC) at the University of Colorado, Boulder, track these seasonal and annual fluctuations because sea ice shapes Earth’s polar ecosystems and plays a significant role in global climate.