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Arctic ice pack - Video Learning - WizScience.com

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The "Arctic ice pack" is the ice cover of the Arctic Ocean and its vicinity. The Arctic ice pack undergoes a regular seasonal cycle in which ice melts in spring and summer, reaches a minimum around mid-September, then increases during fall and winter. Summer ice cover in the Arctic is about 50% of winter cover. Some of the ice survives from one year to the next. Currently 28% of Arctic basin sea ice is multi-year ice, thicker than seasonal ice: up to 3 to 4 meters thick over large areas, with ridges up to 20 meters thick. As well as the regular seasonal cycle there has been an underlying trend of declining sea ice in the Arctic in recent decades. Sea ice has an important effect on the heat balance of the polar oceans, since it insulates the warm ocean from the much colder air above, thus reducing heat loss from the oceans. Sea ice is highly reflective of solar radiation, reflecting about 60% of incoming solar radiation when bare and about 80% when covered with snow. This is much greater than the reflectivity of the sea and thus the ice also affects the absorption of sunlight at the surface. The sea ice cycle is also an important source of dense "bottom water". While freezing, water rejects its salt content, leaving pure ice. The remaining surface water, made dense by the extra salinity, sinks, leading to the production of dense water masses such as North Atlantic Deep Water. This production of dense water is a factor in maintaining the thermohaline circulation, and the accurate representation of these processes is important in climate modelling. Wiz Science™ is "the" learning channel for children and all ages. SUBSCRIBE TODAY Disclaimer: This video is for your information only. The author or publisher does not guarantee the accuracy of the content presented in this video. USE AT YOUR OWN RISK. Background Music: "The Place Inside" by Silent Partner (royalty-free) from YouTube Audio Library. This video uses material/images from https://en.wikipedia.org/wiki/Arctic+ice+pack, which is released under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . This video is licensed under Creative Commons Attribution-Share-Alike License 3.0 http://creativecommons.org/licenses/by-sa/3.0/ . To reuse/adapt the content in your own work, you must comply with the license terms.
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