![]() First, the freezing temperature of salt water is lower than freshwater ocean temperatures must reach -1.8☌ (28.8☏) to freeze. Sea ice forms more slowly than freshwater for two main reasons. Lake ice tends to freeze as a smooth layer, while sea ice develops into various shapes because of the constant turbulence of ocean water. This sets it apart from other forms of ice like icebergs, glaciers, and lake ice, which form from fresh water or snow. Sea ice grows, forms, and melts strictly in salty ocean water. 13, 2012, in the Bellingshausen Sea with the Digital Mapping System (DMS) on board the NASA DC-8 flying laboratory. This complex mixture of different types of Antarctic sea ice was photographed on Oct. Multiyear ice is ice that has survived a summer melt season and is much thicker than younger ice, typically ranging from 2 to 4 meters (78.7 to 157.5 inches) thick.First-year ice is thicker than 30 centimeters (11.8 inches), but has not survived a summer melt season.gray-white ice (15 to 30 centimeters, or 5.9 to 11.8 inches thick).gray ice (10 to 15 centimeters, or 3.9 to 5.9 inches thick).Young ice is sometimes split into two subcategories, based on color: As the ice thickens, it enters the young ice stage, defined as ice that is 10 to 30 centimeters (3.9 to 11.8 inches) thick.New ice is a technical term that refers to ice less than 10 centimeters (3.9 inches) thick.The World Meteorological Organization (WMO) has defined the following categories: However, for some applications more detailed classification is used, such as for navigational purposes, where finer detail on the age and thickness of the sea ice is needed. A simple classification categorizes sea ice into two primary age groups: first-year or multiyear. Sea ice is classified by stages of development that relate to thickness and age. ![]() Exchange for Observations and Local Knowledge of the Arctic (ELOKA).NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).Greenland Today & Antarctic Ice Sheet Today.A part of CIRES at the University of Colorado Boulder
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