Trends in sea ice thickness/volume are another important indicator of Arctic climate change. The freezing temperature of salt water is lower than fresh water; ocean temperatures must reach -1.8 degrees Celsius (28.8 degrees Fahrenheit) to freeze.

This graph shows monthly ice extent anomalies plotted as a time series of percent difference between the extent for the month in question and the mean for that month based on the January 1981 to December 2010 data. It is a source for consistently processed ice extent and concentration images and data values since 1979. As a result, areas covered by sea ice don't absorb much solar energy, so temperatures in the polar regions remain relatively cool.

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. For virtually the entire 2017-2018 Bering Sea ice season, the extent was at a record low (Fig. In contrast, icebergs, glaciers, ice sheets, and ice shelves all originate on land. Sea Ice Index. The monthly Sea Ice Index provides a quick look at Arctic-wide changes in sea ice. September 2012 had the lowest sea ice extent ever recorded, 44 percent below the 1981–2010 average for that month. It is a source for consistently processed ice extent and concentration images and data values since 1979. Daily extent images show ice extent at concentrations greater than 15% for a given day with an outline of the typical extent for that day based on a 30-year (1981-2010) median (orange line).The monthly Sea Ice Index provides a quick look at Antarctic-wide changes in sea ice.

Data source: Fetterer, F., K. Knowles, W. Meier, and M. Savoie.

Platform(s): DMSP, DMSP 5D-3/F17, DMSP 5D-3/F18, Nimbus-7: Data Center(s): NOAA: Instrument(s): SSM/I, SSMIS, SMMR: Version: 3 This difference in density explains why ice cubes float in a glass of water. On average, sea ice covers about 25 million square kilometers (9,652,553 square miles) of the Earth, or about two-and-a-half times the area of Canada. NOAA reported that the June 2019 Antarctic sea ice extent was 8.5% below the 30-year (1981 – 2010) average. Cold, dense, polar water sinks and moves along the ocean bottom toward the equator, while warm water from mid-depth to the surface travels from the equator toward the poles. It provides consistently processed daily ice extent and concentration images and data since 1979.

In contrast, icebergs, glaciers, ice sheets, and ice shelves all originate on land. much total sea ice there is. The graph also includes a comparison line for the 1981 through 2010 average (solid grey line) that is plotted for the previous four months as well as the upcoming month. Although it may not directly affect us, it is a critical component of our planet because it influences climate, wildlife, and people who live in the Arctic. In the Southern … Other maps show sea ice concentration and anomalies and trends in concentration. The light gray area around the 1981-2010 average line shows the two standard deviation range of the data. 2002, updated until 2010.

Key Points. This chain of events starts a cycle of warming and melting.

Water below sea ice has a higher concentration of salt and is more dense than surrounding ocean water, and so it sinks. During February, typically the height of the winter season, the Bering Sea actually lost significant ice cover.

Thought it may be interesting to know NSIDC is working to keep us happy. It forms, grows, and melts in the ocean. Other monthly images show sea ice concentration and anomalies and trends in concentration.The daily Sea Ice Index provides a quick look at Antarctic-wide changes in sea ice.

When sea ice forms, most of the salt is pushed into the ocean water below the ice, although some salt may become trapped in small pockets between ice crystals. In the Arctic, sea ice can be an obstacle to normal shipping routes through the Northern Sea route and Northwest Passage.


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