These images using satellite-derived sea ice concentration data show average minimum and maximum sea ice during March and September for the Arctic and Antarctic from 1979 to 2000. Seasons are opposite between the Southern and Northern Hemispheres; the South reaches its summer minimum in February, while the North reaches its summer minimum in September. (March is shown for both hemispheres for consistency.) The black circles in the center of the Northern Hemisphere images are areas lacking data due to limitations in satellite coverage at the North Pole. —Credit: National Snow and Ice Data Center, University of Colorado, Boulder, Colorado.
There are two warnings about melting ice and rising oceans:
1. one is by land,
2. the other, by sea. But it’s ice sheets on land, not icebergs in the ocean, that are the biggest contributors to sea level rise. Land ice includes mountain glaciers and ice sheets, covering Greenland and Antarctica. These giant blocks of ice are melting and the water is flowing rapidly into the oceans. Think of it like adding water to an already full glass – it soon overflows. But melting sea ice behaves differently. Axel Schweiger is a researcher at the University of Washington.
Schweiger said: "Melting sea ice has no impact on sea level rise because it’s already floating in the ocean."
The most basic difference is that sea ice forms from salty ocean water, whereas icebergs, glaciers, and lake ice form from fresh water or snow. Sea ice grows, forms, and melts strictly in the ocean. Glaciers are considered land ice, and icebergs are chunks of ice that break off of glaciers and fall into the ocean. Lake ice is made from fresh water and freezes as a smooth layer, unlike sea ice, which develops into various forms and shapes because of the constant turbulence of ocean water. The process by which sea ice forms is also different from that of lake or river ice. Fresh water is unlike most substances because it becomes less dense as it nears the freezing point. This difference in density explains why ice cubes float in a glass of water. Very cold, low-density fresh water stays at the surface of lakes and rivers, forming an ice layer on the top.
Reporting credit: Chavo Bart Digital Media. Photo: The Antarctic Ice Sheet covers an area larger than the U.S. and Mexico combined. This photo shows Mt. Erebus rising above the ice-covered continent. (Ted Scambos & Rob Bauer) Courtesy of the National Snow and Ice Data Center, University of Colorado, Boulder. More Resources All About Sea Ice A Tour of the Cryosphere (includes an audio version) Arctic vs. Antarctic Melt of Key Antarctic Glaciers ‘Unstoppable’ Stronger Winds Explain Puzzling Growth of Sea Ice in Antarctica Acceleration of the contribution of the Greenland and Antarctic ice sheets to sea level rise NASA Mission Takes Stock of Earth’s Melting Land Ice FILED UNDER: David Appell, land ice, sea ice, sea level rise. https://www.yaleclimateconnections.org/2014/11/loss-of-land-ice-not-sea-ice-more-sea-level-rise/
Habitat Container © 2017 | (305) 816-6635 | fax (305) 974-4332
3479 NE 163rd St, North Miami Beach, Fl, 33160 United States of America | Info@habitatcontainer.com