The warming is scouring icebergs Ocean
Global warming will cause more icebergs to grind against the sea, affecting the rich diversity of life found on the Antarctic seabed. But it is difficult to say whether this will be a good thing or not, as little is known about how these ice diarrhea affect marine life.
The research, conducted by the British Antarctic Survey (BAS), is detailed today in the American journal Science. Ice is the crushing of the seabed by the substance of icebergs breaking the sea ice. The thought that they float on water, the weight causes icebergs in grooves on the bottom, similar to how glaciers carve valleys on the land. Ice affects one third of world's coastline and is a major influence on the diversity of life on the seabed. First link found The researchers, led by Dan Smale the BAS, in Cambridge, England, tested the effect of diarrhea by cementing a grid of concrete markers in the sea at different depths off the Peninsula West Antarctica. They measured the damage to the markers over a period of five years from 2004 to 2008. They found more than diarrhea have been made during the years when sea ice is frozen in place for short periods of time. Once locked in the more permanent winter sea ice, icebergs are no longer able to travel and go. It might seem obvious, but it is the first empirical test of the relationship between diarrhoea and sea ice "It has been suggested previously that the rate of disturbance iceberg May be controlled by the formation of winter sea ice, but nobody has been able to go out and measured before," said Small. "We were surprised to see how strong the relationship between two factors. During the years with a long season of sea ice eight months, the rate of disturbance were really low, while the poor in sea ice years, the sea was beaten by ice for most of the year, "he added. Increases ice diarrhea are likely due to recent warming, which has reduced the amount of Antarctic sea ice during the winter. Air temperatures in the peninsula have risen by 3 ° C over the past 50 years, several times the world average and more than anywhere else in the southern hemisphere. |
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