The retreat of snow and ice accelerates warming twice as strong

Reduction in the area of snow and ice on the surface of the Earth affects the increase in temperature of the planet is two times stronger than previously thought, according to the publication Christian Science Monitor, citing a study by American scientists.

"Over the past 30 years, the so-called cooling capacity cryosphere — the earth's surface covered with snow and ice — is reduced to two times faster than the predicted global climate models," — says the publication.

Melting of snow and ice — one example of the so-called "positive feedback" when the two processes are mutually reinforcing. Reduction in the area of ice and snow, highly reflective solar radiation leads to an increase in surface temperature, which in turn leads to faster melting.

A team led by climatologist Mark Flanery (Mark Flanner) from the University of Michigan (USA) decided to check how accurately existing climate models include the effect of reducing the cryosphere to increase the Earth's temperature.

Using satellite data and indicators of field research on the state of the snow and ice cover in the northern part of New Hampshire (USA), climate model were seasonal changes of surface reflectance in the region.

"Measured decrease the cooling effect of" compression "Cryosphere northern New Hampshire implies an increase in temperature in the region of one degree Celsius, which is two times higher than predicted by climate models," — say climatologists.

According to the scientists, the Arctic, and next to it is the northern New Hampshire, "warmer" than the Antarctic, so the slightest change in temperature, it has a much stronger impact on the snow and ice.

"The sea ice in the Arctic, the most" effective "(increased reflectivity) in June, before the summer melt. If the melting starts earlier, you will observe the daily decrease in the reflectivity of the region during the summer," — says one of the participants of Don P. ( Don Perovich).

Arctic sea ice plays an important role in Earth's climate system. On the one hand, he — an indicator of global warming, on the other — the processes occurring in the Arctic affect the ecology of the Earth.

Experts from the World Wildlife Fund (WWF) predict that the melting of ice at the end of the 21st century the oceans will rise by more than a meter.

Because of this, the report said the fund "Influence of Arctic climate: the global impact", changing ocean currents in the world, and behind them — and climatic characteristics, including in North America and Europe. This, according to scientists, will inevitably lead to problems with the local flora and fauna, agriculture and water.

Source: http://eco.rian.ru/discovery/20110119/323627952.html

Like this post? Please share to your friends: