The growth temperature and the warm waters of the Atlantic are destroying Arctic ice. So quickly over the past 1450 years, the Arctic is not melting, scientists say.
A team led by Christophe Kinnard (Christophe Kinnard) revealed how the Arctic climate over the past 1450 years. It turned out that this ice melting, which is happening now, was not observed during this time. This conclusion the authors made the analysis of ice cores, sediments, and they are also used dendrochronological method.
Arctic melts really fast. Since the late twentieth century the area of Arctic sea ice has decreased more than two million square kilometers. Thus now prevail in the Arctic first-year ice, which melts in the summer, and in winter are formed anew. The main reason for these dramatic changes — the inflow of warm water from the Atlantic.
Reduction of sea ice in the Arctic — a fact. The question arises that scientists completely different — there are now short-period variations in the Arctic climate, that is, it means that the melting will be over soon, or are we witnessing a unidirectional long process. This question is difficult to answer because of the short time period of observation: historical data on the state of the ice cover in the Arctic, there are no more than a hundred years, and direct instrumental observations are not more than 40 years.
"The short period of observation of the Arctic ice complicates our understanding of how the system is stable at all, and whether or not it is subject to certain natural variations. So you need a longer period of observation to place modern changes in this context ", — said Kinnard.
XVI century is similar to the XX
Researchers concluded that the shrinking of the ice in the Arctic, like the modern, occurred in the 16th century. Then came the little colder, and the ice began to grow, and in the late 90's melting has accelerated markedly. According to Kinnard, over the past twenty years, the ice began to melt faster. Scientists see the reason for this in human activity and greenhouse gas emissions that lead to global warming. This increases the temperature of the air, and in the Arctic, it is faster than the rest of the globe. On the other hand, the hot waters of the North Atlantic, and when they get into the Arctic basin, the ice begin to break down.
Article Kinnard and his colleagues published in the journal Nature.