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This assumption is that if this heat flow has increased we see in the data that it has it has contributed to the warming in the Arctic, not only at the surface, but higher in the atmosphere, Graversen said.

Increased moisture in northwardmoving air also plays a role, he said, because when the water vapor condenses isabel marant trainers buy online into clouds and snow, it isabel marant trainers buy online releases energy, warming the air.

Nobody knows how much of this change is the result of human emissions of planetwarming gases such as carbon dioxide, but its likely that they play a role.

Many models suggest an increase in energy transport when more greenhouse gases are introduced into them, he said.

Changes in the circulation in the atmosphere might have had a much larger effect than previously thought, but these changes may also have been induced by greenhouse gases.

The new finding doesnt downplay the effects of declining snow and ice. In fact, the scientists wrote, solar heating of denuded landscapes might become increasingly important as ice continues to retreat.

Thats an important message, said John Walsh, Presidents Professor of Global Climate Change at the International Arctic Research Center for the University of Alaska, Fairbanks, who was not involved in the study.

Were it not for this increase in poleward heat transport, the Arctic might have warmed less and the middle latitudes might have warmed more than actually happened over the past several decades, he said via email. isabel marant trainers buy online

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