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Published: Friday 06 September, 2013

canada goose coat women canada goose coat women Does New Yorks urban heat remotely warm Canadian winters and cool fall in Europe

WASHINGTON Heat rising up from cities such as New York, Paris and Tokyo might be remotely warming up winters far away in some rural parts of Alaska, Canada, and Siberia, a surprising study theorizes.

In an unusual twist, that same urban heat from buildings and cars may be slightly cooling the autumns in much of the Western United States, Eastern Europe and the Mediterranean, according to the study published Sunday in the scientific journal Nature Climate Change.

Meteorologists long have known that cities are canada goose coat women warmer than rural areas, with the heat of buildings and cars, along with asphalt and roofs that absorb heat. Thats called the urban heat island effect and its long been thought that the heat stayed close to the cities.

But the study, based on a computer model and the Northern Hemisphere, now suggests the heat does something else, albeit indirectly. It travels about half a mile 800 metres up into the air and then its energy changes the highaltitude currents in the atmosphere that dictate prevailing weather.

Basically, it changes the flow. said Guang Zhang of the Scripps Institution of Oceanography in La Jolla, California. He wrote the paper with Aixue canada goose coat women Hu at the National Center for Atmospheric Research in Boulder, Colorado.

This doesnt change overall global temperature canada goose coat women averages significantly, unlike manmade greenhouse gases that cause global warming. Instead it redistributes some of the heat, the scientists said.

The changes seem to vary with the seasons and by region because of the way air currents flow at different times of the year. During the winter, the jet stream is altered and weakened, keeping cold air closer to the Arctic Circle and from dipping down as sharply, Hu explained.

The computer model showed that parts of Siberia and northwestern Canada may get, on average, an extra 1.4 degrees to 1.8 degrees Fahrenheit 0.8 to 1 degree Celsius during the winter, which may not be a bad thing, Zhang said. The effect isnt quite as much in northern North Dakota and Minnesota, where temperatures might be about half a degree warmer 0.3 degrees Celsius, and even less along the East Coast.

The biggest cooling occurs in the fall, but Hu said hes not quite sure why that happens.

Several outside scientists said they were surprised by the study results, calling the work intriguing and clever. But they said it would have to be shown in more than one computer model and in repeated experiments before they could accept this theory.

Its an interesting and rationally carried out study, said David Parker, climate monitoring chief of the United Kingdom meteorology office. We must be cautious until other models are used to test their hypothesis. canada goose coat women

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