城市可影响到千里之外地区的气温-凯发k8官网

城市可影响到千里之外地区的气温
文章来源:未知 文章作者:enread 发布时间:2013-01-28 06:21 字体: [ ] 
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even if you live more than 1,000 miles from the nearest large city, it could be affecting your weather. in a new study that shows the extent to which human activities are influencing the atmosphere, scientists have concluded that the heat generated by everyday activities in 1(大都市的) areas alters the character of the jet stream and other major 2 systems. this affects temperatures across thousands of miles, significantly warming some areas and cooling others, according to the study this week in nature climate change.
 
the extra "waste heat" generated from buildings, cars, and other sources in major northern hemisphere urban areas causes winter warming across large areas of northern north america and northern asia. temperatures in some remote areas increase by as much as 1 degree 3 (1.8 degrees fahrenheit), according to the research by scientists at the scripps institution of oceanography; university of california, san diego; florida state university; and the national center for atmospheric research.
 
at the same time, the changes to atmospheric circulation caused by the waste heat cool areas of europe by as much as 1 degree c (1.8 degrees f), with much of the temperature decrease occurring in the fall.
 
the net effect on global mean temperatures is nearly negligible -- an average increase worldwide of just 0.01 degrees c (about 0.02 degrees f). this is because the total human-produced waste heat is only about 0.3 percent of the heat transported across higher 4 by atmospheric and oceanic circulations.
 
however, the noticeable impact on regional temperatures may explain why some regions are experiencing more winter warming than projected by climate computer models, the researchers conclude. they suggest that models be adjusted to take the influence of waste heat into account.
 
"the burning of fossil fuel not only emits greenhouse gases but also directly affects temperatures because of heat that escapes from sources like buildings and cars," says ncar scientist aixue hu, a co-author of the study. "although much of this waste heat is concentrated in large cities, it can change atmospheric patterns in a way that raises or lowers temperatures across considerable distances."


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1 mcyxz     
adj.大城市的,大都会的
参考例句:
  • metropolitan buildings become taller than ever.大城市的建筑变得比以前更高。
  • metropolitan residents are used to fast rhythm.大都市的居民习惯于快节奏。
2 6eayr     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
3 axrzl     
adj.摄氏温度计的,摄氏的
参考例句:
  • the temperature tonight will fall to seven degrees celsius.今晚气温将下降到七摄氏度。
  • the maximum temperature in july may be 36 degrees celsius.七月份最高温度可能达到36摄氏度。
4 90df39afd31b3508eb257043703bc0f3     
纬度
参考例句:
  • latitudes are the lines that go from east to west. 纬线是从东到西的线。
  • it was the brief indian summer of the high latitudes. 这是高纬度地方的那种短暂的晚秋。
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