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SSS 2010-04-28

时间:2010-06-11 02:39来源:互联网 提供网友:swalloer   字体: [ ]
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If you've ever driven up to a mountain pass, you know that the higher you climb, the colder it gets. But on clear, calm days, it can actually (be) colder in the valleys. That's because under high-pressure systems, cold air slides down mountain slopes and pools down below. In the Oregon Cascades1, ridgeline temperatures have clocked in at 27 degrees Fahrenheit2 warmer than those in a valley 2,600 feet below.

So what happens when you take this variability and subject it to climate change? Well, a moderate estimate from the IPCC says western Oregon could warm 5 degrees Fahrenheit over the next century. But that's probably more accurate for the valleys—ridgetop temperatures could rise as much as 14 degrees, according to research in the International Journal of Climatology.

Oregon is projected to have more high-pressure days as the climate changes. That means more cold air pooling in the valleys and more extreme temperature differences, which could disrupt the local ecosystem3.

We tend to think of climate change as a global or regional phenomenon. But, as this research suggests, you have to also think locally.

Thanks for the minute for Scientific American's 60-Second Science. I'm Christopher Intagliata.
 


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1 cascades 6a84598b241e2c2051459650eb88013f     
倾泻( cascade的名词复数 ); 小瀑布(尤指一连串瀑布中的一支); 瀑布状物; 倾泻(或涌出)的东西
参考例句:
  • The river fell in a series of cascades down towards the lake. 河形成阶梯状瀑布泻入湖中。
  • Turning into the sun, he began the long, winding drive through the Cascades. 现在他朝着太阳驶去,开始了穿越喀斯喀特山脉的漫长而曲折的路程。 来自英汉文学 - 廊桥遗梦
2 Fahrenheit hlhx9     
n./adj.华氏温度;华氏温度计(的)
参考例句:
  • He was asked for the boiling point of water in Fahrenheit.他被问到水的沸点是华氏多少度。
  • The thermometer reads 80 degrees Fahrenheit.寒暑表指出华氏80度。
3 ecosystem Wq4xz     
n.生态系统
参考例句:
  • This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
  • We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
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