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SSS 2009-07-02

时间:2010-05-18 03:06来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science, I'm Christie Nicholson. Got a minute?

If you’ve spoken to anyone in New York City, where Scientific American’s offices are, then you’ve heard about the rain, every day since mid-June. Still, we’re not in the intertropical convergence zone, an area just north of the equator stretching across the Pacific that builds rain clouds 30,000 feet thick, releasing as much as 13 feet of rain annually1. But the rainiest place on Earth might reach us, eventually. Researchers report in the journal Nature Geoscience, the zone is moving north at a rate of nearly a mile per year. And it’s important because it supplies freshwater to a billion people in the tropics. Researchers studied Washington Island in the Pacific that gets 10 feet of rain annually. Core samples revealed that it was desert-like only 400 years ago. A similar situation was found in Palau, now in the heart of the convergence zone. Also, the now arid2 Galapagos Islands had a very wet climate about 400 years ago. Researchers predict that the zone will be more than 75 miles north of its current position as early as mid-century, having profound and economic cultural implications for those who currently depend on it.

 

Thanks for the minute for Scientific American's 60-Sceond Science. I'm Christie Nicholson.

 


点击收听单词发音收听单词发音  

1 annually VzYzNO     
adv.一年一次,每年
参考例句:
  • Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
  • They celebrate their wedding anniversary annually.他们每年庆祝一番结婚纪念日。
2 arid JejyB     
adj.干旱的;(土地)贫瘠的
参考例句:
  • These trees will shield off arid winds and protect the fields.这些树能挡住旱风,保护农田。
  • There are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。
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TAG标签:   SSS  convergence
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