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One characteristic of the El Nino is It can be concluded that during an anti-El Nino the faster-moving signal waves are
One characteristic of the El Nino is It can be concluded that during an anti-El Nino the faster-moving signal waves are
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2009-04-27
91
问题
One characteristic of the El Nino is
It can be concluded that during an anti-El Nino the faster-moving signal waves are
选项
A、negative Rossby waves moving east along the equator.
B、positive Rossby waves moving west along the equator.
C、positive Kelvin waves moving east along the equator.
D、positive Kelvin waves moving west along the equator.
答案
C
解析
推理判断题。本文末段最后两句指出"当大量的强幅度的开尔文波从西太平洋达到时,它们的负海平面信号克服倾向于提高海平面的反馈机制,并且开始把这个运转体系推入相反的冷模式。这使风逐渐发生变化,最终使正海平面罗斯比波向西,这些波最终以正开尔文波形式返回,标志着寒冷周期已结束,从而开始下一个暖周期"。由此可以推论:在冷周期,正罗斯比波送向西方,通过反射,正开尔文波沿着赤道流向东方。从第二段可知罗斯比波是以每日25到85公里的速度向西部移动,而Kelvin waves则是以每日250公里沿着赤道向东部移动。可见,在冷周期,即在反厄尔尼诺(周期性海洋寒流)中,速度最快的信号波是正开尔文波,这正是答案选项内容。
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0
考研英语一
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