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  3. One characteristic of the El Nino is According to the model, what normally signals the disappearance of an El Nino?

One characteristic of the El Nino is According to the model, what normally signals the disappearance of an El Nino?

admin2009-04-27  76
问题 One characteristic of the El Nino is
According to the model, what normally signals the disappearance of an El Nino?
选项 A、The arrival in the eastern Pacific of negative sea-level Kelvin waves.
B、An increase in the speed at which negative Rossby waves cross the Pacific.
C、A shift in the direction of the winds produced by the start of an anti-El Nino elsewhere in the Pacific.
D、The reflection of Kelvin waves after they reach the eastern boundary of the Pacific, along Ecuador and Peru.
答案A
解析 事实细节题。文章第三段前三句指出"当罗斯比波抵达西部边界后会被反弹回来，同时模型预测罗斯比波将被分解成为许多沿海岸线的开尔文波，它们将携带同样的负海平面信号。这些波最终将涌向赤道，然后在地球自转的推动下，以每天250公里的速度沿赤道向东前进。当大量的强幅度的开尔文波从西太平洋到达时，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"。从描述的模型来看，负海平面的开尔文波到达太平洋东部，表明厄尔尼诺现象的结束，这正是答案选项的内容。
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