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  3. One characteristic of the El Nino is Which of the following would most seriously undermine the validity of the model of El Nino

One characteristic of the El Nino is Which of the following would most seriously undermine the validity of the model of El Nino

admin2009-04-27  97
问题 One characteristic of the El Nino is
Which of the following would most seriously undermine the validity of the model of El Nino mentioned?
选项 A、During some years El Nino extends significantly farther along the coasts of Ecuador and Peru than during other years.
B、During periods of unusually cool temperature along the eastern Pacific, an El Nino is much colder than normal.
C、The variations in the time it takes Rossby waves to cross the Pacific depend on the power of the winds that the waves encounter.
D、The western boundary of the Pacific basin is so irregular that it hinders most coastal Kelvin waves from heading eastward.
答案D
解析 事实细节题。文章第二段末句指出"数月以后，罗斯比波穿越太平洋到达太平洋盆地的西部边界。在模型中这个边界是一堵平滑的墙，而实际上却由很不规则的群岛构成，如菲律宾群岛和印度尼西亚群岛"。此外，第三段首句指出"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"。由此可知，太平洋盆地的西部边界极不规则，而模型的边界是平滑的墙，不规则边界会阻止大多数携带负海平面信号的卡尔文波向东前进，这一点不同降低了厄尔尼诺数学模型的效度，故选为本题正确答案。
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