新概念英語第四冊（美音版）The Butterfly Effect

Lesson 14
The Butterfly Effect
蝴蝶效應(yīng)
First listen and then answer the following question.
聽錄音，然后回答以下問題。
Why do small errors make it impossible to predict the weather system with a high degree of accuracy?
Beyond two or three days, the world's best weather forecasts are speculative, and beyond six or seven they are worthless.
The Butterfly Effect is the reason. For small pieces of weather -- and to a global forecaster, small can mean thunderstorms and blizzards -- any prediction deteriorates rapidly. Errors and uncertainties multiply, cascading upward through a chain of turbulent features, from dust devils and squalls up to continent-size eddies that only satellites can see.
The modern weather models work with a grid of points of the order of sixty miles apart, and even so, some starting data has to guessed, since ground stations and satellites cannot see everywhere. But suppose the earth could be covered with sensors spaced one foot apart, rising at one-foot intervals all the way to the top of the atmosphere. Suppose every sensor gives perfectly accurate readings of temperature, pressure, humidity, and any other quantity a meteorologist would want. Precisely at noon an infinitely powerful computer takes all the data and calculates what will happen at each point at 12.01, then 1202, then 12.03...
The computer will still be unable to predict whether Princeton, New Jersey, will have sun or rain on a day one month away. At noon the spaces between the sensors will hide fluctuations that the computer will not know about, tiny deviations from the average. By 12.01, those fluctuations will already have created small errors one foot away. Soon the errors will have multiplied to the ten-foot scale, and so on up to the size of the globe.
JAMES GLEICK, Chaos
New words and expressions 生詞和短語
forecast
n. 預(yù)報
speculative
adj. 推測的
blizzard
n. 暴風(fēng)雪
deteriorate
v. 變壞
multiply
v. 增加
cascade
v. 瀑布似地落下
turbulent
adj. 狂暴的
dust devil
小塵暴，塵旋風(fēng)
squall
n. 暴風(fēng)
eddy
n. 旋渦
grid
n. 坐標(biāo)方格
sensor
n. 傳感器
humidity
n. 溫度
meteorologist
n. 氣象學(xué)家
Princeton
n. 普林斯頓（美國城市名）
New Jersey
n. 新澤西（美國州名）
fluctuation
n. 起伏，波動
deviation
n. 偏差