When El Nino reaches a place, the temperature there would change a great deal.A．YB．NC．NG

When El Nino reaches a place, the temperature there would change a great deal.

A．Y

B．N

C．NG

答案

查看答案

发布时间：2021-11-23

更多“When El Nino reaches a place, the temperature there would change a great deal.A．YB．NC．NG”相关的问题

第1题

El Nino is a disturbance of the world's normal climate pattern. During El Nino events, the

westerly trade winds become slower and the warmer water in the western Pacific moves towards South America. This huge increase in ocean temperatures—as much as eight degrees centigrade—and the change in atmospheric conditions bring rain to the deserts of South America and the rainforests of south-east Asia, with drought conditions throughout eastern and southern Africa. There are many knock-on effects all over the world.

The home of El Nino is Peru. El Nino, "the Christ Child", was first named by Peruvian fishermen one Christmas when they noticed unusual warm currents affecting the Pacific coast of South America. Up and down the county, from desert to highlands, El Nino weather phenomena have brought destructive floods, costing $ 200 million in immediate and long-term damage, and undoing the work of many development projects.

"The destruction is near total," Dominic Brain, a worker for Christian Aid reported. "Few of the houses could withstand the floodwater. Today I visited Acomayo, a shantytown(贫民区) where 17,500 people once live. Now only ten percent of the houses are still standing. The bulk of the population has lost all their possessions."

The town of Ica seldom sees rain. Houses for the poor are built of adobe—sun-baked mud—standing side by side in long terraces. When the River Ica burst its banks in late January, 15,000 houses were swiftly flooded. Up to 5,000 houses were destroyed—a sign not only of the force of the river, which loosened huge rocks and swept them falling down from the Andean mountains, but of the vulnerability of the homes which hardly ever face rain. "They melted like chocolate," exclaimed an eye-witness. "The extent of the damage was terrible!"

Almost immediately health became a problem. Without proper plumbing(排水), waste matter rose to the surface of the floodwaters. People received cuts walking through the floodwater and mud. Cholera—epidemic in Peru in the early nineties—returned, with 90 reported eases in Ica province alone. The entire city seems to have drowned—first in floodwaters 1.5 meters high, and then in mud. Sadly, three people lost their lives, sucked into the floodwaters, but it was a miracle that there were not more casualties(伤亡者).

El Nino is a warm ocean current______.

A．which centers on America and Africa

B．which was named by an American

C．which kills many people every time

D．which has side-effects all over the world

点击查看答案

第2题

What is an El NinoAn El Nino is a temporary change in the climate of the Pacific Ocean, in

What is an El Nino

An El Nino is a temporary change in the climate of the Pacific Ocean, in the region around the equator. You can see its effects in both the ocean and atmosphere, generally in Northern Hemisphere winter. Typically, the ocean surface warms up by a few degrees Celsius. At the same time, the place where strong thunderstorms occur on the equator moves eastward. Although those might seem like small differences, it nevertheless can. have big effects on the world's climate.

What muses it？

Usually, the wind blows strongly from east to west along the equator in the Pacific. This actually piles up water (about half a meter's worth) in the western part of the Pacific. In the eastern part, deeper water (which is colder than the sunwarned surface water) gets pulled up from below to replace the water pushed west. So, the normal situation is warm water (about 30 ℃; ) in the west, cold (about 22℃ ) in the east. In an El Nine, the winds pushing that water around get weaker. As a result, some of the warm water piled up in the west slumps hack down to the east, and not as much cold water gets pulled up from below. Both these tend to make the water in the eastern Pacific warmer, which is one of the signs of an El Nine. But it doesn't stop there. The warmer ocean then affects the windsit makes the winds weaker! So if the winds get weaker, then the ocean gets warmer, which makes the winds get weaker, which makes the ocean get warmer... This is called a positive feedback, and is what makes an El Nino grow.

So what makes it stop growing？

The ocean is full of waves, but you might not know how many kinds of waves there are. There's one called a Rossby wave that is quite unlike the waves you see when you visit the beach. It is more like a distant cousin to a tidal wave. The difference is that a tidal wave goes very quickly, with all the water moving pretty much in the same direction. In a Rossby wave, the upper part of the ocean, say the top 100 meters or so, will be leisurely sliding one way, while the lower part, starting at 100 meters and going on down, will be slowly moving the other way. After a while they switch directions. Everything happens very slowly and inside the ocean, and you can't even see them on the surface. These things are so slow; they can take months or years to cross the oceans. If you had the patience to sit there while one was going by, you'd hardly notice it; the water would be moving 100 times slower than walking speed. But they are large, hundreds or thousands of kilometers in length (Not height! Remember, you can hardly see them on the surface), so they can have an effect on things. Another wave you rarely hear about is called a Kelvin wave, and it had some characteristics in common with Rosaby waves, but is somewhat faster and can only exist closer to the equator (say, within about 5 degrees of latitude around the equator).

El Ninos often start with a Kelvin wave spreading from the western Pacific over towards South America. Perhaps you saw, on the TV news, the movie (produced by JPL) for the El Nine of 1997/98？ It showed a whitish blob(白色团状物) (indicating a sea level some centimeters higher than usual) moving along the equator from Australia to South America. That is one of the hallmarks of a Kelvin wave, the early part of the El Nino process.

When an El Nino gets going in the middle or eastern part of the Pacific, it creates Rossby waves that drift slowly towards Southeast Asia. After several months of traveling, they finally get near the coast and reflect back. The changes in interior ocean temperature that these waves carry with it "cancel out" the original temperature changes that made the El Nino in the first place. The main point is that it shuts off when these funny interiorocean waves travel all the way ever to the coast of Asia, get reflected, and travel hack, a process that can take many months.

What effects does i

A．Y

B．N

C．NG

点击查看答案

第3题

What's the best title for this passage？A．El NinoB．How Does El Nino HappenC．What Is El Nino

What's the best title for this passage？

A．El Nino

B．How Does El Nino Happen

C．What Is El Nino

D．The Effects of El Nino