TPO64听力Lecture2原文+MP3+题目+答案下载

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TPO64听力Lecture2原文+MP3+题目+答案下载

TPO64听力Lecture2原文：

Listen to part of a lecture in an Earth science class.

As you know from your reading, an air mass is, it’s a large body of air that’s got uniform properties in terms of temperature and moisture. There are four types of air masses and the one we’ll concentrate on today is the continental polar air mass. Continental polar air masses originate, form over a continent near the poles, over areas that are typically cold and dry, and it’s the polar air masses from the Artic and northern Canada that largely influence weather patterns in the United States, especially in the eastern, east of the Rocky Mountains.

Now, these continental polar air masses are not generally associated with heavy precipitation. In fact, since they generally remain dry and cold throughout their track across North America, they bring the mostly clear skies and cooler temperatures we see throughout most of the eastern United States during the winter months.

However, when a polar air mass sweeps across the Great Lakes Region in late autumn and winter, it can bring extremely heavy snowfalls to that region. We refer to these snow storms as “lake-effect snows”, snows whose moisture comes from the Great Lakes themselves.

Let me explain how this happens. But first, here’s a map of the region. You see Rochester on the southern shore of Lake Ontario and Buffalo on the far eastern shore of Lake Erie, these two cities are among the snowiest city in America, thanks largely to the lake effect. Over one recent 10 years period, Rochester and Buffalo each received like 27 meters of snow. It’s nearly 90 feet.

Okay, let’s turn to the other pair of cities on this map: Thunder Bay and Marquette. As you can see, they’re both on the shore of Lake Superior but Marquette consistently gets two to three times more snow than Thunder Bay. Why?

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TPO64听力Lecture2题目：

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