北美的气候（North American climate）.doc

北美的气候（North American climate） The influence of topography on the climate in the United States: North American terrain is divided into West and East three longitudinal belt, West Mountain, Central Plains, Eastern plateau. A, western mountains: hinder the exchange, eastern air masses in the winter, the Cordillera mountains towering along the Pacific North and South longitudinal extension, prevent the polar air mass Pacific East, while preventing the influence of polar continental air mass on the west coast; summer, hindered the influence of tropical marine air mass formation from the eastern coast of the Atlantic on the West coast. In addition, because of the parallel distribution of mountains and coastlines, the climate types along the Pacific coast are narrow and narrow, which restricts their distribution. Two, the Central Plains: temperature, precipitation, seasonal changes, the mainland is stronger. North Central Plains, North and south open, winter cold air coming from north to south in sudden cooling. Tropical heating pipes from the Gulf of Mexico are free to go northward in the summer. The weather is muggy and rainy. So America temperature increases, the characteristics of the North American climate intensified. Three, the eastern highlands Dihuan area: winter cold northwest wind can affect the east coast, from the summer warm air over the Atlantic also enters the Inland highlands. But because of the presence of the Appalachian Mountains in the East, the water vapor from the Atlantic has been blocked, making the windward slopes snowy in winter and rainy in summer. To sum up, the unique terrain of North America forms its unique climate. 2. analyses the effects of topographic factors on climate formation in North america. Answer: the topography characteristics of North America is what high school low three columns with the north and south, for different continental climate is particularly important. Its influence is reflected in the following three aspects: 1, th