Exam 17: Earths Changing Climate

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Discuss the climatic controls that produce the marked seasonal variation in precipitation in areas such as India and Southeast Asia.

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In many areas (especially within India and Southeast Asia),the marked variation in precipitation is associated with the monsoon-the seasonal reversal of winds.The Asian monsoon circulation is due in part to differential heating between landmasses and oceans.During winter in the Northern Hemisphere,winds blow outward,away from a cold,shallow high-pressure area centered over continental Siberia.These downslope,relatively dry northeasterly winds from the interior provide India and Southeast Asia with generally fair weather and the dry season.In summer,the wind-flow pattern reverses as air flows into a developing thermal low over the continental interior.Humid air from the water rises and condenses,resulting in heavy rain and the wet season.

What is indicated by the fact that isotherms are oriented east-west on global temperature maps?

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B

Discuss the general winter and summer precipitation patterns of polar regions.​

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In the cold air of the polar regions there is little moisture,so there is little precipitation.Winter storms drop light,powdery snow that remains on the ground for a long time because of the low evaporation rates.In summer,a ridge of high pressure tends to block storm systems that would otherwise travel into the area;hence,precipitation in polar regions is meager in all seasons.

At low elevations near the equator,high temperatures and abundant yearly rainfall combine to produce a dense,broadleaf,evergreen forest called a ____________________.

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According to the ancient Greeks,a middle-latitude ____ zone has a distinct summer and winter,so it exhibits characteristics of both extremes.

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Precipitation is most abundant ____.

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When the average temperature for every month drops below freezing,plant growth is impossible,and the region is perpetually covered with snow and ice,the climate is classified as ____.

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The leeward side of mountains tends to be ____.

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Classifying a climate as dry depends not only on precipitation totals but also on ____________________,which greatly influences evaporation.

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Landmasses heat up and cool off more quickly than do large bodies of water.

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Köppen's scheme employs ____ major climatic types,with each type designated by a capital letter.

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Thornthwaite developed a P/E ratio,which is essentially monthly precipitation divided by monthly ____________________.

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Explain how Köppen divided dry climates into categories,and characterize each of the primary dry categories.

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In which of Köppen's climatic types are the average temperatures of the coldest month below 18°C (64°F)and above -3°C (27°F)?

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In tropical regions,the trade winds converge along the Intertropical Convergence Zone (ITCZ),producing sinking air masses.

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Across much of the United States,intense winter storms develop and travel ____________________,frequently dumping heavy precipitation as they go.

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The relatively dry air and the Antarctic's high elevation permit rapid ____________________ during the dark winter months,producing extremely cold surface air.

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Using the P/E index,the Thornthwaite system defines ____ major humidity provinces and their characteristic vegetation.

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A region on the leeward side of a mountain where precipitation is noticeably less is called a ____________________.

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The climate of a large state or a small nation is called the ____________________.

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