Read e-book online A great aridness : climate change and the future of the PDF

By William deBuys

ISBN-10: 0199778922

ISBN-13: 9780199778928

ISBN-10: 0199974675

ISBN-13: 9780199974672

With its hovering azure sky and stark landscapes, the yankee Southwest is without doubt one of the so much hauntingly attractive areas on the earth. but outstanding inhabitants development, mixed with the intensifying results of weather switch, is using the oasis-based society just about the edge of a Dust-Bowl-scale catastrophe.

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Keeling’s findings led the National Science Foundation to issue its first warnings on global warming, which were delivered to President Lyndon Johnson in 1963. Increased CO2 in the atmosphere, the NSF said, would reduce the amount of solar energy Earth re-radiates back into space. Unable to give off as much heat as it used to, Earth would gradually warm. Among the processes presumed to arise from the steady heating of Earth, one of the most widely accepted holds that the Hadley cells of both hemispheres will expand.

In any case, southwesterners who are curious about their climate can glimpse its future in the simplest of ways: they can look south. if you ask Richard Seager, an oceanographer at the Lamont-Doherty Earth Observatory in Palisades, New York, is that the Northern Hemisphere Hadley cell is not expanding as fast as some recent analyses have warned. Those projections, he says, depend upon THE GOOD NEWS, High Blue: The Great Downshift of Dryness 23 comprehensive satellite data, which have been available only since the late 1970s, a brief slice of time.

Shedding their moisture, the air masses of the tropics rise until they can rise no more (they bump against the bottom of the stratosphere, but that’s another story), then take their heat poleward: north in the Northern Hemisphere, south in the Southern. THE ARIDITY OF High Blue: The Great Downshift of Dryness 19 Ocean currents also carry tropical heat to higher latitudes. Roughly half of the tropics’ export of heat is transmitted via the oceans, the other half by air. The air that rises from the equatorial regions eventually cools enough to descend, and its descent defines the lands on the poleward side of the tropics in both hemispheres.

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A great aridness : climate change and the future of the American southwest by William deBuys

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