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variation

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El Niño-Southern Oscillation

Under average conditions the trade winds blow from east to west across the tropical Pacific. This allows warm water to pile up in the western Pacific while upwelling of colder water occurs in the eastern Pacific.

Under average conditions the trade winds blow from east to west across the tropical Pacific. This allows warm water to pile up in the western Pacific while upwelling of colder water occurs in the eastern Pacific.

&&

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m8+'1"$,n&•! steep slopes

typically drain well, leading to xeric conditions

•! bottomlands moist supporting riparian forests, even in arid lands

•! in N hemisphere, south-facing slopes are warmer and drier than north-facing slopes

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•! Global climate –! differential input of solar irradiation –! in different regions and –! redistribution of energy by winds and ocean currents.

•! Seasonality –! latitudinal movement of the solar equator.

•! El Niño-Southern Oscillation •! Topography •! Soil