Lecture 13 F 2010

Lecture 13 F 2010 - Lecture 13 Outline Notes In the...

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Lecture 13 Outline Notes In the previous class, we looked at high pressure and low pressure in the context of influencing wind and wind direction. We will now look at high and low pressure in slightly more detail, and see how differences in air pressure across the planet are responsible for global-scale atmospheric circulation. Low Pressure Low pressure areas have ______________ air at the surface that ____________. Air ___________ at the surface when a particularly warm, low pressure spot develops. Slight cooler (slightly higher-pressure) air will move towards (converge upon) the lower pressure area……because High Pressure The high pressure areas have ______________air that ___________ at the surface as the weight of the air mass forces air to move outward (diverge). Air can be descending from: There are huge areas on the globe that are characterized by high or low pressure. Wind systems have developed around these areas. The four main pressure areas transfer energy from the equator towards the poles are: 1. Equatorial Low-Pressure Trough – ITCZ 2. Sub-tropical High-Pressure Cells 3. Polar high-Pressure Cells 4. Subpolar Low-Pressure Cells Their corresponding winds are: 1. Trades 2. Westerlies 3. Polar easterlies
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1. Intertropical Convergence Zone (ITCZ) (aka Equatorial Low-Pressure Trough) Occurs in the tropics between __________________ north and south latitude. It forms due to the _____________________________________________ of this area, which creates a trough of low pressure (light, less-dense, ascending air). Surface winds (_____________) converge along the extent of the trough. This converging air is extremely moist and full of latent heat energy. __________________________ are common as air expands, cools and condenses. Vertical cloud columns frequently reach the tropopause, in thunderous strength and intensity. Within the ITCZ, the winds are ______ or mildly variable, because of the even pressure gradient and the vertical ascent of air. These equatorial calms are called the ______________ because of the difficulty sailing ships experienced in this zone. The ITCZ shifts north and south during the year, corresponding with the shifting of the ____________
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Lecture 13 F 2010 - Lecture 13 Outline Notes In the...

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