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Chapter 5 Answers to Review Questions

Chapter 5 Answers to Review Questions - Chapter 5 Answers...

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Chapter 5 Answers to Questions for Review 1. A process in which an air parcel expands and cools, or compresses and warms, with no interchange of heat with its surroundings. 2. By comparing the air temperatures at two different altitudes. 3. During a moist adiabatic process the heat added during condensation offsets some of the cooling due to expansion, so the air no longer cools at the dry adiabatic rate but at a lesser rate called the moist adiabatic rate. 4. The atmosphere tends to become more stable as the air aloft warms or the surface air cools. If the air aloft is being replaced by warmer air (warm advection), and the surface air is not changing appreciably, the environmental lapse rate decreases and the air becomes stable. Similarly, if the surface air cools and the aloft air temperature remains relatively constant, the air becomes more stable. The atmosphere becomes more unstable as the environmental lapse rate steepens; that is, as the air temperature drops rapidly with increasing height. 5. Conditional instability means that if the atmosphere is unsaturated it is stable, but if it is saturated it is unstable. Saturation. 6. Because during an inversion the environmental lapse rate is not only small, it's negative. 7. Stable: stratus and nimbostratus. Unstable: vertical development clouds.
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