Chapter%205%20atmospheric%20moisture-1

Instability and stability of air in the atmosphere

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Unformatted text preview: and will continue to rise (warm air is less dense than cold air and more buoyant. (Example: rapid surface heating) Low pressure systems Clouds Clouds consist of water droplets, ice crystals, or both suspended in air. They play a temperature role both cooling and warming the Earth and atmosphere. Condensation nucleus: a tiny bit of solid matter (aerosol) in the atmosphere, on which water vapor condenses to form a tiny water droplet. Cloud particles require a tiny center of solid matter to grow around. Salt residue Dust over cities Air pollutants smoke Visualizing Physical Geography CLOUDS Clouds form when air becomes saturated aloft Warm air rises and cools resulting in condensation and cloud formation Clouds will only form above the condensation level Level at which air becomes saturated Genetic types of precipitation: Three factors necessary for precipitation to develop: 1. Moist Air 2. Condensation nuclei for which water vapor can condense on 3. Uplift mechanism that can force the air to rise and cool via adiabatic process to the dew point temperature. 4 primary ways clouds (and prec...
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