Chapter07a - Precipitation I RECAP Moistureintheair(...

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Precipitation I
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RECAP Moisture  in the air (different types of humidity). Condensation  and  evaporation  in the air (dew point). Stability  of the atmosphere: determines the type of clouds  Cloud formation:  moist air rises up in the atmosphere where it expands  adiabatically, cools down, saturates and  forms clouds. Chapter 7:  precipitation.  Any form of water (liquid or solid) that falls 
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From droplets to raindrops Typical sizes (diameter) Condensation nuclei: 0.2  μ m Cloud droplet: 20  μ m Raindrop: 2000  μ m The cloud droplets need to grow in order to become raindrops! Growth is determined by the balance of  condensation (C) and evaporation (E) C>E the droplet grows C<E the droplet gets smaller C=E the droplet stays the same (in equilibrium), hence: Saturation (equilibrium) vapor pressure
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The growth of cloud droplets Curvature   effect:  The saturation water vapor pressure depends on the  curvature  of the water surface. The larger the curvature the easier it is for the water molecules to leave the  surface of the liquid water.  The  saturation vapor pressure  for small droplets is higher therefore they  require more vapor to keep their size
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Chapter07a - Precipitation I RECAP Moistureintheair(...

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