In this chapter, you studied the
evaporation of water from the earth's surface (primarily its oceans)
into the atmosphere and then its condensation or deposition within
the atmosphere as cloud particles-many of which have nuclei of
sea salt. In the process, you learned how to solve a variety of
problems relating temperature, relative humidity, dew point, wet-bulb
temperature, and mixing ratio. You saw that relative humidity
is a measure of how much water exists in vapor form compared to
the equilibrium or saturation value. You saw that relative humidity
is highly sensitive to temperature changes. You also considered
the geographic and temporal variations of humidity, both absolute
and relative, and some ways humidity affects the human body.
The chapter continued with a discussion of condensation as dew
and frost and (more important for our purposes) in the free atmosphere,
onto condensation and freezing nuclei. Such condensation and deposition
are the genesis of cloud particles. You learned that a cloud droplet's
diameter and the amount of impurity within its water mass can
influence the efficacy with which the water vapor condenses onto
the drop, hence its rate of growth. Finally, you explored the
formation of frozen cloud particles and the process of supercooling,
a common atmospheric phenomenon.
Simulation 1 (3078.0K) |