Science-Weather:
Weather is an all-encompassing term used to
describe all of the many and varied phenomena
that can occur in the atmosphere of a planet.
The term is normally taken to mean the activity
of these phenomena over short periods of time,
usually no more than a few days in length. Average
atmospheric conditions over significantly longer
periods are known as climate. Usage of the two
terms often overlaps and the concepts are obviously
very closely related.
Weather happens because different areas of a
planet receive differing amounts of energy from
the Sun. Because of a planet's curvature, sunlight
is incident at different angles at different
latitudes (higher latitude -> lower angle
of incidence -> less heating). See how directness
of sunlight causes warmer weather. Different
types of surface (e.g. ocean, forest, ice) have
different properties of reflectivity (albedo)
and absorb and radiate different amounts of
energy. |
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