Weather as a Feedback loop
All matter is part of a material pathway and the
composition of matter on the earth reflects the movement of various
materials through these pathways
Weather as a Feedback Loop
Unequal distribution of radiation due to earth axis tilt
is the ultimate driver of the weather. ( go here for a more detailed explanantion )
Heat, energy flow is generally from the equatorial regions
to the polar regions.
Rotation of the earth sets up large scale circulation cells
called Hadley Cells As well
as Rossby Waves . Forecasters
try to determine the short term behavior of
these Rossby Waves
High and low pressure systems then ride these waves through
the jet stream and that
trajectory (1.1 JDK applet) determines the kind of weather that
say, Oregon, gets.
Ocean currents and temperature influence the temperature of the
air and hence its capacity to hold moisture. This is why
El Nino can effect the world wide weather. Alteration of
normal sea surface temperatures feed back to the weather.
Changing the outgoing radiation balance of the earth also
leads to climate change - this is the greenhouse effect which
we will discuss in detail later
Large Scale climate is set up by the constant exchange of moisture
and energy between the ocean and the circulating atmosphere. These
determines large scale pattern of High and
Low pressure areas . Circulation around a Low Pressure system
is counterclockwise in the Northern Hemipshere. Circulation around a
High Pressure system is clockwise in the Northern Hemipshere.
Pacific Coast Pacific Maritime Climate
Cold Current, strong ON shore flow of dry air in the Summer no
East Coast Warm current, lots of moisture,
Bermuda High brings it a shore -summers suck!
Let's see the Movie which shows
the seasonal evolution of these currents
Internet Resource Alert:
Summary Lecture on Atmospheric Circulation
Summary of El Nino phenomena
Add your questions or comments about this particular lecture