Lectures Part 1

Lectures Part 1 - Earth Systems Systems are interconnected...

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Earth Systems Systems are interconnected reservoirs of matter and energy. Systems may be open, closed or isolated. Observations reveal that Earth has many systems, and all are connected.
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OPEN SYSTEM: Matter and energy are freely exchanged
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Lake Tahoe, California
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CLOSED SYSTEM Only energy is exchanged ISOLATED SYSTEM Neither matter nor energy are exchanged
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Systems Systems may also be dynamic or static.
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Dynamic System A system where available energy causes the system to change with time.
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Dynamic systems are continuously trying to attain a “steady” state. Earth systems are open and dynamic.
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Static System A system where the available energy does not change the system.
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Moon
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Different Types of Energy Affect Earth Systems Gravitational potential energy – energy due to position. Kinetic energy - the energy of a body in motion. Thermal energy – heat energy contained in a body. Solar energy – light energy from the sun.
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Energy is the ability to do work. Work is……. .? Think of work as “a transfer of matter”
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The distribution of energy determines if a system is stable or unstable. An initial change to the system may be amplified or damped out over time because the system is unstable or stable, respectively. The damping or amplification results from feedback.
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Systems can become stable or unstable with the addition or removal of mass or energy. Feedback processes will cancel or enhance an initial change to a system.
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Positive Feedback amplifier speaker microphone
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Positive Feedback A self reinforcing loop such that the system causes an initial change to be amplified with each cycle through the loop. amplifier speaker microphone
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Negative Feedback temp. increases thermostat cold air A/C example
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A self canceling loop such that the system causes an initial change to diminish with each cycle through the loop. temp. increases
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This note was uploaded on 06/03/2011 for the course GEOL 315 taught by Professor Torres during the Spring '11 term at South Carolina.

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Lectures Part 1 - Earth Systems Systems are interconnected...

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