Systems - SCI Notes 2/10 Laposata Systems and Change: The...

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SCI Notes 2/10 Laposata Systems and Change: The Basics System o Any part of the universe that can be isolated for study o Systems exist at multiple scales Molecules, Organisms, Ecosystems, Earth. Why study systems o Most natural processes involve regulated systems o Human impacts upset regulation o RESULT: Altered regulation = environmental impacts Humans and Nature o The Infamous Exploding Whale Types of Systems o Open System o Closed System Residence time o Average residence time: Time it takes for a part of the total pool of a material to cycle through the system o Calculating Residence Time: R.T. = Total Pool size divided by the average transfer rate (When pool size and transfer rate are constant) Average transfer rate = amount of inputs/outputs in a given period of time Example: College has 20,000 students
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Graduates 4,000 students and admits 4,000 students each year What is the average residence time for a student? 20,000 divided by 4,000 = 5 years Biological example: Pollution Lake 1: o Small, stream-fed o Rapid transfer rate o Short Residence Time Lake 2: Large, runoff-fed Slow Transfer rate Long residence time Feedback o When output of system serves as input and affects system
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Systems - SCI Notes 2/10 Laposata Systems and Change: The...

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