Geo1 - I. Feedbacks and coupling between Earth System...

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I. Feedbacks and coupling between Earth System components
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Earth system interactions In our 1st class, we recognized the Earth as a system of interacting components (i.e. the solid earth, atmosphere, oceans & ice sheets, and biota). Today we look at the nature of interactions within complex systems.
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today’s goals a focus on interactions • a working knowledge of the systems approach to the study of Earth and climate science • an ability to recognize and use the concept of feedback ( negative and positive ) • an ability to recognize and use the concept of equilibrium ( stable and unstable ) • an understanding of the relationship between forcing, feedback and equilibrium
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couplings (1-way interactions) positive coupling – something increases (decreases) causing something else to increase (decrease ) negative coupling – something increases (decreases) causing something else to decrease (increase ) ( + ) ( - ) source: Kump et al. “The Earth System”
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couplings (1-way interactions) negative coupling – something increases (decreases) causing something else to decrease (increase ) ( - ) source: Kump et al. “The Earth System”
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feedbacks (interaction in both directions) more complicated, but more interesting some simple examples………. ? ?
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negative feedback (w/ simple Hi/Low thermostat) net based on simple RULE: sign of feedback = sum of signs of couplings source: Kump et al. “The Earth System”
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negative feedback (w/ simple Hi/Low thermostat) body temperature time the system has reached equilibrium temp. no longer changes (much) negative feedbacks are stabilizing net what happened?
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positive feedback (thermostats in the wrong hands) interactions: 2 positive & 2 negative couplings net Jimmy’s thermostat is controlling Rosalynn’s blanket and visa versa what happens? source: Kump et al. “The Earth System”
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positive feedback (thermostats in the wrong hands) body temperature ( indiv . scales offset) time the positive feedback is destabilizing (the system is changing at an ever increasing rate) net what happened?
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positive feedback increases the strength of the influence negative feedback decreases the strength of the influence thus, as we have seen: positive feedbacks are destabilizing negative feedbacks are stabilizing some examples . ......
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clicker question #1 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 1750 1800 1850 1900 1950 2000 population size (billions) year AD is the feedback in this system: a) positive, b) negative , c) restoring equilibrium, d) destabilizing , e) both a & d .
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Geo1 - I. Feedbacks and coupling between Earth System...

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