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Published byMiguel Grady Modified over 5 years ago

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Homeostasis Walter Cannon 1932 The Wisdom of the Body Jame Lovelock ~1969 Gaia hypothesis (Lovelock, J.E.; Margulis, L. (1974). "Atmospheric homeostasis by and for the biosphere- The Gaia hypothesis". Tellus 26 (1): 2–10.GaiaTellus

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Draw a causal lop diagram describing a self regulating component of the human body.

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Example Draw a causal loop diagram to describe the following: The sun becomes brighter causing Earth to warm to a new equilibrium temperature. sunlight Earths mean Temperature Emitted infrared energy + - - +

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Coffee System Tc TRTR The hotter the coffee is The faster it cools Tc-T R Cooling Rate The higher the cooling rate The colder the coffee Cooling Rate Tc-T R + -

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Coffee System Tc TRTR The hotter the coffee is The faster it cools Tc-T R Cooling Rate The higher the cooling rate The colder the coffee - + - = -

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Negative connection The higher the cooling rate The colder the coffee Cooling Rate Tc-T R - Tc TRTR

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Positive connection The hotter the coffee is The faster it cools Tc-T R Cooling Rate + Tc TRTR

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Negative feedback loop Tc TRTR The hotter the coffee is The faster it cools Tc-T R Cooling Rate The higher the cooling rate The colder the coffee - + - = -

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Cools with a characteristic time constant, minutes

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Homeostasis is internal balance

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Equilibrium

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Stable equilibrium (negative feedback)

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Unstable equilibrium (positive feedback),

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Perturbations Small changes that disturb a system from its equilibrium state. Hot Plate

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A simple Earth Heating rate TETE

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A simple Earth Heating rate TETE Albedo Absorbed solar Complete the system diagram

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Daisy World simulation

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Daisy World Average surface Temp Daisy coverage TsDaisies Ts Daisies Albedo

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Daisy World Average surface Temp Ts Daisies Daisy coverage TsDaisies

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Daisy World Average surface Temp Ts Daisies Daisy coverage TsDaisies albedo P1P1 P1P1 Ts Daisies albedo P2P2 P2P2

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Daisy World Model

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