SIO40lecture1

SIO40lecture1 - SIO 40 Life and Climate on Earth Lecture 1...

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SIO 40 – Life and Climate on Earth Lecture 1 – Overview Friday Sept 24 2010
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Lecture Outline The “Earth System” approach A model Earth system - the EcoSphere The Earth history perspective - examples of climate change over geological timescales The current climate assessment Climate projections
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Which one of these landscapes is actually on Mars? from “The search for a topographic signature of , Nature , Jan. 2006 (Mars is c. Similarities between the Earth and Martian landscape raise questions about whether the presence of life has a significant effect on a planet’s surface characteristics. Are the living and non-living components of a planet interactive?)
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Earth as a living organism, a global ecological system - the Gaia hypothesis According to the Gaia hypothesis first developed by James Lovelock in the 1960's, life as a whole fosters and maintains suitable conditions for itself by helping to create an environment on Earth suitable for its continuity. This is an extreme view of the degree of interaction between living and non-living planetary components.
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An "Earth System" approach In the "Earth System" approach, the biosphere (or ecosphere) is one of four interacting components that regulate biogeochemical cycling on the earth, the others being the atmosphere, hydrosphere, and lithosphere.
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A simple model earth system - the EcoSphere The Ecosphere is a closed seawater system, containing shrimp, algae, and bacteria.
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How does the EcoSphere function? The ecosphere depends on the input of light
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SIO40lecture1 - SIO 40 Life and Climate on Earth Lecture 1...

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