Earths Energy Balance The role of the Sun and atmosphere in establishing Earths surface temperature.

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Presentation transcript:

Earths Energy Balance The role of the Sun and atmosphere in establishing Earths surface temperature

Energy Flow To solve a crime you follow the money; to understand many environmental problems, follow the energy. Energy changes form but the total amount is always conserved. Energy changes form but the total amount is always conserved. Energy eventually degrades into heat. Energy eventually degrades into heat. A place reaches a higher temperature when energy spends more time therebut just as much energy is always emitted as is absorbed. A place reaches a higher temperature when energy spends more time therebut just as much energy is always emitted as is absorbed.

Energy Balance Diagram

Solar Insolation: The Sun in January

Solar Insolation: The Sun in June

Vostok Ice Cores and Milankovitch Cycles

Solar Activity Sunspot number measures of solar activity. Sunspot number measures of solar activity. Sun is actually brighter when more active. Sun is actually brighter when more active. In Maunder Minimum (shortly after Galileo) Sun was less active and Earth was cooler. In Maunder Minimum (shortly after Galileo) Sun was less active and Earth was cooler.

Solar Variations and Climate Most climatologists models conclude solar variations alone cannot explain current amount of warming.

Earth Radiation Budget Experiment What comes out must go in

Solar Energy Potential

The Carbon Cycle The Earth is a closed system for carbon The Earth is a closed system for carbon Recycling of carbon takes place on many different time scales. Recycling of carbon takes place on many different time scales.

Carbon Dioxide History Pollutants are causing changes in trace molecules