climate2 - The Greenhouse Effect and Global Heat Budget...

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The Greenhouse Effect and Global Heat Budget
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Greenhouse Effect / Global Heat Budget Components of a heat budget heat content temperature is a direct measure of heat content heat in heat out EARTH
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Greenhouse Effect / Global Heat Budget Inputs of heat energy to the earth: incoming solar radiation natural decay of radioactive materials biological systems human endeavors (fossil fuel burning)
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Greenhouse Effect / Global Heat Budget Average solar energy input to earth (averaged over illuminated half of the earth surface area = 255 x 10 12 cm 2 ) So what is a calorie? 2 calories / cm 2 ·min
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Greenhouse Effect / Global Heat Budget measure of heat energy - the amount of heat energy needed to raise the temperature of one gram of liquid water by one degree Celsius So what is a calorie? This is the calorie of chemistry and physics . The more familiar calorie of human nutrition is equal to 1000 of these chemistry calories. A calorie is a measure of energy .
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Greenhouse Effect / Global Heat Budget Solar energy input: 2 calories / cm 2 ·min Total solar input: 5 x 10 14 cal / min 500 trillion calories per minute total surface area = 255 x 10 12 cm 2
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Greenhouse Effect / Global Heat Budget How much heat is 500 trillion cal / min? Let’s ask this question in a context that we can all relate to! How much heat (or how many calories) are required to bring a cup of water at room temperature (20°C) to the boiling point of water (100°C) ? 20,000 calories !!
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How much heat is 500 trillion cal / min? Greenhouse Effect / Global Heat Budget Now let’s answer this question on a global scale . How many calories would it take to bring the world’s oceans to a boil (to raise the average temperature from 4°C to 100°C) ?? 1.4 x 10 17 grams of water • 1 calorie/ gram °C • 96°C total heat required = 1.34 x 10 19 calories
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Greenhouse Effect / Global Heat Budget How much heat is 500 trillion cal / min? At this rate of heat input from the sun, how long
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This note was uploaded on 01/10/2010 for the course BIOPL 2400 at Cornell.

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climate2 - The Greenhouse Effect and Global Heat Budget...

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