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Unit 4: Energy Flow in Global Systems
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Chapters: Chapter 10: Solar Energy and Climates Chapter 11: Climates and Biomes Chapter 12: Climate Change and Humans
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Ch 1: Solar Energy and Climates
The Biosphere
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Defining Systems: Three classes of systems are defined by the following: 1. Open system 2. Closed system 3. Isolated system
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Allows energy and matter to cross the systems boundary
Open System: Allows energy and matter to cross the systems boundary Examples:
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Allows only energy but NOT matter to cross the boundary
Closed System Allows only energy but NOT matter to cross the boundary Examples:
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Allows NEITHER energy nor matter to cross the boundary
Isolated System Allows NEITHER energy nor matter to cross the boundary Examples:
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The Biosphere
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Layers of the Biosphere
There are 3 layers that make up the biosphere: 1. Lithosphere 2. Hydrosphere 3. Atmosphere
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Lithosphere The Earth’s crust that forms land above sea level, at the ocean bottom, as well as the Earth’s mantel
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Hydrosphere Water on or near the Earth’s surface
Includes, oceans, rivers, lakes as well as water in the atmosphere (clouds) Cryosphere: water that is frozen in icecaps and permafrost
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Atmosphere A mixture of nitrogen, oxygen and other gases that extends 800km above the Earth’s surface
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Atmospheric Layers
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1. Troposphere Layer of gases from 0 km to 10 km from the surface
Temp decreases as altitude increases (from 170C to -600C) Contains 80% of the atmosphere’s gases Location weather occurs
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2. Stratosphere Above the troposphere from 10 km to 50 km above the surface Temperature increases to 0 degrees Planes fly in this layer due to its stability Contains no life forms Contains the ozone layer
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3. Mesosphere Above the stratosphere Reaches 85 km above the Earth
Temperature decreases to -1000C degrees
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4. Thermosphere Farthest layer from the Earth’s surface
Location of Northern Lights & space shuttle orbit Temperature increases to 15000C degrees! Very little gas in this layer
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Atmospheric Layers
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Earths Radiation Budget
What is Radiation? The mechanism of energy transfer in which in which atoms or molecules emit electromagnetic waves
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Earth’s Radiation Budget
The earth maintains an energy balance of these waves known as its radiation budget
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Welcome to the Family Feud!!
We surveyed 100 scientists and the top 4 answers are on the board: What is the most common obstruction that effects solar radiation coming into or leaving the earth?
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Survey says: Ozone layer Clouds 3. Albedo (surface reflection) 4. Dust
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Climate Vs. Weather Climate - long-term trend in atmospheric pressure, humidity, temperature and precipitation Weather - the above conditions at one time in one place
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What do you know? With a partner answer the following:
1. What determines the lengths of days and nights at different latitudes? 2. Why are days of daylight and darkness not equal? 3. Why do the seasons have unequal # of days? 4. What is significance about March 21th and September 23rd? 5. Explain why the warming of the earth is unequal?
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What determines the lengths of days and nights at different latitudes?
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Why are days of daylight and darkness not equal?
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Why do the seasons have unequal # of days?
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What is significance about March 21st and September 23rd?
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Explain why the warming of the earth is unequal?
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The Earths Tilted Axis Angle of Inclination: the angle of the equator with respect of the the plane of the earths surface around the sun
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Earth’s Rotation Around the Sun
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Seasons and Sunlight
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Uneven Distribution of Radiation
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Uneven Distribution of Radiation
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All of these factors lead to 3 major climate zones
Polar Temperate Tropical
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