Day 1 of Global Warming. Copyright 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings

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1 Day 1 of Global Warming Copyright 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings

2 The Atmosphere Atmosphere = the thin layer (1/100 th of Earth s diameter) of gases that surrounds Earth - Absorbs radiation and moderates climate - Transports and recycles water and nutrients - 78% nitrogen gas, 21% oxygen gas, 1% other gases - Its four layers differ in temperature, density and composition

3 The layers of the atmosphere Copyright 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Troposphere = bottommost layer - Air for breathing, weather - Temperature declines with altitude Stratosphere = km (7-31 mi) above sea level - Drier and less dense, with little vertical mixing - Contains UV radiation-blocking ozone, Mesosphere = km (31-56 mi) above sea level - Extremely low air pressure Thermosphere = atmosphere s top layer

4 Atmospheric properties Atmospheric pressure = measures the force per unit area produced by a column of air - Decreases with altitude Relative humidity = the ratio of water vapor a given volume of air contains to the amount it could contain at a given temperature Temperature = varies with location and time

5 Solar energy heats the atmosphere The space between the Earth and sun determines the amount of solar energy striking the Earth Energy from the sun - Heats air - Moves air - Creates seasons - Influences weather and climate Solar radiation is highest near the equator

6 Solar energy causes air to circulate Air near Earth s surface is warmer and moister than air at higher latitudes Convective circulation = less dense, warmer air rises and creates vertical currents - Rising air expands and cools - Cool air descends and becomes denser, replacing warm air - Influences both weather (short term) and climate (long term) Copyright 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings

7 Air masses produce weather Front = the boundary between air masses that differ in temperature, moisture, and density Warm Front = the boundary where warm moist air replaces colder, drier air Cold Front = the boundary where colder, drier air displaces warmer, moister air

8 Air masses have different atmospheric pressures High-pressure system = air that moves away from a center of high pressure as it descends - Brings fair weather Low-pressure system = air moves toward the low atmospheric pressure at the center of the system and spirals upward - Clouds and precipitation

9 The Sun and atmosphere keep the Earth warm Three factors exert more influence on climate than all others The Sun = without it, the Earth would be dark and frozen - Also supplies most of our planet s energy The atmosphere = without it, the Earth s temperature would be much colder - Earth s atmosphere, clouds, land, ice, and water absorb 70% of incoming solar radiation The oceans = shape climate by storing and transporting heat and moisture

10 Greenhouse gases warm the lower atmosphere As Earth s surface absorbs solar radiation, the surface increases in temperature and emits infrared radiation Greenhouse gases = atmospheric gases that absorb infrared radiation - Water vapor, ozone, carbon dioxide, nitrous oxide, methane, chlorofluorocarbons (CFCs) - Greenhouse gases differ in their ability to warm the troposphere and surface

11 The greenhouse effect After absorbing radiation, greenhouse gases re-emit infrared energy - Greenhouse effect = some energy travels back downward, warming the atmosphere and planet s surface

12 Carbon dioxide is of primary concern Not the most potent greenhouse gas, but it is extremely abundant - The major contributor to global warming Human activities have boosted atmospheric concentrations to their highest levels in more than 650,000 years

13 Other greenhouse gases add to warming Methane (CH 4 )= fossil fuel deposits, livestock, landfills, and crops such as rice Nitrous oxide = feedlots, chemical manufacturing plants, auto emissions, and synthetic nitrogen fertilizers Ozone = risen due to smog Water vapor = the most abundant greenhouse gas and contributes most to the greenhouse effect - Could increase cloudiness, which might slow global warming by reflecting more solar radiation back into space

14 What is climate change? Climate = an area s long-term atmospheric conditions - Temperature, moisture content, wind, precipitation, etc. Global climate change = describes trends and variations in Earth s climate - Temperature, precipitation, storm frequency Global warming = an increase in Earth s average temperature - Earth s climate has varied naturally through time - It is only one aspect of global climate change

15 Day 2 of Global Warming Copyright 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings

16 Temperature changes are greatest in the Arctic Ice caps are melting Polar bears and other arctic animals are starving Storms are increasing Sea ice is thinning

17 Temperatures will rise 0.2 degree Celsius per decade More frequent heat waves Temperature change will vary by region Stronger storms

18 Melting snow and ice Mountaintop glaciers are disappearing -In Glacier National Park, only 27 of 150 glaciers remain -Risks of sudden floods as ice dams burst -Reducing summertime water supplies Melting of the Greenland and Antarctic ice sheet is accelerating As ice melts, darker, less-reflective surfaces are exposed and absorb more sunlight, causing more melting As ice melts, the amount of water in the ocean increases.

19 Rising sea levels As glaciers and ice melt, increased water will flow into the oceans As oceans warm, they expand (thermal expansion) Leads to beach erosion, coastal floods, and intrusion of salt water into aquifers

20 Climate change affects organisms and ecosystems Organisms are adapted to their environments, so they are affected when those environments change Global warming modifies temperature-dependent phenomena - Timing of migration, breeding Spatial shifts in the range of organisms - Animals and plants will move towards the poles or upward in elevation % of all species will be threatened with extinction Plants act as carbon sinks; fewer plants means more CO 2 in the atmosphere

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