Our unique atmosphere what you need to know to understand the ...

Our unique atmosphere what you need to know to understand the ...

Climate Change Its all about carbon What I need to know to understand climate Structure of the atmosphere

Heat-trapping gases The greenhouse effect Structure of the Atmosphere

Earths atmosphere is 372 miles thick (small compared to the size of the earth) Divided into four layers based on temperature (troposphere, tropopause, stratosphere, mesosphere, thermosphere,) Weather happens in troposphere = layer

closest to the earth Troposphere is the densest layer, holds 80% of water vapor OZONE http://eo.ucar.edu/staff/rrussell/atmosphere/images/mesosphere_diagram_big.jpg HIPPO

The atmosphere Atmosphere = the thin layer 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 Minute concentrations of permanent (remain at stable concentrations) and variable gases (varying concentrations)

Human activity is changing the amounts of some gases The atmospheres composition What is a greenhouse gas?

Turn to a partner and make a list of greenhouse gases Greenhouse Gases = Heat trapping Gases

CO2 GAS H2O VAPOR CH4 GAS carbon dioxide water vapor (humidity) methane

Heat trapping Gases (are they all the same?) Gas Global Warming Factor Concentration

parts (ppb*) Carbon Dioxide CO2 1 379,000

Methane CH4 21 1,760 Nitrous Oxide N2 O

310 320 Chlorofluorocarbon 5,000 to 14,000 s CFCs Ppb = parts per billion

Less than 1 Water vapor (H2O) is a very powerful heat trapping gas The Greenhouse Effect - Atmosphere http://www.ecoslopes.com/wp-content/ uploads/2009/03/greenhouse-effectsolutions-300x225.jpg

http://www.sciencebuzz.org/sites/all/files_static/global_warming/greenhouse_effect.gif The atmosphere = without it, the Earths temperature would be much colder Earths atmosphere, clouds, land, ice, and water absorb 70% of incoming solar radiation WHAT IS THE GREENHOUSE EFFECT?

SUN- Energy Budget W/m2 Turn to your neighbor and spend 2 minutes explaining Its all about carbon npr video clip on carbon

CO2 causes temperatures to rise Over the past 425,000 years, cool periods have coincided with times when the CO 2 concentration in the atmosphere was lower. When there is less CO2 in the atmosphere, the greenhouse effect is reduced and the world cools. The blue and red line indicates the variation in average global temperature compared with the 19611990 average. The green line shows the concentration of CO 2 in the atmosphere. (Pay close attention to the right-hand edge of the graph.) This graph shows four eras when the world was cooler than it is today. These are separated by brief warm periods, like the one we are now in.

The carbon cycle How much is going into the atmosphere?arbon cycle Living sources and sinks of CO2 During respiration, energy stored in a glucose is used to perform cellular activities.

sugar + oxygen CO2 + water + energy (to do work) During photosynthesis, energy from the sun converts carbon dioxide and water into glucose, an energy source. Oxygen is a byproduct of this process. water + CO2 + solar energy sugar +

oxygen Modeling the carbon cycle Student represents Ball of yarn represents Sources and sinks Carbon

RULES No one can get the ball twice until everyone has had it at least once. Tracking carbon Where it started

Where it went How it got there CO2 Emissions by country CO2 Emissions by Activity

Journal Prompt Write a short story from the perspective of a carbon atom as it travels through the carbon cycle. List the places you travel and how you move from place to place until you return to where you started.

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