6 warm up wrap up 7 4, 6 warm up wrap up 1,3,7 greenhouse effect

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6 Warm up

Wrap up


34, 6 Warm up

Wrap up


Greenhouse effect


The menu for today6/26/2013

Greenhouse effectOzone depletionGlobal warmingWeather patterns changing

78% nitrogen

20.6% oxygen

< 1% argon

0.4% water vapor

0.036% carbon dioxide

traces gases:Ne, He, Kr, H, O3 Methane, Nitrous Oxide7Greenhouse effect Heat from the planets surface is absorbed by greenhouse gases, and is re-radiated in all directions

Selected Greenhouse GasesCarbon Dioxide (CO2) Source: Fossil fuel burning, deforestation Anthropogenic increase: 30%Average atmospheric residence time: 500 years

Selected Greenhouse GasesMethane (CH4) Source: Rice cultivation, cattle & sheep ranching, decay from landfills, mining Anthropogenic increase: 145%Average atmospheric residence time: 7-10 years

Selected Greenhouse GasesNitrous oxide (N2O) Source: Industry and agriculture (fertilizers) Anthropogenic increase: 15%Average atmospheric residence time: 140-190 years

Water VaporSelected Greenhouse Gases

1. Shorter, highEnergy wavelengths Hit the earthsSurface

2. Incoming energy Is converted to heat

3. Longer, infraredWavelengths hitGreenhouse gasMolecules in theatmosphere4. Greenhouse gasMolecules in theAtmosphere emitInfrared radiationBack towards earthSummary

Greenhouse gases absorb infrared radiation and prevent it from escaping to space.

Carbon dioxide, methane, and nitrous oxide are very goodat capturing energy at wavelengths that other compoundsmiss

ozone layer layer in Earth's atmosphere which absorbs most of the Sun's UV radiation

Ozone depletion a steady decline of about 4% per decade in the total volume of ozone in Earth's stratosphere (the ozone layer

ozone-depleting substances. CFCs, freons, halonsrefrigerants, propellants (in aerosol applications), and solvents

Global warming the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation

Who has been paying attentionWHY?Greenhouse Effect & Global WarmingThe greenhouse effect & global warming are not the same thing. Global warming refers to a rise in the temperature of the surface of the earth An increase in the concentration of greenhouse gases leads to an increase in the magnitude of the greenhouse effect. (Called enhanced greenhouse effect) This results is global warming

Effects of global warming

Effects of global warmingMelting of ice/North and south pole change salt and fresh water variables