Unit03s_2

Unit03s_2 - 1 Global Warming Chem 003 Fall 2009 Blackboard:

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Global Warming Chem 003 Fall 2009 Blackboard: http://blackboard.gwu.edu OfFce hours: MW 3:10 3:55 PM, room 213 1957 E Street and by appointment Jean-Baptiste Joseph ourier, rench mathematician (1800): irst one introducing the concept of gases trapping the energy of the Sun ( greenhouse effect ). John Tyndall, British scientist (1860): demonstrates experimentally that CO 2 and H 2 O absorb heat radiation Matter and Radiation irst we need to estimate the temperature and the concentration of CO 2 in the past and look if there s any correlation. Temperature : from the isotopic ratio 2 H/ 1 H in ice cores in Antarctica. Isotopes: elements with the same atomic number, but different mass number. Is there any relationship between the concentration of CO 2 in the atmosphere and the temperature of the Earth? Water containing 1 H evaporates faster than water containing 2 H, and that shows on the isotopic ratio in snow. 1 H 1 1 H 2 Amount of CO 2 : determined by measuring CO 2 concentration in trapped air bubbles in ice. 2 http://www.ngdc.noaa.gov/paleo/icecore/antarctica/vostok/vostok_data.html Distribution of energy in solar radiation above the Earth s atmosphere 2 http://www.ngdc.noaa.gov/paleo/icecore/antarctica/vostok/vostok_data.html Distribution of energy in solar radiation above the Earth s atmosphere 3 Symmetric stretching Asymmetric stretching Bending Bending Molecular vibrations O O C O O C O O C O O C Infrared spectrum of carbon dioxide Wavenumber = 1/ 4 Earth Atmosphere Radiative Balance of the Earth Solar radiation Reflected by the atmosphere Absorbed by the atmosphere Absorbed by the Earth Irradiated by the atmosphere Irradiated by the Earth Greenhouse Effect The trapping of a fraction of the infrared radiation emitted by the Earth towards the atmosphere. Without this effect, the average temperature on the Earths surface would be -15C. The Greenhouse Effect Sun Greenhouse gases (CO 2 , CH 4 and H 2 O) trap 84% of the escaping energy. A steady-state is reached. Intergovernmental Panel on Climate Change (IPCC) Climate Change Report 2007 5 6 Carbon Cycle Human contributions to atmospheric CO 2 7 8 % increase 32 157 11- Trees help to maintain atmospheric levels of CO 2 by using it in photosynthesis ....
View Full Document

This note was uploaded on 11/09/2010 for the course CHEM 003 taught by Professor Marting.zysmilich during the Fall '06 term at GWU.

Page1 / 20

Unit03s_2 - 1 Global Warming Chem 003 Fall 2009 Blackboard:

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online