Greenhouse effect Project-Based Global Climate Change Education Curriculum Development Workshop Clarkson University.

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Presentation transcript:

Greenhouse effect Project-Based Global Climate Change Education Curriculum Development Workshop Clarkson University

Global radiation Source: Trenberth et al. (2009).

Earth-Sun Interaction

Solar radiation The sun emits energy in the form of electromagnetic radiation – The emission characteristics of sun’s radiation can be understood by considering it as a black-body – A blackbody is an idealized body which is a perfect absorber of all electromagnetic radiation The energy is spread over a range of wavelengths The wavelength corresponding to the peak energy is dependent on the temperature of the black body

Wavelengths

Black-body radiation Blackbody radiation – Thermal radiation of a black body – Earth and Sun can be considered as blackbodies i.e., perfect absorbers of radiation Emission spectrum is dependent on the temperature of the body Emission spectrum is dependent on the temperature of the body Source: PhET, University of Colorado. Note: Flash required to run this program ( )

Emission profiles Sun (5777K) Earth (300K)

Incoming solar radiation Source:

Solar radiation balance at the surface Source:

Greenhouse gases Greenhouse effect – Long-wave radiation absorbed by molecules in the atmosphere Result in increase in temperature of the atmosphere Radiate energy back to earth – Visualization of the greenhouse effect CO 2 interaction with radiation CO 2 interaction with radiation – Source: King's Centre for Visualization in Science,The King's University College, Edmonton, Alberta, Canada, The different greenhouses gases – Source: Source: Earth’s temperature as a function of atmospheric greenhouse gas concentration Earth’s temperature as a function of atmospheric greenhouse gas concentration – Source: PhET, University of Colorado;

Solar radiation spectrum Source: Wikipedia

Atmosphere Energy Budget Source:

Global radiation Source: Trenberth et al. (2009).

Radiation budget Source:

Radiation spectra Source: Wikipedia

Applets Install Java – To check if Java is already installed in your computer, go to, – If not, download the program ( Adobe Flash – Test your Adobe Flash installation ( ) – Install Adobe flash ( Applets source: – Radiation – CO2-radiation interaction and IR spectra – Greenhouse gas and Earth’s temperature – Carbon Cycle Other References: – IPCC report, 2007 – Hardy J.T., Climate change: Causes, Effects, and Solutions, Wiley Publications, 2006 – – Wikipedia