Battle against Global Warming: The Earth Radiation Balance Factor Submitted by – Suryaveer Singh (PGT Geography) S.D.PUBLI...
The Battle Against Global Warming The Earth Radiation Balance Factor
Why we are here? <ul><li>Learn the factors which causes Global Warming, from astronomical to terrestrial . </li></ul><ul><...
The bleak and Iceless future <ul><li>Gangotri glacier is shrinking 23m every year. </li></ul><ul><li>Polar ice caps are me...
The symptoms of Global Warming <ul><li>The year 1998 recorded the warmest temperature of the millennium and some of the wo...
Extreme weather events <ul><li>Ice Age cometh: it happened in the North Atlantic and may happen again. </li></ul><ul><li>A...
Anthropogenic effect on climate <ul><li>The most important effect on the climate is the increasing trend in the concentrat...
Earth’s Radiation Balance <ul><li>The earth as a whole does not accumulate or loose heat. </li></ul><ul><li>It maintains i...
The Earth’s Radiation Balance Assume 100 units of incoming solar energy (insolation):   (ncert, p. 65) 100 units 6 reflect...
The Radiation Balance: Longwave Absorbed by CFCs, CH 4 ,  N 2 O, CO 2 , O 3 17 23 Turbulance and convection Condensation E...
The Earth’s Heat Budget 17 23 wind Cond. 48 9 19 6 27 2 100 51 4 10 shortwave long wave total +100  -100 +51  -51 6
Greenhouse Effect <ul><li>Certain  greenhouse gases , such as carbon dioxide, chlorofluorocarbons, ozone, nitrous oxide an...
Rest is simple mathematics <ul><li>The larger the concentration of greenhouse gases in the atmosphere, the higher will be ...
Warming Up  <ul><li>The amount of heat energy added to the atmosphere by the  greenhouse effect  is controlled by the conc...
Other factors: Sunspots <ul><li>When the number of sunspots decrease warm and drier conditions prevail on the earth. </li>...
Volcanism  <ul><li>Eruptions throws up lots of aerosols into the atmosphere. </li></ul><ul><li>They remain for a considera...
Efforts which can be done! <ul><li>Reduce emission of greenhouse gases. </li></ul><ul><li>Adopting lifestyle where there i...
Lets do it! <ul><li>Frequently Asked Questions </li></ul><ul><li>Terms to Remember (read handouts) </li></ul><ul><li>Take ...
Acknowledgements <ul><li>Whitlow, J.B. 2001. The Penguin Dictionary of Physical Geography. Second Edition. Penguin, Harmon...
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Earth Radiation Balance Project

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Earth Radiation Balance Project

  1. 1. Battle against Global Warming: The Earth Radiation Balance Factor Submitted by – Suryaveer Singh (PGT Geography) S.D.PUBLIC SCHOOL, BU BLOCK, PITAMPURA, DELHI -110088
  2. 2. The Battle Against Global Warming The Earth Radiation Balance Factor
  3. 3. Why we are here? <ul><li>Learn the factors which causes Global Warming, from astronomical to terrestrial . </li></ul><ul><li>We will be talking on radiation balance specifically. </li></ul><ul><li>Research the relationships between Greenhouse gases and the balance. </li></ul><ul><li>To find solution and plan our actions to control Global warming. </li></ul>
  4. 4. The bleak and Iceless future <ul><li>Gangotri glacier is shrinking 23m every year. </li></ul><ul><li>Polar ice caps are melting and breaking away due to global warming. </li></ul>Source: NASA
  5. 5. The symptoms of Global Warming <ul><li>The year 1998 recorded the warmest temperature of the millennium and some of the worst floods around the world. </li></ul><ul><li>The Sahel region of Sahara saw worst devastating drought. </li></ul>(Source: Times of India)
  6. 6. Extreme weather events <ul><li>Ice Age cometh: it happened in the North Atlantic and may happen again. </li></ul><ul><li>According to scientists global warming could lead to prolonged chill. </li></ul>(Source: Earth Observatory)
  7. 7. Anthropogenic effect on climate <ul><li>The most important effect on the climate is the increasing trend in the concentration of greenhouse gases which are likely to cause global warming. </li></ul><ul><li>They alter the process of earth radiation balance by absorbing longwave radiation. </li></ul>
  8. 8. Earth’s Radiation Balance <ul><li>The earth as a whole does not accumulate or loose heat. </li></ul><ul><li>It maintains its temperature. </li></ul><ul><li>This happens only if the amount of heat received in the form of insolation equals the amount lost by the earth through terrestrial radiation. (Heat Budget) </li></ul>
  9. 9. The Earth’s Radiation Balance Assume 100 units of incoming solar energy (insolation): (ncert, p. 65) 100 units 6 reflected by clouds 27 2 reflected by ground Backscattered 10 Absorbed by atmosphere 4 absorbed by clouds 51 absorbed by ground <ul><li>14 units </li></ul><ul><li>absorbed by </li></ul><ul><li>atmosphere </li></ul><ul><li>51 units </li></ul><ul><li>absorbed by </li></ul><ul><li>surface </li></ul><ul><li>35 units </li></ul><ul><li>reflected </li></ul><ul><li>( albedo ) </li></ul>albedo
  10. 10. The Radiation Balance: Longwave Absorbed by CFCs, CH 4 , N 2 O, CO 2 , O 3 17 23 Turbulance and convection Condensation Emission by GHGs 48 9 19 6 = 51 = 65 Direct radiation by earth
  11. 11. The Earth’s Heat Budget 17 23 wind Cond. 48 9 19 6 27 2 100 51 4 10 shortwave long wave total +100 -100 +51 -51 6
  12. 12. Greenhouse Effect <ul><li>Certain greenhouse gases , such as carbon dioxide, chlorofluorocarbons, ozone, nitrous oxide and methane , are able to absorb longwave radiation emitted from the Earth's surface. </li></ul><ul><li>The greenhouse effect aids in heating the Earth's atmosphere. </li></ul>
  13. 13. Rest is simple mathematics <ul><li>The larger the concentration of greenhouse gases in the atmosphere, the higher will be absorption of longwave radiation, thus resulting in increased temperature. </li></ul>Annual quantity of longwave Radiation absorbed in the a Atmosphere. ( Image created by the CoVis Greenhouse Effect Visualizer ).
  14. 14. Warming Up <ul><li>The amount of heat energy added to the atmosphere by the greenhouse effect is controlled by the concentration of greenhouse gases in the Earth's atmosphere. </li></ul><ul><li>All of the major greenhouse gases have increased in concentration since the beginning of the Industrial Revolution (about 1700 AD). </li></ul><ul><li>As a result of these higher concentrations, scientists predict that the greenhouse effect will be enhanced and the Earth's climate will become warmer. </li></ul>
  15. 15. Other factors: Sunspots <ul><li>When the number of sunspots decrease warm and drier conditions prevail on the earth. </li></ul><ul><li>If they increase, cooler and wetter weather with greater storminess occur. </li></ul>Source: www.physicalgeography.net/)
  16. 16. Volcanism <ul><li>Eruptions throws up lots of aerosols into the atmosphere. </li></ul><ul><li>They remain for a considerable period of time reducing the sun’s radiation reaching the Earth’s surface. </li></ul>( Source: U.S. Geological Survey, photograph by Austin Post ).
  17. 17. Efforts which can be done! <ul><li>Reduce emission of greenhouse gases. </li></ul><ul><li>Adopting lifestyle where there is no room for such gases. </li></ul><ul><li>Raising concerns for the world community to respond. </li></ul>
  18. 18. Lets do it! <ul><li>Frequently Asked Questions </li></ul><ul><li>Terms to Remember (read handouts) </li></ul><ul><li>Take home activity </li></ul><ul><li>Test yourself </li></ul>
  19. 19. Acknowledgements <ul><li>Whitlow, J.B. 2001. The Penguin Dictionary of Physical Geography. Second Edition. Penguin, Harmondsworth. </li></ul><ul><li>www.physicalgeography.net/fundamentals </li></ul><ul><li>Richard H. Bryant. 1999. Physical Geography. Ninth Edition. Rupa & Co., Delhi. </li></ul><ul><li>Barry, R.G., and Chorley, R.J., 1976. Atmosphere, Weather and Climate. (Chapter 1). Third Edition, London. </li></ul><ul><li>www.narc.nasa.gov/ </li></ul><ul><li>www.eosb.narc.nasa.gov/ </li></ul><ul><li>www.ocs.ou.edu/ </li></ul><ul><li>www.wikipedia.org/greenhouseeffect/ </li></ul>
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