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La Nina and El Nino Phenomena

La Nina and El Nino Phenomena. http://www.youtube.com/watch?v=AEoHz56jWGY El Nino Definition. http://edition.cnn.com/video/#/video/weather/2009/07/27/byrnes.ctw.aregentino.el.nino.cnn?iref=videosearch Impact . Water (Ocean) and Air (Atmosphere) Interactions.

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La Nina and El Nino Phenomena

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  1. La Nina and El Nino Phenomena

  2. http://www.youtube.com/watch?v=AEoHz56jWGY El Nino Definition http://edition.cnn.com/video/#/video/weather/2009/07/27/byrnes.ctw.aregentino.el.nino.cnn?iref=videosearch Impact

  3. Water (Ocean) and Air (Atmosphere) Interactions Source: http://esminfo.prenhall.com/science/geoanimations/animations/26_NinoNina.html Animation La Nina 2011 video http://www.youtube.com/watch?v=iWTucpsClLc&NR=1&feature=fvwp Trade Winds Ocean Currents Air Pressure Air and water temperature

  4. What do we already know? • Density: Warm air is less dense than cool air. Warm air rises. Cool air sinks. (convection) • Pressure: • High temperature means low air pressureand low temperature means high air pressure. High pressure = fair weather. Air masses press down, Warm air cannot rise and form clouds. • Low pressure = cloudy, rainy weather. Air masses move apart, warm air rises and form clouds. • Air moves from an area of high to low pressure.

  5. NORMAL CONDITIONS Eastern Pacific (Peru) Western Pacific (Australia) Guide questions: In what direction would the wind blow? Describe the climate in the Western Pacific? Eastern Pacific? Consider a. pressure systems (high or low) b. ocean temperature

  6. Eastern Pacific (Peru) Western Pacific (Australia) Trade winds blowing Guide questions: Describe what is happening in the atmosphere (Walker Circulation Cell)? Why is rain most likely to happen over a longer period in the Western Pacific?

  7. LA Nina CONDITIONS Eastern Pacific (Peru) Western Pacific (Australia) Trade winds blowing Guide questions: What would happen to the water in the Eastern Pacific if the trade winds got stronger? What would be the result of cold water moving towards the West (Think about the weather)?

  8. Eastern Pacific (Peru) Western Pacific (Australia) Guide questions: Why is there heavier rain observed in more countries in the western Pacific? 2. What changes in weather would occur in North America? Hint: red circle

  9. Trade winds weaken

  10. Global Impact

  11. La Nina

  12. http://www.youtube.com/watch?v=ovDp1crqdOU El Nino/La Nina video (with impact on fishing and US weather)

  13. During non-El Niño years, the southeast trade winds, drag surface water westward away from shore. As surface water moves away, upwelling brings up colder waters from depths of 40-80 meters or more. This deep sea water is rich in nutrients which can sustain large fish populations.

  14. During an El Niño event, the southeast trade winds weaken and so does the amount upwelling in the eastern Pacific. The deeper thermocline means that any upwelling that does occur is unable to tap into the rich nutrients found in deeper waters. Consequently, warm nutrient-poor water predominates the region and a decrease in the fish population is observed.

  15. Atmospheric Consequences of El Niño influencing weather patterns worldwide

  16. Why do we care: Global climate impacts continued FloodsLakeport, California (1998) FiresAustralia (1998)

  17. SOURCES: • http://esminfo.prenhall.com/science/geoanimations/animations/26_NinoNina.html • http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/eln/home.rxml • PAGASA-DOST

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