La Nina and El Nino Phenomena
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Transcript of La Nina and El Nino Phenomena
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La Nina and El Nino
Phenomena
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http://edition.cnn.com/video/#/video/weather/2009/07/27/byrnes.ctw.aregentino.el.nino.cnn?iref=videosearch Impact
http://www.youtube.com/watch?v=AEoHz56jWGYEl Nino Definition
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Water (Ocean) and Air (Atmosphere) Interactions
Trade Winds
Ocean Currents Air Pressure
Air and water temperature
Source: http://esminfo.prenhall.com/science/geoanimations/animations/26_NinoNina.htmlAnimation
La Nina 2011 videohttp://www.youtube.com/watch?v=iWTucpsClLc&NR=1&feature=fvwp
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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 pressure and 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.
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NORMAL CONDITIONS
Guide questions:
1. In what direction would the wind blow? 2. Describe the climate in the Western Pacific? Eastern Pacific? Consider a. pressure systems (high or low) b. ocean temperature
Western Pacific
(Australia)
Eastern Pacific(Peru)
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Guide questions:
1. Describe what is happening in the atmosphere (Walker Circulation Cell)?
2. Why is rain most likely to happen over a longer period in the Western Pacific?
Western Pacific
(Australia)
Eastern Pacific(Peru)
Trade winds blowing
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LA Nina CONDITIONS
Western Pacific
(Australia)
Eastern Pacific(Peru)
Guide questions:
1. What would happen to the water in the Eastern Pacific if the trade winds got stronger?
2. What would be the result of cold water moving towards the West (Think about the weather)?
Trade winds blowing
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Western Pacific
(Australia)
Eastern Pacific(Peru)
Guide questions:
1. 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
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• Trade winds weaken
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Global Impact
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La Nina
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http://www.youtube.com/watch?v=ovDp1crqdOUEl Nino/La Nina video (with impact on fishing and US
weather)
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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.
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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.
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Drought in Southern Africa, Southern India, Sri Lanka, Philippines, Indonesia, Australia, Southern Peru, Western Bolivia, Mexico, Central America
Heavy rain and flooding in Bolivia, Ecuador, Northern Peru, Cuba, U.S. Gulf States
Hurricanes in Tahiti, Hawaii
Atmospheric Consequences of El Niño
influencing weather patterns worldwide
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Why do we care: Global climate impacts continued
FloodsLakeport, California (1998)
FiresAustralia (1998)
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SOURCES:
•http://esminfo.prenhall.com/science/geoanimations/animations/26_NinoNina.html
•http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/eln/home.rxml
•PAGASA-DOST