Natural Variations in Climate. 1. El Nino and La Nina Natural changes in climate due to warmer or...
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![Page 1: Natural Variations in Climate. 1. El Nino and La Nina Natural changes in climate due to warmer or cooler than normal surface water in the eastern Pacific.](https://reader036.fdocuments.in/reader036/viewer/2022070401/56649f1b5503460f94c3010b/html5/thumbnails/1.jpg)
Natural Variations in Climate
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1. El Nino and La Nina
• Natural changes in climate due to warmer or cooler than normal surface water in the eastern Pacific
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Normal Conditions/Trade Winds
• Normally, strong trade winds blow from the east along the equator, pushing warm water into the Pacific Ocean.
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El Nino• El Nino – unusual ________ of ocean
temperatures of Pacific Ocean
• results from weakened or a reverse in trade winds in the western Pacific Ocean, allowing piled-up warm water to flow toward South America.
warming
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El Nino Weather in the US• Northeast United States is warmer
• Western US is stormy
• Southern US is cold and wet
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La Nina• unusual _________ of ocean temperatures of
Pacific Ocean• Results in stronger low-level winds along the
equator• Northern US harsh winter conditions• Southern US drier and warmer condition
cooling
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El Nino or La Nina – 2014/2015?
El Nino La Nina
Based on our winter, do you think its an El Nino year or a La Nina year?
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2. Solar Cycle
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3. Ice Ages
• Milankovitch Cycle – Gradual changes in Earth’s rotation and orbit have changed the intensity of sunlight received in our planet’s polar and equatorial regions
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Ice Ages are cyclic.
The last one occurred ~12,000 years ago
The exact cause of what triggers an ice age
is not known
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Earth’s Tilt
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Earth’s Wobble
Currently points toward Polaris but every 13000 years it will point toward Vega
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Earth’s orbit
• B.
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http://www.youtube.com/watch?v=gaJJtS_WDmI
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4. Volcanic Eruptions
Large quantities of Volcanic Ash that are released into atmosphere which blocks incoming solar radiation,
Thus, cools the earth
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Mt. Pinatubo
• Erupted in 1991, caused cooler temps around the world for about 2 years.