Remember “normal” ocean circulation? El Nino? (warm) Trade winds weaken Thermocline drops Upwelling is cut off SST rises in E.Pacific High & Low pressure.

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Presentation transcript:

Remember “normal” ocean circulation?

El Nino? (warm) Trade winds weaken Thermocline drops Upwelling is cut off SST rises in E.Pacific High & Low pressure areas in Pacific reverse Disrupts fish/bird populations in E.Pacific Occur every 2-7 years Lasts months

La Nina? (cold) Trade winds strengthen SST decrease in E.Pacific Upwelling increases Occurs every 3-5 years Lasts 9-12 months

Prentice Hall Textbook animation linkTextbook animation link

Prentice Hall Textbook animation linkTextbook animation link

Prentice Hall Textbook animation linkTextbook animation link

Normal El nino – strong counter-current

Sea surface anomalies associated with El Nino

SST differences between El Nino and La Nina

A B C QUIZ! Which is which… Normal, El Nino, La Nina?

Were you’re predictions correct?

What are the effects of El Nino?

Brush fires caused by drought

Increased Tropical Storms

Devastating floods

Peruvian anchovy populations decline

Winter NH El Nino La Nina

Summer NH El Nino La Nina

El nino - precipitation

Hurricanes El Niño contributes to more eastern Pacific hurricanes and fewer Atlantic hurricanes. La Niña contributes to fewer eastern Pacific hurricanes and more Atlantic hurricanes. US hurricane damage

US Tornados Tornado activity Depends on the location of the polar jet stream El Nino: More to the south La Nina: more to the north

Measurements! How can we predict an El Nino or La Nina event?

Buoys Measure... temperature currents winds

Radiosonde Weather balloon Monitors global weather and climate patterns

Satellites Provide data on: Rainfall Wind Ocean temp. Sea surface height Ocean color Surface currents

TOPEX/Poseidon (T/P)

Click here to find out what the current sea surface temperatures are. Are we in an El Nino, La Nina, or neither?

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