4088255
Description
Mind Map by jacob jury, updated more than 1 year ago
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Created by jacob jury
over 10 years ago
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El Nino/La Nina
effect
- El Nino
- More frequent than the La
Nina.
- Primary effects: Temp changes, Precipitation changes, Storms change in intensity, change in currents, warmer
seas.
- Secondary Effects: Fires Drought Flooding Economic changes, price of heating, food, etc. Political and
social unrest, Crash of fisheries, Famine Plagues (hanta virus), Insect population explosion leading to
disease and plagues, Crop failure
- Secondary Effects: Fires Drought Flooding Economic changes, price of heating, food, etc. Political and
social unrest, Crash of fisheries, Famine Plagues (hanta virus), Insect population explosion leading to
disease and plagues, Crop failure
- Benefits of El Nino: Fewer hurricanes and other tropical cyclones in the north Atlantic, Milder winters
in southern Canada and the northern continental United States, Replenishment of water supplies in
the southwestern U.S, Less disease in some areas due to drier weather (like malaria in southeastern
Africa)
- More frequent than the La
Nina.
- Typically last 9-12 months, every 2-7
years.
- La
Nina
- Less frequent than El Nino
- Global impacts: Globally, La Niña is characterized by wetter than normal conditions west of the
equatorial central Pacific over northern Australia and Indonesia during the northern hemisphere
winter, and over the Philippines during the northern hemisphere summer. Wetter than normal
conditions are also observed over southeastern Africa and northern Brazil, during the northern
hemisphere winter season. During the northern hemisphere summer season, the Indian monsoon
rainfall tends to be greater than normal, especially in northwest India. Drier than normal conditions
are observed along the west coast of tropical South America, and at subtropical latitudes of North
America (Gulf Coast) and South America (southern Brazil to central Argentina) during their respective
winter seasons.
- Effects: Changes in global atmospheric circulation patterns accompany La Niña and are responsible
for weather extremes in various parts of the world that are typically opposite to those associated
with El Niño. These patterns result from colder than normal ocean temperatures inhibiting the
formation of rain-producing clouds over the eastern equatorial Pacific region while at the same time
enhancing rainfall over the western equatorial Pacific region (Indonesia, Malaysia and northern
Australia.) These patterns affect the position and intensity (weakening) of jet streams and the
behavior of storms outside of the tropics in both the Northern and Southern hemispheres.
- Less frequent than El Nino
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