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How does El Nino affect upwelling?

During an El Niño event, the easterly trade winds converging across the equatorial Pacific weaken. This in turn slows the ocean current that draws surface water away from the western coast of South America and reduces the upwelling of cold, nutrient–rich water from the deeper ocean, flattening out the thermocline.

What happens to the upwelling during La Nina years?

La Niña events are indicated by sea-surface temperature decreases of more than . Unusually strong, eastward-moving trade winds and ocean currents bring this cold water to the surface, a process known as upwelling. Upwelling can cause a drastic drop in sea-surface temperature.

Which of the following was one result of El Nino that occurred in 1997 to 1998?

El Niño during the time of 1997 to 1998 caused drought in Southeast Asia and flooding in much of Latin America and in the Horn of Africa due to significant amounts of rainfall. The effects in both places were numerous deaths. In areas where it flooded, mudslides occurred and spoiled seed stores.

What were three specific impacts of the 1997 El Nino?

Increased incidence of cholera, malaria and rift valley fever due to poor sanitation and lack of potable water threatened the flood-affected population. In Somalia and Kenya loss of human life was significant.

What was the worst El Nino in history?

The 1982-1983 El Niño was the strongest and most devastating of the century, perhaps the worst in recorded history. During that period, trade winds not only collapsed–they reversed. Its effects were long lasting as well.

Which year had the strongest El Nino?


What are the first signs of El Nino?

The first signs of an El Niño are:

  • Rise in surface pressure over the Indian Ocean, Indonesia and Australia;
  • Fall in air pressure over Tahiti and the rest of the central and eastern Pacific Ocean;
  • Trade winds in the south Pacific weaken or head east;

Is El Nino dry or wet?

The effects of El Niño in South America are direct and stronger than in North America. An El Niño is associated with warm and very wet weather months in April–October along the coasts of northern Peru and Ecuador, causing major flooding whenever the event is strong or extreme.

When did El Nino caused serious drought?

Resource Situation Papua New Guinea (PNG) has been suffering from drought and frost caused by the El Niño Southern Oscillation (ENSO) phenomenon since mid-2015. These events have seriously disrupted food production and livelihoods and led to widespread food and water shortages.

What’s the definition of El Nino?

El Nino means Little Boy, or Christ Child in Spanish. South American fishermen first noticed periods of unusually warm water in the Pacific Ocean in the 1600s. The full name they used was El Nino de Navidad, because El Nino typically peaks around December. El Nino can affect our weather significantly.

Why does La Nina cause drought?

The lower sea surface temperatures A usual, La Niña winter features drier and milder conditions across the Southern hemisphere. This causes elevated fire conditions and the Southeast drought conditions.

How can we reduce the effects of La Nina?

Avoid wading in floodwater. If you must, wear rubber boots. Clean-up all possible mosquito breeding sites, such as vases, empty coconut shells, old tires and tin cans. Stay inside a house or building during heavy rains.

What to do when there is El Nino?

6 Tips for Preparing for El Nino

  1. Clean Gutters.
  2. Check Water Valve & Learn How to Turn It Off.
  3. Check Supply Lines for Leaks.
  4. Proper Landscaping for Drainage Issues.
  5. Check for Rodents in Attic or Crawlspace.
  6. Check Coverage in Your Homeowner’s Insurance.

Can we stop El Nino?

There is nothing we can do to stop El Niño and La Niña events from occurring. The year-to-year oscillations between normal, warm, and cold conditions in the tropical Pacific associated with the ENSO cycle involve massive redistributions of upper ocean heat.