• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Explain El Nino and the La Nina weather phenomenon.

Extracts from this document...


Explain El Nino and the La Nina weather phenomenon Walker Circulation In a normal year the South East trade winds from the global circulation, blow from East to West creating the following conditions: * Warm surface waters from the Pacific are blown Westwards, creating warm water near Australasia. * The warm water heats the air in the Western Pacific this intern creates thunderstorms and convection activity. * In the Eastern Pacific the removal of warm surface water, which has been blown westward allows cooler water to rise. * Cool upwelling water near Peru creates higher air pressures on the coast of Peru, re-enforcing the trade wind circulation. The upwelling water is high in nutrients meaning that fish are plentiful. ...read more.


The low amounts of upwelling water off the coast of Peru causes their to be a decline in fish due to the lack of nutrients. Descending air in the Western Pacific compensates for rising convectional air near Peru. High pressure increases near Australasia causing droughts. La Nina general effects Generally when El Nino ceases, another weather condition develops. La Nina causes large amounts of warm water to shift westwards, this causes flooding in Australasia because of the increased rainfall and droughts in Peru / South America. In April/May 2000 desert areas surrounding Lake Eyre in Australia flooded during La Nina creating an inland sea. La Nina was also responsible for heavy flooding in South Africa that year. Case Studies Peru January 1998 all across Peru, El Nino caused extreme flooding, causing an estimated �700 billion in damage. ...read more.


Famine was widespread, this meant that the Country required temporary food aid. Eastern Kenya Flooding occurred in Eastern Kenya, caused by the El Nino effect. It took place in January which is usually the dry season. Flooding affected such a wide area, banana, coconut and mango trees were completely destroyed by the force of the flood water. This caused inflated prices, up to 50%. Villages were completely destroyed, and basic food supplies were low, most areas were only reachable by air. International Aid provided shelters, clothing and food. Disease was widespread, cholera was the main problem as sewage rose to the surface of the flood waters. Also malaria became an epidemic because of the huge areas of swamp, so mosquito nets were an essential item of aid. The main problem with El Nino is that it mainly affects Countries around the Pacific, which are generally some of the poorest Countries. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. The causes and effects of El Nino.

    This occurs as air rises (pressure falling) given wet conditions air adescending (high pressure) give arid conditions as shown by the Atacama. Due to greenhouse gases there has been more warming within the sea which has led to rising temperatures and in turn greater convection currents causing higher rainfall.

  2. The Aral Sea Disaster

    Yes I understand but what can we do if your cotton production is causing problems? Well I know that we are using the water and could be maybe wasting it and we are trying to reduce to amount of water waste it is hard.

  1. Water and Marine Resources

    Based in Copenhagen, ICES produces surveys of the world's fisheries. But advance word of this report, claiming the cod population of the Barents Sea has been over-estimated, has caused outrage in Norway. Fishermen claim cuts in quotas would cost them �200 million.

  2. The effects of organic effluent from the seweage on the biodiversty in a freshwater ...

    nymph, slow 3 3 - - Pea - cockle 3 - - - Phantom larva 2 2 - 2 Pond skater 5 - - 5 Rat - tailed maggot 3 - - - Saucer bug 8 - - 8 Stonefly nymph 10 - - - Snail - 3 per spp

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work