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An introduction to the history of el nino the man made environmental disaster

The man-made environmental disaster made out to be, or an escape from what researchers cannot explain? Understanding the events structure and global impact is the first step to interpreting these questions. The global population cannot take sides on an issue that they do not comprehend, yet recent data encourages the belief that humans are to blame for this ecological disaster and continuously make it worse.

Accurately measuring recent El Ninos and predicting those that follow, will determine if we should be concerned about what is happening climatically. This paper suggests that there is a lot to be learnt about this outrageous environmental fiasco. Without proper information there can be no judgement and there can be no correction.

The only hardened fact that remains is that this topic, El Nino, should not be ignored, for if it does worsen, the whole world will be different.

Environment/El Nino term paper 548

Hymmen 4 What is El Nino? For hundreds of years, Peruvian fishermen noticed an unusually warm water current that appeared every year around Christmas. What was once an annual weather occurrence grew into a global phenomenon, linking many unconnected and unusual weather events around the world. A typical warm El Nino phase could last between 8 and 18 months.

The unheard of counterpart to El Nino is La Nina or El Viejowhich is the cold phase that could be just as strong, but with opposing effects. However, the cycle is unlike the changing seasons, and can vary in strength and timing. Currently, scientists do not completely understand what causes changes in the ENSO cycle. How does El Nino work? Under normal circumstances, cold water deep below the surface of the ocean tends to rise, and mixing with the water at the surface creates a transition zone called thermocline Environment Canada-Internet.

As cold water reaches the surface, small life forms begin feeding on its rich nutrients. Cold water will continue to rise because trade winds blow the warm surface water from east to west. Few thunderstorms and little rainfall result from these stable atmospheric conditions of a non-El Nino season.

But during El Nino, the trade winds weaken leaving a deeper layer of warm surface water and making it difficult for cold water to rise to the Hymmen 5 ocean surface.

Since warm water lacks nutrients, the fish that relied upon the small life forms accompanying the cold water die off.

An increase of thunderstorms and heavy rainfall may also occur. El Nino is much more than a temperature change in the ocean levels. During a usual season, the trade winds blow from east to west across the southern Pacific, moving warm water to the west. These differing pressures, in turn, drive the trade winds. However, during El Nino the pressures seesaw, a high pressure dominating the west and a low in the east, thus changing the winds and flow of ocean currents Thrive Online-Internet.

Environmental Impacts A mature El Nino will affect the weather around the world. Nevertheless, the most visible impacts generally take place in the tropical areas. It typically produces drought over southeast Asia, Australia and sometimes New Zealand. As well it frequently causes abnormally high rain falls over South America - in places which are often very dry Environment Canada-Internet.

As the El Nino phenomenon increases, its effects can be felt beyond the tropics. The warm water creates more uncommonly intense hurricanes in the Pacific.

An introduction to the history of el nino the man made environmental disaster a fierce El Nino, storms travel from the tropics producing heavy rainfall, flooding and damage across the globe. The largest known ecological effect of El Nino took place in 1970 when the nutrient Hymmen 6 supply for fish collapsed off the coast of Peru and Equador. Back to back El Ninos in 1972 and 1974 forced the Fisheries Minister of Peru to prevent anyone from fishing the near barren area.

Several years later, despite a dramatic attempt to recover, the damage appeared to have been permanent and is not expected to recover. In Canada, the most evident effects of El Nino take place in the winter. Air temperatures across the country rise an average of 3 degrees Celcius during El Nino. This creates uncommonly mild and dry winters, most noticeable over the Prairies and British Columbia. Tahiti and Darwin are anti correlated, for example, when Tahiti pressure is high, Darwin pressure is low.

Normally, Tahiti pressure is high, indicating that winds are blowing toward the west, but eastbound trade winds are a direct link to El Nino. The greatest advantage of SOI is that data has been available since the 1880's.

Therefore, it is far more accountable than any other measurement.

Introduction

The Southern Oscillation Index is given in units of standard deviation. Although, scientists do not believe that the Southern Oscillation Index should be Hymmen 7 the single source summarizing the intensity of an entire El Nino event. The difference between this occurrence and others in the past was that this one was predicted. Relying on satellites, temperature-measuring buoys, and simulations of the ocean and atmosphere, meteorologists were able to forecast El Nino's latest appearance.

TAO measures sea surface temperatures, surface winds, air temperature, humidity and even subsurface temperatures. Using the satellite information, NASA is able to monitor the changing atmospheric and oceanic conditions in the tropical Pacific Ocean to predict the next few weeks and months.

Distinct indications of future El Nino events include stronger than normal easterly winds and above average sea surface temperatures. With both satellite and buoy information meteorologists now visualize graphic displays of what is happening, rather than trying to make sense of numbers on computer paper.

Starting in 1976, oceanic warmings known as El Ninos have popped up with a frequency unmatched in the last 113 years Monastersky 54. A number climate researchers have suggested that recent El Ninos have not been consistent with the natural patterns of those two decades ago.

Using computer simulation and past information researchers believe that the recent El Ninos are highly unusual. Long-lasting deviations such as the last El Nino occur only once every 1,500 to Hymmen 8 3,000 years and twenty-year-long periods of frequent warmings occur only once every 2,000 years NOVA Online-Internet. These statistics encouraged climate researchers Kevin E. Trenberth and Timothy J. Hoar to conclude that, "The possibility that the [El Nino] changes may be partly caused by the observed increase of greenhouse gases," produced by the burning of fossil fuels Monastersky 54.

It is possible that as greenhouse gases heat the globe, more frequent and long-lasting El Ninos could occur. On the other side, there are those researchers that suggest these climate variations are within normal limits and that all climate events are natural. Barnett debates, "I have problems with generating 1 million years of variation using 100 years worth of data," he continues to say, "It doesn't convince that this is rare" Monastersky 54.

  • New York, 1992 El Nino - Overview;
  • Understanding the events structure and global impact is the first step to interpreting these questions;
  • Long-lasting deviations such as the last El Nino occur only once every 1,500 to Hymmen 8 3,000 years and twenty-year-long periods of frequent warmings occur only once every 2,000 years NOVA Online-Internet;
  • As well it frequently causes abnormally high rain falls over South America - in places which are often very dry Environment Canada-Internet;
  • Although, scientists do not believe that the Southern Oscillation Index should be Hymmen 7 the single source summarizing the intensity of an entire El Nino event;
  • Starting in 1976, oceanic warmings known as El Ninos have popped up with a frequency unmatched in the last 113 years Monastersky 54.

Neither interpretation should be taken for the truth, whereas the truly significant statistics will not be available for another 100 years. Hymmen 9 Conclusion El Nino is a naturally occurring phenomenon, that is understood.

But it remains unexplained as to why it occurs or when it does, and even with what force it emanates. Impacting the globe as it does, it's surprising to see how lightly the world can take it. Current measurements are only examples of current events, and even current technology. Therefore, ideas for the future remain current too. The attempts taken to understand the future of this climatic event are tiny in comparison to what it does and could mean for Earth.

El Nino is not the only thing that influences weather, yet it cannot be overlooked. Undoubtably, as the present El Nino begins to fade, our intentions for its future should not go with it. Historical Paleoclimatic Aspects of the Southern Oscillation. New York, 1992 El Nino - Overview.

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