PART 3 1. B PART 4 1. Some scientists are concerned that the frequency and severity of El Nino events is increasing. Normally trade winds blow from East to West across the Pacific, and there is upwelling of cold, nutrient rich water off the West coast of South America. When El Nino occurs, the trade winds slow and the upwelling is stopped.
Warm water occurs off the Pacific coast of South America.
When you have an El Nino event, there are many effects on the ocean and the earth. Further, we would expect changes in weather over the continents, as well. In particular, the weather would be rainer over Peru and there would be drought conditions in Australia and Indonesia. Human deaths and economic costs from mudslides, floods and drought-induced fires would also be predicted. We might also expect more snowfall in the W. US and milder winters in the Northern US and Europe.