Scientists find new dimension to dynamics of Indian Ocean
They have discovered that sea level in the ocean rises and falls by up to 4 cms every 30-80 days
European Space Agency satellite uses gravity map to track ocean currents
The map is of great use for ocean monitoring and forecasting systems
Pacific Ocean weather patterns are changing — and multi-year El Nino and La Nina may become more common
Volcanic eruptions induce El Nino conditions, finds research