They occur when the pacific ocean and the atmosphere above it change from their neutral normal state for several seasons. The pattern can shift back and forth irregularly every two to seven years, and each phase triggers predictable disruptions of temperature, precipitation, and winds. These pressure changes alter the strength of the trade winds. Enso impacts to sensible weather are typically most pronounced from late fall through mid spring. You will understand the differences between them, as well as some of their effects on both ocean waters and weather patterns on land. This needs to be recognized for scientific uses, and precision can only be achieved if the. Full text of a comprehensive etymological dictionary of. Enso especially impacts winter rainfall and temperature distribution. The strength of the animation is its ability to view changes between atmospheric pressure conditions and oceanic circulation in both the plan view and cross section. Knowledge of ensos predictability and known impacts can benefit agriculture. Oscillation, a seesaw in surface atmospheric pressure between the australianeast asian region and the eastern tropical. During e1 nina, the area of high sea surface temperatures increases, while the atmospheric convection zones of the tropical pacific expand and merge so that there is a tendency toward spatially homogeneous conditions.
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