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Causative factors in climatic fluctuations

are primarily hydrodynamic in character, while longer term changes are primarily thermodynamic and depend on the boundary conditions. The boundary conditions include sea surface temperatures, the distribution of snow and ice, surface albedo, atmospheric composition, and variations in solar radiation. These boundary conditions mostly influence climate by changing the distribution of energy inputs and exchanges. Feedback mechanisms are particularly important in the amplification of small changes in the boundary conditions. Such mechanisms act as internal