Internal waves are a wave phenomena in the ocean that forms between subsurface layers of

Figure 3-1-5.Upwelling as determined from thermal features in the California Current. 

water of varying density. In the open ocean, internal waves are frequently found along the main thermocline in the layer of strong vertical temperature gradient found below the surface mixed layer.

Internal waves can have a disruptive influence on underwater sound propagation and must be identified, located, and interpreted for effects on naval undersea operations.

Internal waves cannot be directly observed from satellite platforms. However, they can be indirectly detected at the surface in visual imagery. In areas of nearly calm winds and seas and where sunglint patterns are present, distinctive alternate bright and dark bands in the sunglint area indicate the presence of internal waves. Figure 3-1-6 is an enlarged view of such an occurrence.

Learning Objective: Identify methods used to differentiate sea ice from clouds and snow covered terrain as seen in satellite imagery.

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