Figure 9.20 Coastal upwelling. Wind from north Oregon- Califomia 20° 18° 16° Ekman transport To the west Thermocline Offshore current, Upwelling Continental shelf Chlorophyll Concentration b A satellite view of the U.S. west coast shows (in artificial In the Northern Hemisphere, coastal upwelling can be caused by winds from the north blowing along the west coast of a continent. Water moved offshore by Ekman transport is replaced by cold, deep, nutrient- laden water. In this diagram, temperature of the ocean surface is shown in degrees Celsius. (Vertical exaggeration ~100x.) color) the growth of small plantlike organisms stimu- lated by upwelled nutrients. The color bar indicates the concentration of chlorophyll in milligrams per cubic meter of seawater. Notice that chlorophyll concentration-and biological productivity-is highest near the coast. James Acker, Goddard Space Flight Center

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