23_global_productivity-1

23_global_productivity-1 - Global productivity GS222...

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Unformatted text preview: Global productivity GS222 Lecture 23 Overview - this lecture Upwelling (divergence) & downwelling (convergence) Coastal upwelling High latitude productivity Satellite-based estimates of chlorophyll concentration using highly sensitive ocean color sensors. Global chlorophyll concentrations Nutrient cycling photic zone aphotic zone primary production > respiration respiration > primary production organic matter nutrient deficit nutrient surplus upwelling General vertical profiles of nutrients Upwelling vs. downwelling Upwelling: vertical upward movement of water due to Ekman divergence Divergence of water at surface causes deeper water (~100-200 m) to upwell to the surface Upwelling brings cold, nutrient-rich water into the photic zone, causing thinner thermocline Downwelling: vertical downward movement of water due to Ekman convergence Convergence of water at surface prevents upwelling of cold, nutrient-rich water, causing thicker thermocline Divergence...
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23_global_productivity-1 - Global productivity GS222...

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