Editing Agulhas Current (section)

===Primary production===
The Agulhas acts as an oceanic [[convergence zone]].  Due to [[continuity equation|mass continuity]] this drives surface waters down, resulting in the [[upwelling]] of cold, nutrient rich water south of the current.  Additionally, the convergence tends to increase the concentration of plankton in and around the Agulhas.  Both of these factors result in the area being one of enhanced [[primary production|primary productivity]] as compared to the surrounding waters.  This is especially notable in the Agulhas Retroflection waters, where chlorophyll-a concentrations tend to be significantly higher than the surrounding South Indian Ocean and South Atlantic Ocean waters.<ref name="Mann">{{Harvnb|Mann|Lazier|2006}}</ref>