Figure F7. Chlorophyll contents in the Pacific equatorial region, from SeaWIFS imagery, September 1997–July 1998 composite. Chlorophyll content of surface waters correlates with high primary productivity. The position of the high-productivity (light colored) band along the equator is constrained by the change in sign of coriolis force at the equator and is a stable feature of the Cenozoic Pacific. Red = highest chlorophyll contents, Purple = lowest chlorophyll.