This online article from the NASA Giovanni visualizations website shows a very interesting analysis of chlorophyll of our plankton bloom in 2012.  The author, James Acker, makes some fascinating observations of ocean biology including an abundance of cocolithophores (phytoplankton), and whether the plankton bloom was unusual for this area.  The link sometimes is slow to respond.

Iron fertilization bloom in the north Pacific Ocean, July-August 2012