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The seasonal evolution of the chlorophyll a concentration

 

Evolution saisonnière de la concentration de chlorophylle-a vue par un satellite "couleur de l'eau" (SeaWifs) en Atlantique Nord.

 

 

The seasonal evolution of the chlorophyll a concentration as seen by an «ocean color» satellite (SeaWiFS) in the North Atlantic Ocean.

Note that:

  1. The satellite has « difficulties to see » high latitudes in winter (this explains the white patches in the north).
  2. The phytoplankton bloom starts in May-June.
  3. The subtropical gyre (in blue color, around the latitudes 25-30°N) is a “desert” zone that becomes larger and poorer during summer.

 

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