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Spring 2007 Update: Annual Phytoplankton Cycle-Gulf of Maine

The annual phytoplankton cycle for the Gulf of Maine in 2006 is overlaid on the climatological cycle for comparison (see top panel). The spring bloom was earlier and had a higher than average concentration, where the fall bloom was relatively short and of average concentration. Winter and summer conditions were consistent with the long term average. Seasonal chlorophyll concentration and integrated seasonal chlorophyll concentration are presented for the five time periods used to represent the Gulf of Maine annual phytoplankton cycle (see bottom panel). Concentration showed an increase in all time periods during 2006, however, integrated concentration was extremely low for the spring and fall bloom periods reflecting the short duration of these events. Thought low values of the spring blooms does not suggest a long term trend in spring phytoplankton production, the same cannot be said of the fall bloom which appears to be in decline in terms of both concentration and magnitude over the past decade.

Historic Phytoplankton Cycles-Gulf of Maine

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