Three different glider sensors show different aspects of the bloom evolution in the top 30 meters, over the last 60 days.

Chlorophyll fluorescence, a surrogate for phytoplankton, increases and then remains steady, suggesting a saturation of the bloom in early May.

Red backscatter, however, a surrogate for particles, increases steadily, suggesting that although phytoplankton levels may have saturated, continued productivity leads to more total biomass.

Their ratio shows greater particle domination before the bloom, a brief chlorophyll dominated phase during the fastest bloom growth, and then particle domination again as other organisms grow.

Dissolved oxygen, increases to almost 10% supersaturation, then levels out and decreases slightly, presumably due to decreased primary productivity and increased respiration and/or air-sea exchange.

It will be illuminating when the power of the in situ measurements can be brought to bear on these surrogates.