OCEAN HEALTH
Chlorophyll-a Concentration (CHL)
Phytoplankton standing stock by fluorescence, the early warning for harmful algal blooms. A spike paired with high nitrogen and warm water triggers a bloom advisory before the toxin assays return.
Threshold Bands
| Band | Range | State |
|---|---|---|
| Normal | < 3 | OK |
| Bloom-watch | 3–10 | WARN |
| HAB-risk | > 10 | CRIT |
Formula
Fluorometric chlorophyll-a as a proxy for phytoplankton biomass and bloom risk.