The bloom can begin before open water

An ice-covered blank in an ocean-colour product does not establish an absence of phytoplankton growth. Drawing on the cited under-ice bloom review and NOAA productivity assessment, the essay follows light through snow, ice, and melt ponds, then examines nutrient supply, stratification, and mixing. Ice algae and water-column phytoplankton remain distinct sources within the food web. Hypothetical bloom calendars show how equal seasonal production can offer different feeding opportunities without demonstrating a real mismatch. The account also separates chlorophyll concentration from production rate and identifies the seasonal and ice-concentration boundaries of the satellite calculation. A stronger interpretation combines under-ice measurements and consumer observations with regional imagery, preserves missing-data meaning, and tests ecological consequences rather than assuming that more production benefits every organism.