Matula says this sudden illumination happens because during the first bout of sonoluminescence, temperatures in the bubble, which can be as high as several hundred thousand degrees — hotter than the sun's surface — do something to
nitrogen and oxygen to make them form
compounds such as nitrous oxide that
dissolve in the surrounding water.
Oceanic photosynthetic organisms are not limited by
dissolved CO2, but by silicon, phosphorous, and
nitrogen compounds.