Biology and CO2

Primary production air-sea exchange CO2. Photosynthesis fixes CO2 into organic cells. Changing dissolved inorganic C to organic biomass decreases pCO2, which promotes the drawdown of CO2 from the atmosphere. Phytoplankton utilise nitrate and increase alkaline which decrease pCO2. Biological pump: phyt. sink below seasonal thermocline and zooplankton feed and migrate dropping faeces.