SatCO2 can be used to calculate air-sea CO2 flux based on remote sensing or in-situ data, including: 1) calculation of air-sea CO2 flux based on remote sensing data (default or user-defined algorithms); 2) calculation of air-sea CO2 flux based on in-situ data with matchup remote sensing data (e g , cruise data may lack wind speed or atmospheric CO2 data); and, 3) estimation of air-sea CO2 budget by area integral of selected areas based on remote sensing or in-situ data In addition, SatCO2 contains the red tide detection module from remote sensing data This video introduces the thematic application modules in SatCO2, including air-sea CO2 flux calculation and red tide detection