Sea-air CO2 flux (FCO2): The total net exchange of carbon dioxide absorbed or emitted by seawater at the air-sea interface within a given spatial range and time range. The sea-to-air CO2 flux unit of this product is mmol/m2/d. A positive value represents the release of CO2 from seawater to the atmosphere, and a negative value represents the absorption of CO2 by seawater from the atmosphere.
This dataset is based on the theoretical diffusion model of CO2 at the water-air interface and is calculated using the sea-air CO2 partial pressure difference method. That is, the sea-air CO2 flux is equal to the gas transfer rate at the sea-air interface, the solubility coefficient of carbon dioxide in seawater and the sea-air CO2 flux. The product of the difference in carbon dioxide partial pressure. First, the atmospheric CO2 mole fraction (xCO2), sea surface atmospheric pressure (SLP), sea surface temperature (SST) and sea surface salinity (SSS) are used to calculate the atmospheric CO2 partial pressure; the seawater CO2 partial pressure uses the global seawater CO2 provided by the SATCO2 website The partial pressure product calculates the difference between the partial pressure of seawater and atmospheric CO2; the solubility coefficient of carbon dioxide in seawater is a function of temperature and salinity; the gas transfer rate at the sea-air interface is mainly determined by wind speed.
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