SeaFlux: harmonised sea-air CO2 fluxes from surface pCO2 data products using a standardised approach

Fluxes calculated using the standardized approach: \(F\text{CO}_2=K_0 \cdot K_w \cdot (p\text{CO}_2^\text{sea} - p\text{CO}_2^\text{atm})\ \cdot (1 - [ice])\). We provide each of the components to this equation to reduce the potential for errors in fluxes due to methodological differences. The netCDF files contain the following data: <strong>fgco2_all_winds_products: </strong>the sea-air CO2 flux for all spCO2 products (6) and <em>kw</em> from all wind products (5). <strong>fgco2_global: </strong>the globally integrated sea-air CO2 fluxes for all spCO2 products (6) and <em>kw</em> from all wind products (6) <strong>solWeis74</strong>: \(K_0\) is calculated using the Weiss (1974) parameterization with EN4 salinity and OISST temperatures <strong>kw_quadratic_scaled:</strong> \(k_w\) is calculated for winds with each being scaled independently to a 14-C bomb flux estimate of 16.5 cm/hr using the quadratic formulation by Wanninkhof (1992). CCMPv2 ERA5 JRA55 NCEP1 NCEP2 <strong>spco2_SOCOM_unfilled</strong><em>: </em>\(p\text{CO}_2^\text{sea}\) downloaded from various sources contains the following products: CMEMS_FFNN CSIR_ML6 JENA_MLS JMA_MLR MPI_SOMFFN NIES_FNN <strong>spco2_filler</strong><em>: </em>scaled version of the Landschützer et al. (2020) climatology used to fill missing regions of <em>spco2_SOCOM_unfilled</em> <strong>pco2atm: </strong>\(p\text{CO}_2^\text{atm}\) is calculated from NOAA's marine boundary layer product with ERA5 mean sea level pressure corrected for pH2O <strong>ice: </strong>\([ice]\) is the ice fraction from the OISST product <strong>area_ocean:</strong><em> </em>the surface area of the ocean including the fractional area of the coastal regions <strong><em>Units are listed in the metadata of each of the netCDF variables. </em></strong>