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

• Main Authors: Luke Gregor, Amanda Fay
• Other Authors: Landschützer, Peter, McKinley, Galen, Gruber, Nicolas, Gehlen, Marion, Iida, Yosuke, Laruelle, Goulven, Rödenbeck, Christian, Zeng, Jiye, Roobaert, Alizee
• Format: Dataset
• Language: English
• Published: 2021
• Subjects: sea-air CO2 flux; carbon dioxide; seaflux; FCO2; RECCAP2; Hudson Bay; Hudson
• Online Access: https://zenodo.org/record/5148532; https://doi.org/10.5281/zenodo.5148532

Fluxes calculated using standardised 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 netCDFs contain the following data: fgco2_all_winds_products: the sea-air CO2 flux for all spCO2 products (6) and kws from all wind products (5). solWeis74: \(K_0\) is calculated using the Weiss (1974) parameterization with EN4 salinity and OISST temperatures kw_quadratic_scaled: \(k_w\) is calculated for winds with each being scaled independently to 14-C bomb flux estimate of 16.5 cm/hr using the quadratic formulation by Wanninkhof (1992). CCMPv2 ERA5 JRA55 NCEP1 NCEP2 spco2_SOCOM_unfilled: \(p\text{CO}_2^\text{sea}\) downloaded from various sources contains the following products: CMEMS_FFNN CSIR_ML6 JENA_MLS JMA_MLR MPI_SOMFFN NIES_FNN spco2_filler: scaled version of the Landschützer et al. (2020) climatology used to fill missing regions of spco2_SOCOM_unfilled pco2atm: \(p\text{CO}_2^\text{atm}\) is calculated from NOAA's marine boundary layer product with ERA5 mean sea level pressure corrected for pH2O ice: \([ice]\) is the ice fraction from the OISST product area_ocean: the surface area of the ocean including fractional area of the coastal regions Units are listed in the metadata of each of the netCDF variables. version 2021.04.02: removed some files that remained from v2021.02 that I didn't delete in v2021.04 version 2021.04 now extends the variables to calculate fluxes from 1982-2020. The comparison period for fluxes is now limited to 1990-2019 (30 years). The area contains coastal fraction coverage. A missing strip along the longitude 179.5°E is filled in. Negative values of pCO2 are limited to 50 µatm (primarily affects JENA in Hudson Bay). version 2021.02 calibrates kw with 14-C bomb estimated global average kw (16.5 ± 3.2 cm/hr) where the average is calculated without ice weighting (v2021.01 included ice ...