Data-based estimates of ocean carbon uptake biased high from neglect of submonthly atmospheric pressure variability

Jeanne Dombret, Hugo Bellenger, Xavier Perrot, Laëtitia Parc, Lester Kwiatkowski, Frédéric Chevallier, Laurent Bopp, Marion Gehlen, Roland Séférian, Sarah Berthet and James C. Orr. 2025. Data-based estimates of ocean carbon uptake biased high from neglect of submonthly atmospheric pressure variability. Submitted to Geophysical Research Letters. 1) NetCDF files containing the monthly means of air-sea CO2 fluxes (fCO2) using different resolutions : MONTH_MEANS_FLUX_H.nc : high frequency flux, accounting for hourly wind speed and atmospheric pressure, daily SST and 8-day SSS MONTH_MEANS_FLUX_REF.nc : reference flux, accounting only for hourly wind speed. MONTH_MEANS_FLUX_SSSM.nc : F_(P,T) , flux accounting for submonthly variability of wind speed, atmospheric pressure and SST. MONTH_MEANS_FLUX_SSSM_SSTM.nc : F_P , flux accounting for submonthly variability of wind speed and atmospheric pressure 2) NetCDF files containing the monthly means of the atmospheric component of air-sea CO2 fluxes (pCO2_atm) : F_ATM_SSSM.nc : atmospheric component of F_(P,T) F_ATM_SSTM_SSSM.nc : atmospheric component of F_P 3) SUMS_FLUX_TIME.nc : NetCDF file containing, for each month, the sum of hourly values of high-frequency air-sea CO2 flux, the sum of squared hourly values of high-frequency air-sea CO2 flux, and the sum of time steps (hours) for which the high-frequency air-sea CO2 flux is calculated. 4) NetCDF files containing different components of the Reynolds decomposition of the high-frequency air-sea CO2 flux : REYNOLDS_K.nc : NetCDF file containing the monthly means of ocean and atmosphere CO2 fugacities (pCO2_sea_mean and pCO2_atm_mean), among other unused variables. REYNOLDS_K.nc : NetCDF file containing : monthly means of the squared wind speed anomaly : U_squared monthly means of the covariance between wind speed and atmospheric CO2 fugacity : U_pCO2_atm monthly means of the covariance between wind speed and oceanic CO2 fugacity : U_pCO2_sea monthly means of the third-order mixed moment of wind speed and atmospheric CO2 fugacity : U2_pCO2_atm monthly means of the third-order mixed moment of wind speed and oceanic CO2 fugacity : U2_pCO2_sea monthly mean of wind speed : U_mean monthly mean of a*((Sc/660)^(-1/2))*K0 : A_mean