Abiotic radiocarbon simulated in NEMO ocean model

<p>Following the Ocean Model Intercomparison Project (Orr et al., 1999, 2017), abiotic radiocarbon is simulated using&nbsp;the global ocean circulation model Nucleus for European Modelling of the Ocean (NEMO) version 3.6 (Madec, 2014), which is coupled to the Los Alamos sea-ice model (CICE, Rae et al., 2015).&nbsp;</p> <p>Simulation one, &quot;Hist&quot;, was forced with inter-annually varying JRA-55-do atmospheric reanalysis data (version 1.5, Tsujino et al., 2018), which is available for the period 1958 through 2020 at 3-hour intervals, which is cycled over 1850 to 2020; and&nbsp;with historical atmospheric CO2 and ∆14C boundary conditions.</p> <p>The other simulation (&rdquo;Hist-NYF&rdquo;) was forced with the JRA-NY atmospheric data in every year, which is a one year chunk (01-May-1990 to 30-April-1991) from JRA-55-do (version 1.3) data when major climate modes such as the North Atlantic Oscillation, Southern Oscillation and Southern Annular Mode were largely neutral.&nbsp;</p> <p>The &quot;Fix&quot; simulation ran with&nbsp;fixed atmospheric CO2 and ∆14 C boundary conditions, using 1850 values&nbsp;and&nbsp;inter-annually varying JRA-55-do atmospheric reanalysis data.</p>