Dependence of simulated Atlantic Water inflow through the Fram Strait on horizontal resolution in the ice-ocean model (COCO)

The annual mean of potential temperature at 250 m depth in 1995 simulated by an ocean model. The model is an ocean general circulation model named COCO. The initial condition of temperature and salinity is an observation-based data (ProjD; Ishii and Kimoto, 2009; Ishii et al., 2017). The sea surface boundary condition is applied based on the JRA55-do data set (Tsujino et al., 2018). The simulation is conducted from 1980, and temperature and salinity are nudged toward the ProjD for only the first 10 years (1980-1990). We have the result for the following two horizontal resolution models. Files: t_hires.nc: The high-resolution model. The horizontal resolution spacially varies (2-3 km in the Barents Sea Opening and Fram Strait, and 3-10 km in the Nordic and Barents Seas). The map of the horizontal resolution of the model is shown in Kawasaki and Hasumi (2016). t_lowres.nc: The low-resolution model. The horizontal resolution is about 1 degree. The tripolar coordinate is utilized. This topography is also employed in the MIROC6 (one of the CMIP6 models; Tatebe et al., 2019), whose ocean component is the COCO. References: Ishii, M., and M. Kimoto, 2009: Reevaluation of historical ocean heat content variations with time-varying XBT and MBT depth bias corrections. J. Oceanography, 65, 287-299. https://doi.org/10.1007/s10872-009-0027-7 Ishii, M., Y. Fukuda, S. Hirahara, S. Yasui, T. Suzuki, and K. Sato, 2017: Accuracy of Global Upper Ocean Heat Content Estimation Expected from Present Observational Data Sets. SOLA, 13, 163-167. https://doi.org/10.2151/sola.2017-030 Tsujino, H., et al. (30 authors), 2018: JRA-55 based surface dataset for driving ocean–sea-ice models (JRA55-do). Ocean Modelling, 130, 79-139. https://doi.org/10.1016/j.ocemod.2018.07.002 Kawasaki, T., and H. Hasumi, 2016: The inflow of Atlantic water at the Fram Strait and its interannual variability. J. Geophys. Res. Oceans, 121, 502-519. https://doi.org/10.1002/2015JC011375 Tatebe, H., et al. (24 authors), 2019: Description and basic evaluation of simulated mean state, internal variability, and climate sensitivity in MIROC6, Geosci. Model Dev., 12, 2727–2765. https://doi.org/10.5194/gmd-12-2727-2019