11:45 〜 12:00
[AAS07-11] Global large ensemble simulations with a cloud-resolving atmosphere and eddy-resolving ocean model
Global large ensemble simulations over several months with a cloud-resolving (14 km resolution or finer) atmosphere, eddy-resolving (0.1 degrees resolution) ocean model, and their coupled system have become feasible thanks to the development of high-power supercomputer “Fugaku”. This is an unprecedented opportunity to explore the roles of the interaction between mesoscale atmospheric convections and ocean eddies on the global climate system.
Atmospheric convection over the tropical region can yield anomalous atmospheric circulations over the globe. Meanwhile, recent studies have shown that mesoscale ocean perturbations can trigger deep atmospheric convections, and thus exert remote and basin-scale impacts on the atmospheric circulation. Thus, it is of great importance to explore the role of the mesoscale air-sea interaction by using a global atmosphere-ocean coupled system.
We are assessing performance and utility of the high-resolution coupled system by comparing it with a lower-resolution (with a 0.25 degrees resolution ocean component) system. The representation of the mesoscale ocean features over the midlatitude regions are substantially improved in the high-resolution coupled system. Furthermore, the climatic drift in sea-surface temperature tends to be suppressed over the subtropical region, in particular the North Atlantic. These improvement in the surface ocean state can lead to better representation in the atmospheric state and better sub-seasonal to seasonal forecasts.
Atmospheric convection over the tropical region can yield anomalous atmospheric circulations over the globe. Meanwhile, recent studies have shown that mesoscale ocean perturbations can trigger deep atmospheric convections, and thus exert remote and basin-scale impacts on the atmospheric circulation. Thus, it is of great importance to explore the role of the mesoscale air-sea interaction by using a global atmosphere-ocean coupled system.
We are assessing performance and utility of the high-resolution coupled system by comparing it with a lower-resolution (with a 0.25 degrees resolution ocean component) system. The representation of the mesoscale ocean features over the midlatitude regions are substantially improved in the high-resolution coupled system. Furthermore, the climatic drift in sea-surface temperature tends to be suppressed over the subtropical region, in particular the North Atlantic. These improvement in the surface ocean state can lead to better representation in the atmospheric state and better sub-seasonal to seasonal forecasts.