2:00 PM - 2:15 PM
[ACG52-14] Sea ice features on the scale of Ο(10–100) km and the local atmospheric response resolved in high-resolution NICOCO
Keywords:high-resolution global coupled model, air-sea-sea ice interaction
Thanks to the advancement in high-performance computing, a global coupled simulation with the horizontal resolution finer than 10km has become feasible. Resolving ocean and sea ice features on the scale of Ο(10–100) km could possibly improve the representation in the global atmospheric circulation because, as argued in previous studies, the fine-scale ocean and sea ice features can modulate larger-scale atmospheric circulations.
By using the Supercomputer “FUGAKU”, we conducted 40-day global coupled simulations with NICOCO, which consisted of the atmospheric model (NICAM) with 3.5km resolution and ocean model (COCO) with 0.1° resolution. In the present study, we are assessing its basic performance focusing on the Arctic region in winter through the comparison with the lower-resolution simulations.
The coupled simulations with 0.1° ocean component partly resolved sea ice features on the scale of Ο(10–100) km such as sea ice leads. Also, the sea ice edge exhibits highly meandering shape due to ocean mesoscale eddies. We also identified clear local atmospheric responses manifested as surface wind divergence, wind curl and shallow vertical motions. On the contrary, these fine-scale features are less clearly resolved in coupled simulations conducted with 14km atmosphere and 0.25° ocean components compared with the high-resolution coupled simulations. The long-term simulations and sensitivity experiments should be conducted in the future to quantify the impact of the ocean and sea ice features with the scale of Ο(10–100) km on the global circulation.
By using the Supercomputer “FUGAKU”, we conducted 40-day global coupled simulations with NICOCO, which consisted of the atmospheric model (NICAM) with 3.5km resolution and ocean model (COCO) with 0.1° resolution. In the present study, we are assessing its basic performance focusing on the Arctic region in winter through the comparison with the lower-resolution simulations.
The coupled simulations with 0.1° ocean component partly resolved sea ice features on the scale of Ο(10–100) km such as sea ice leads. Also, the sea ice edge exhibits highly meandering shape due to ocean mesoscale eddies. We also identified clear local atmospheric responses manifested as surface wind divergence, wind curl and shallow vertical motions. On the contrary, these fine-scale features are less clearly resolved in coupled simulations conducted with 14km atmosphere and 0.25° ocean components compared with the high-resolution coupled simulations. The long-term simulations and sensitivity experiments should be conducted in the future to quantify the impact of the ocean and sea ice features with the scale of Ο(10–100) km on the global circulation.