9:15 AM - 9:30 AM
[AAS05-02] Global ensemble simulations with a cloud-resolving atmosphere and eddy-resolving ocean coupled model
★Invited Papers
Keywords:coupled model, high horizontal resolution, air-sea interaction
An atmosphere and ocean coupled model is an essential tool for better subseasonal-to-seasonal scale prediction. Horizontal resolution of 0.1 degrees is required for the ocean component to appropriately represents the midlatitude ocean structure. Likewise, the atmospheric resolution needs to be O(10km) or finer to fully represent air-sea coupled processes that are associated with the western boundary currents and ocean eddies. In the present study, we are conducting global ensemble simulations over 40 days with our coupled model named as NICOCO by using Supercomputer “Fugaku” for the integrations (Project ID: hp200128/hp210166). In NICOCO, a cloud-resolving (3.5 km resolution) atmospheric model NICAM and eddy-resolving (0.1 degrees resolution) ocean model COCO are coupled with Jcup. Our final goal is to achieve better subseasonal-to-seasonal scale prediction with the high-resolution coupled system.
We have confirmed that the representation in the surface ocean distribution is substantially improved in the high-resolution coupled model compared with a relatively lower resolution models in which the ocean component is 0.25 degrees resolution. As consistent with previous studies, the monthly-mean ascent at ~1km height clearly reflects mesoscale sea-surface temperature perturbations associated with the Kuroshio Extension and ocean eddies. Also, the similar structures can be identified in the other midlatitude ocean regions including the Gulf Stream and Agulhas Retroflection domains. Thus, this is an unprecedented opportunity to explore the role of mesoscale air-sea interaction on the global climate system.
Acknowledgements: This work was supported by MEXT as “Program for Promoting Researches on the Supercomputer Fugaku” (JPMXP1020200305)
We have confirmed that the representation in the surface ocean distribution is substantially improved in the high-resolution coupled model compared with a relatively lower resolution models in which the ocean component is 0.25 degrees resolution. As consistent with previous studies, the monthly-mean ascent at ~1km height clearly reflects mesoscale sea-surface temperature perturbations associated with the Kuroshio Extension and ocean eddies. Also, the similar structures can be identified in the other midlatitude ocean regions including the Gulf Stream and Agulhas Retroflection domains. Thus, this is an unprecedented opportunity to explore the role of mesoscale air-sea interaction on the global climate system.
Acknowledgements: This work was supported by MEXT as “Program for Promoting Researches on the Supercomputer Fugaku” (JPMXP1020200305)