Yukio Tanaka's scientific contributions
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Publications (7)
An ocean general circulation model (OGCM) on a non-orthogonal cubic grid originally proposed by Purser and Rančić [Purser, R.J., Rančić, M.A., 1998. Smooth quasi-homogeneous gridding of the sphere, Q.J.R. Meteorol. Soc., 124, 637–647] is developed. The grid size is very homogeneous with the ratio of the minimum to the maximum grid intervals being a...
This chapter discusses the development of a parallel ocean general circulation model (OGCM) on the cubic grid. The OGCM on the cubic grid is being developed to avoid the difficulty of the severe time step constraint of the longitude-latitude grid, which is widely used in current global ocean models. The grid-size dependence of the time step length...
An ocean general circulation model optimized for high-resolution calculations has been developed and the parallel computational performance on the Earth Simulator is measured. In order to reduce the communication time of the barotropic solver, several boundary values of each domain are sent to the neighbor’s overlap region, and the time evolution o...
An Ocean General Circulation Model optimized for the Earth Simulator is developed and the parallel computational performance on the Earth Simulator is analyzed. The computation time for solving the three dimensional baroclinic equations is reduced linearly as the number of processors is increased. The computation time for solving the two dimensiona...
The mission of this project is to develop advanced climate models which have a capability to explore new arena of climate simulation study by fully utilizing the Earth Simulator. This project started at the beginning of the Earth Simulator operation and three models have been developed: a CCSR/NIES/FRCGC atmosphere-ocean-land coupled model, a cloud...
This project consists of three themes that are relatively independent. The corresponding three teams develop an integrated earth system model, a cloud-resolving atmospheric general circulation model with the icosahedral grid system, and an eddy- resolving ocean general circulation model with the cubic grid system, respectively. On the first theme,...
New atmospheric and oceanic general circulation models are being developed at Frontier Research System for Global Change. These models are based on quasi-uniform grid, i.e., icosahedral or cubic grids, and are aimed to be run with super- high resolution with a few kilometers on the globe. The atmospheric part of the model is based on the nonhydrost...
Citations
... On the other hand, they eliminate sharp angular discontinuity of the coordinate lines that exists on the gnomonic cubic grid of Sadourny (1972), which inspired this whole development. For these reasons, many authors (e.g., McGregor and Dix 2001;Adcroft et al. 2004;Muroi 2004;Tsugawa et al. 2005;Putman and Shian-Jiann 2007;Lauritzen and Nair 2008) turned their attention lately to exploitation of the rectangular QU conformal grids. Zhang and Rančić (2007) recently developed a global model of the atmosphere as a global expansion and generalization of the National Centers for Environmental Prediction (NCEP) regional Eta Model (Mesinger et al. 1988;Janjić 1990Janjić , 1994Mesinger 2000), utilizing the framework of the QU grids. ...
... In the barotropic equation solver, the ratio of the data communication time to the total elapse time is much larger than that of the baroclinic equation solver [7]. When the data size becomes small, communication time of parallel computers is determined by the latency time which does not depend on the size of the data and is not decreased when the size of the data is decreased. ...
... In what follows, we will refer to this mapping as the gnomonic projection for brevity. The overview of different gnomonic projections can be found in [11]. ...
