Wataru Ohfuchi

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A spectral atmospheric general circulation model called AFES (AGCM for Earth Simulator) was developed and optimized for the architecture of the Earth Simulator (ES). The ES is a massively parallel vector supercomputer that consists of 640 processor nodes interconnected by a single stage crossbar network with its total peak performance of 40.96 Tflops. The(More)
[4] The AGCM we use is called AFES (AGCM for the Earth Simulator) [Ohfuchi et al., 2007]. Its horizontal resolution corresponds to ~150 km grid spacing (T79) with 48 vertical levels. Reducing the resolution by half leads to notable weakening of stormtrack activity. As in Brayshaw et al. [2008], we perform a pair of idealized AGCM experiments by placing the(More)
We have conducted high-resolution simulations with primitive equation or non-hydrostatic atmospheric, oceanic and coupled models in order to understand mechanisms of variations of the atmosphere–ocean system with relatively small spatial scales in the oceanic part. We report in this paper decadal variations in the North Pacific, Kuroshio Extension Current(More)
The Modular Ocean Model (MOM) is a hydrostatic primitive equation numerical code of use for the scientific exploration of ocean dynamics covering a broad range of space and time scales. In this article, we present an overview of the MOM effort and discuss recent developments and applications. A Community Model Code Numerical ocean modelling at NOAA's(More)
Correspondence: Tomohito.Yamada-1@nasa.gov INTRODUCTION The Sahel Africa is one of the most densely-populated regions in African continent, is meteorologically characterized as the monsoon region. The monsoon season abruptly begins in June to July from the southern region originated from the Gulf of Guinea (Sultan and Janicot 2000; Le Barbe et al. 2002).(More)
One of the issues about the Martian atmosphere is to reveal possible circulation features of small and medium scale disturbances ranging between thermal convection and baroclinic waves. In order to obtain some insights into this aspect, we are performing high resolution simulations of the Martian atmosphere by using a Mars general circulation model (GCM).(More)
21 Chapter 1 Earth Science In order to pursue better understandings and predictions of high-impact phenomena in the atmosphere and ocean mainly at mid-latitudes, we conducted simulations of a typhoon and a tornado, predictability studies of precipitation in the Sahel and the Kuroshio Extension jet, and a global atmospheric data assimilation experiment with(More)