A5043194399- Climate variability and models
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Atmospheric aerosols and clouds
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Advanced Combustion Engine Technologies
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Arctic and Antarctic ice dynamics
- Vehicle emissions and performance
- Wind and Air Flow Studies
- Ocean Waves and Remote Sensing
- Atmospheric Ozone and Climate
- Chalcogenide Semiconductor Thin Films
- Radiation Therapy and Dosimetry
- Ionosphere and magnetosphere dynamics
- Climate change impacts on agriculture
- Precipitation Measurement and Analysis
- Quantum Dots Synthesis And Properties
Japan Agency for Marine-Earth Science and Technology
2015-2024
Tohoku University Hospital
2023
Tohoku University
2005-2023
Tohoku Medical Megabank Organization
2023
Tokyo University of Marine Science and Technology
2023
John Wiley & Sons (United States)
2023
Hudson Institute
2023
The University of Tokyo
1986-2015
Meteorological Research Institute
1989-2014
Kyoto University
1992-2009
Possible changes in the tropical cyclones a future, greenhouse-warmed climate are investigated using 20 km-mesh, high-resolution, global atmospheric model of MRI/JMA, with analyses focused on evaluation frequency and wind intensity. Two types 10-year experiments conducted. One is present-day experiment, other forcing higher sea surface temperature increased greenhouse-gas concentration. A comparison suggests that cyclone warm-climate experiment globally reduced by about 30% (but North...
Data from the undisturbed period of Rain in Cumulus over Ocean (RICO) field study are used to create a test case for large-eddy simulations shallow, precipitating, trade-wind cumulus.Measurements upon which based augmented by regional scale downscaling meteorological analyses so as provide forcing data consistent with measurements.Twelve simulations, wide range microphysical representations, compared each other, and independent measurements during RICO.The ensemble average plausibly...
This article reviews the development of a global non-hydrostatic model, focusing on pioneering research Non-hydrostatic Icosahedral Atmospheric Model (NICAM). Very high resolution atmospheric circulation simulations with horizontal mesh spacing approximately O (km) were conducted using recently developed supercomputers. These types specifically designed model based quasi-uniform grid structure and equation system. review describes each dynamical physical component NICAM, assimilation...
A Madden-Julian Oscillation (MJO) is a massive weather event consisting of deep convection coupled with atmospheric circulation, moving slowly eastward over the Indian and Pacific Oceans. Despite its enormous influence on many climate systems worldwide, it has proven very difficult to simulate an MJO because assumptions about cumulus clouds in global meteorological models. Using model that allows direct coupling circulation clouds, we successfully simulated slow migration event. Topography,...
Abstract Toward the achievement of reliable global kilometer‐scale (k‐scale) climate simulations, we improve Nonhydrostatic ICosahedral Atmospheric Model (NICAM) by focusing on moist physical processes. A goal model improvement is to establish a configuration that can simulate realistic fields seamlessly from daily‐scale variability climatological statistics. Referring two representative configurations present NICAM, each which has been used for climate‐scale and sub‐seasonal‐scale...
The influence of the global warming on tropical cyclones has been examined using a high resolution AGCM. Two ten-year integrations were performed with JMA model at T106 horizontal resolution. For control experiment, observed SST for period 1979-1988 is prescribed, while doubling CO2 (2 × CO2) anomaly due to estimated from coupled transient experiment (Tokioka et al. 1995) added used in experiment. results experiments show that significant reduction frequency possible response greenhouse...
A global atmospheric general circulation model, with the horizontal grid size of about 20 km, has been developed, making use Earth Simulator, fastest computer available at present for meteorological applications. We examine model's performance simulating present-day climate from small scale through by time integrations over 10 years, using a climatological sea surface temperature.Global distributions seasonal mean precipitation, air temperature, geopotential height, zonal-mean wind and...
A new version of a global coupled atmosphere-ocean general circulation model (MRI-CGCM2) has been developed at the Meteorological Research Institute (MRI). The can be used to explore climate change associated with anthropogenic forcings. We aimed reduce drawbacks former (MRI-CGCM1, Tokioka. et. al., 1996) and achieve more realistic climatic mean variability predict changes greater accuracy. In preliminary analysis control run, showed generally good performance in reproducing (including...
A 20-year integration by the nonhydrostatic icosahedral atmospheric model (NICAM) with a 14 km mesh was conducted for first time to obtain climatological mean and diurnal interannual variability of simulated atmosphere. Clouds were explicitly calculated using cloud microphysics scheme without cumulus convection scheme. The simulation performed under intercomparison project-type conditions, except that sea surface temperature nudged toward observed historical values slab ocean model. results...
Future changes in tropical cyclone (TC) activity and structure are investigated using the outputs of a 14-km mesh climate simulation. A set 30-yr simulations was performed under present-day warmer conditions nonhydrostatic icosahedral atmospheric model with explicitly calculated convection. The projected that global frequency TCs is reduced by 22.7%, ratio intense increased 6.6%, precipitation rate within 100 km TC center 11.8% conditions. These tendencies consistent previous studies...
Abstract Global cloud/cloud system-resolving models are perceived to perform well in the prediction of Madden–Julian Oscillation (MJO), a huge eastward -propagating atmospheric pulse that dominates intraseasonal variation tropics and affects entire globe. However, owing model complexity, detailed analysis is limited by computational power. Here we carry out simulation series using recently developed supercomputer, which enables statistical evaluation MJO skill costly new-generation manner...
Possible changes in the Asian summer monsoon due to increased atmospheric CO2 are investigated by an MRI global coupled atmosphere-ocean general circulation model. The (June-August) rainfall India increases significantly with warming. On other hand, wind shear index, defined as difference between 850hPa and 200hPa zonal winds over northern Indian Ocean, decreases. At 850hPa, westerly shifts northward intensifies from Sahel northwest of India, but Arabian Sea weakens. It is found that...
A global warming projection experiment was conducted on the Earth Simulator using a very high horizontal resolution atmospheric general circulation model, with 20-km grid size (the model). Such in climate model is unprecedented for projection. Experiments were by adopting time-slice method, which future changes sea surface temperature (SST) predicted an atmosphere-ocean (AOGCM) called MRI-CGCM2.3. The A1B emission scenario, proposed Intergovernmental Panel Climate Change (IPCC), assumed...
A new version of the Meteorological Research Institute (MRI) coupled general circulation model MRI-CGCM2 (MRI2.3) is developed and compared with previous (MRI2.0). The cloud scheme includes diagnostic function for amount separately specified convective layer clouds, which one major modifications contributing to improved performance. MRI2.3 exhibits better agreement observations in many aspects present-day climate simulations, including global energy budget, meridional distributions shortwave...
Influences of sea surface temperature (SST) spatial patterns and cumulus parameterizations on tropical cyclone (TC) frequency, in the context global warming impacts, are investigated using an atmospheric general circulation model at T106 horizontal resolution. Simulated TCs this high-resolution categorized into storms (TSs) depressions (TDs). Model TSs defined as with maximum wind speed more than, or equal to 16 m s−1, for experiments Arakawa-Schubert parameterization. Another threshold 14...
Abstract. The Nonhydrostatic ICosahedral Atmospheric Model (NICAM), a global model with an icosahedral grid system, has been under development for nearly two decades. This paper describes NICAM16-S, the latest stable version of NICAM (NICAM.16), modified Coupled Intercomparison Project Phase 6, High Resolution (HighResMIP). Major updates NICAM.12, previous used climate simulations, included cloud microphysics scheme and land surface model, introduction natural anthropogenic aerosols...
We examined the effect of oral intake pure glucosylceramide derived from konjac extract on skin barrier function evaluated by transepidermal water loss (TEWL) in hairless mice with sodium dodecyl sulfate (SDS)-induced roughness. The difference TEWL between SDS-treated site and untreated sites glucosylceramide-fed group was significantly lower than that control day 14 ingestion. investigated interleukin-1α (IL-1α) production mouse skin, it animals. This reduced IL-1α should contribute to...
This study presents an assessment of three‐dimensional structures hydrometeors simulated by the NICAM, global nonhydrostatic atmospheric model without cumulus parameterization, using multiple satellite data sets. A simulator package (COSP: CFMIP Observation Simulator Package) is employed to consistently compare output with ISCCP, CALIPSO, and CloudSat observations. Special focus placed on high thin clouds, which are not observable in conventional ISCCP set, but can be detected CALIPSO For...
Abstract Previous projections of the frequency tropical cyclone genesis due to global warming, even in terms sign change, depends on chosen model simulation. Here, we systematically examine projected changes cyclones using six atmospheric models with medium-to-high horizontal resolutions included sixth phase Coupled Model Intercomparison Project/High-Resolution Project. Changes could be broken down into contributions from (i) seed, a depression having closed contour sea level pressure warm...
The relationships between the natural variability and CO2-induced response over Pacific region are investigated in terms of spatial anomaly pattern SST, sea level pressure precipitation by a multi-model intercomparison analysis, based on 18-model results contributing to IPCC Fourth Assessment Report. analysis indicates that is related with model modes, ENSO AO. In tropical Pacific, an ENSO-like global warming simulated majority models, mostly El Niño-like change. Arctic region, AO-like many...
Abstract This study examines the impact of an alteration a cloud microphysics scheme on representation longwave radiative forcing (LWCRF) and its atmosphere in global cloud-system-resolving simulations. A new double-moment bulk is used, simulated results are compared with those previous study. It demonstrated that improvements within have potential to substantially improve climate The represents realistic spatial distribution fraction LWCRF, particularly near tropopause. improvement cirrus...