A5038770265- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Aeolian processes and effects
- Climate variability and models
- Lightning and Electromagnetic Phenomena
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Fire effects on ecosystems
- Radioactive contamination and transfer
- Precipitation Measurement and Analysis
- Planetary Science and Exploration
- Semiconductor Quantum Structures and Devices
- Wind and Air Flow Studies
- Quantum and electron transport phenomena
- Astro and Planetary Science
- Semiconductor Lasers and Optical Devices
- Nuclear and radioactivity studies
- Photonic and Optical Devices
- Tropical and Extratropical Cyclones Research
- Solar Radiation and Photovoltaics
- Cryospheric studies and observations
- Space Exploration and Technology
- Radioactivity and Radon Measurements
- Ionosphere and magnetosphere dynamics
RIKEN Center for Computational Science
2014-2024
Hokkaido University of Science
2020-2024
Hokkaido University
2002-2024
The University of Tokyo
2005-2023
University of Washington
2023
Max Planck Institute for Meteorology
2023
Hitachi (Japan)
2020-2021
Kokusai Junior College
2020-2021
Nagoya University
1966-2020
Sendai University
2019
Abstract. We examine the influence of grid aspect ratio horizontal to vertical spacing on turbulence in planetary boundary layer (PBL) a large-eddy simulation (LES). In order clarify and distinguish them from other artificial effects caused by numerical schemes, we used fully compressible meteorological LES model with explicit scheme temporal integration. The influences are investigated series sensitivity tests parameter sweeps spatial resolution ratio. confirmed that mixing length eddy...
Aerosols affect climate by modifying cloud properties through their role as condensation nuclei or ice nuclei, called aerosol-cloud interactions. In most global models (GCMs), the interactions are represented empirical parameterisations, in which mass of liquid water (LWP) is assumed to increase monotonically with increasing aerosol loading. Recent satellite observations, however, have yielded contradictory results: LWP can decrease This difference implies that GCMs overestimate effect, but...
This study investigated the impact of several cloud microphysical schemes on trade wind cumulus in large eddy simulation model. To highlight differences due to component, we developed a fully compressible model, which excluded implicit scheme and approximations as much possible. The three schemes, one-moment bulk, two-moment spectral bin were used for sensitivity experiments other components fixed. Our new model using successfully reproduced cumuli, reliable performance was confirmed....
Abstract. Aerosol–cloud interactions are one of the most uncertain processes in climate models due to their nonlinear complexity. A key complexity arises from possibility that clouds can respond perturbed aerosols two opposite ways, as characterized by traditional “cloud lifetime” hypothesis and more recent “buffered system” hypothesis. Their importance simulations remains poorly understood. Here we investigate response liquid water path (LWP) aerosol perturbations for warm perspective...
Abstract. The Tibetan Plateau (TP) is located at the juncture of several important natural and anthropogenic aerosol sources. Satellites have observed substantial dust aerosols in atmosphere during summer over TP. These distinct effects on earth's energy balance, microphysical cloud properties, precipitation rates. To investigate transport TP, we combined Spectral Radiation-Transport Model for Aerosol Species (SPRINTARS) with a non-hydrostatic regional model (NHM). simulation shows heavily...
Abstract A model intercomparison of the atmospheric dispersion cesium‐137 ( 137 Cs) emitted after Fukushima Daiichi Nuclear Power Plant accident in Japan was conducted to understand behavior Cs greater detail. The same meteorological data with a fine spatiotemporal resolution and an emission inventory were applied all models exclude differences among originating from data. used for initial, boundary, nudging or offline field. Furthermore, horizontal grid as that adopted models. This setup...
The third model intercomparison project (MIP) for investigating the atmospheric behavior of caesium-137 (137Cs) emitted from Fukushima Daiichi Nuclear Power Plant (FDNPP) (3rd FDNPP-MIP), Japan, in March 2011, was conducted. A finer horizontal grid spacing (1 km) used than previous FDNPP-MIP (2nd FDNPP-MIP, Sato et al., 2018; 3 to evaluate models' performance high-concentration events measured near FDNPP. Nine models 2nd were also 3rd and all identical source terms meteorological fields....
Abstract. The super-droplet method (SDM) is a particle-based numerical scheme that enables accurate cloud microphysics simulation with lower computational demand than multi-dimensional bin schemes. Using SDM, detailed model of mixed-phase clouds developed in which ice morphologies are explicitly predicted without assuming categories or mass–dimension relationships. Ice particles approximated using porous spheroids. elementary processes considered advection and sedimentation;...
We wish to compensate for irregularities in the output of digital projectors that occur when they are used non-ideal situations, such as those with varying surface reflectance and ambient light. transform image be displayed into a compensation will produce desired appearance. In contrast previous methods, transformation is based on both radiometric model system content image. present five-stage framework performing content-dependent photometric compensation, details specific implementation....
Proton conductors capable of operating in the temperature range 100–600 °C have received great interest for many application areas such as fuel cells, sensors, and electrolyzers; however, very few materials that can satisfy these demands been reported to date. Here, we report a promising candidate solid electrolyte intermediate-temperature electrochemical devices. First, MP2O7–MO2 composite ceramics (M = Sn, Si, Ti, Zr) were prepared by reacting porous MO2 substrate with an 85% H3PO4...
Abstract The sensitivity of simulated nonprecipitating cumulus clouds to grid length was investigated using a large‐eddy simulation model coupled particle‐based Lagrangian cloud microphysical (LCM) and an Eulerian (ECM). For the experiment, horizontal/vertical decreased from 100/80 m 6.25/5 m. results experiment indicated similar dependency cover (CC) on in LCM ECM, which is critical for radiative properties clouds. CC increased with shorter length, numerically converged 12.5/10 m, although...
Abstract Black carbon aerosol (BCA) in the Arctic has profound impacts on global climate system through radiation processes. Despite its enormous impacts, current scale models, powerful tools for estimating overall impact, tend to underestimate levels of BCA over several seasons. Using a transport simulation with horizontal grid resolution 3.5 km, we determined that higher significantly reduced underestimation Arctic, mainly due an enhancement representation low-pressure and frontal systems....
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]Bounding aerosol radiative forcing of climate changeAuthors Nicolas Bellouin iD Johannes Quaas Ed Gryspeerdt Stefan Kinne Philip Stier Duncan Watson-Parris Olivier Boucher Ken Carslaw Matt Christensen Anne-Laure Daniau Jean-Louis Dufresne Graham Feingold Stephanie Fiedler Piers Forster Andrew Gettelman Jim Haywood Florent Malavelle Ulrike Lohmann Thorsten Mauritsen Daniel McCoy Gunnar...
In estimates of climate sensitivity obtained from global models, the need to represent clouds introduces a great deal uncertainty. To address this issue, approaches using high-resolution non-hydrostatic model are promising: captures cloud structure by explicitly simulating meso-scale convective systems, and results compare reasonably well with satellite observations. We review outcomes 5-year project aimed at reducing uncertainty in models due processes model. our project, which was...
Abstract During three winter seasons from November 2016 to March 2019, 11 gamma‐ray glows were detected at a single observation site of our ground‐based monitoring network in Kanazawa, Japan. These events are analyzed with observations an X‐band radar network, ceilometer, disdrometer, and weather monitor. All the connected convective high‐reflectivity regions more than 35 dBZ, developed up altitude >2 km. They also accompanied by heavy precipitation graupels. Therefore, graupels lower...
Abstract This study proposes using data assimilation (DA) for climate research as a tool optimizing model parameters objectively. Mitigating radiation bias is very important change assessments with general circulation models. With the Nonhydrostatic ICosahedral Atmospheric Model (NICAM), this estimated an autoconversion parameter in large‐scale condensation scheme. We investigated two approaches to reducing bias: examining useful satellite observations estimation and exploring advantages of...
Abstract. High-performance computing resources allow us to conduct numerical simulations with a horizontal grid spacing that is sufficiently high resolve cloud systems on global scale, and high-resolution models (HRMs) generally provide better simulation performance than low-resolution (LRMs). In this study, we execute next-generation model capable of simulating aerosols using version 16 the Nonhydrostatic Icosahedral Atmospheric Model (NICAM.16). The simulated aerosol distributions are...
Abstract The impact of spatial resolution on the simulation trade wind cumuli was investigated. super‐droplet method, an efficient stochastic Lagrangian cloud microphysical model, used to reduce uncertainties due empirical parameterisation microphysics and numerical diffusion for advection, which is inevitable in Eulerian model. We showed first time that cover numerically converged with a grid 12.5 m. Our refinement analysis elucidated significant contribution small cumulus clouds total...
Abstract Dust devils are one of the key elements in Martian atmospheric circulation. In order to examine their statistics, we conducted high‐resolution (up 5 m) and wide‐domain (about 20 × km 2 ) large‐eddy simulations daytime convective layer. Large numbers dust developed spontaneously simulations, which enabled us represent a quantitative consideration devil frequency distributions. We clarify distributions size intensity, topic debate, conclude that maximum vertical vorticity an...
TePixD is a blue light using flavin (BLUF) protein of thermophilic cyanobacterium, Thermosynechococcus elongatus. The fluorescence dynamics was observed for the first time in both its dark-adapted and signaling (red-shifted) forms with 200-fs resolution. up-conversion setup used region up to 60 ps, streak-camera 1 ns. To avoid accumulation red-shifted form by exciting laser irradiation, sample solution circulated diaphragm pump. A handmade flow cuvette small cross section achieve fast...
The usefulness of urinary hydrogen peroxide (H2O2) as an oxidative stress biomarker was evaluated in 766 healthy Japanese. mean level concentrations H2O2 5.66 ± 8.27 μmol/g creatinine, and significantly higher females than males. Significant correlations were observed with age, aspartate aminotransferase (AST), alanine (ALT), total cholesterol (TC), low-density lipoprotein (LDL-c), insulin, 8-hydroxy-2'-deoxyguanosine (8-OHdG), exercise habit females. In both sexes, showed a significant...