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Featured researches published by Toshinori Aoyagi.


Journal of Applied Meteorology and Climatology | 2011

A Square Prism Urban Canopy Scheme for the NHM and Its Evaluation on Summer Conditions in the Tokyo Metropolitan Area, Japan

Toshinori Aoyagi; Naoko Seino

AbstractA single-layered square prism urban canopy (SPUC) scheme for the Japan Meteorological Agency nonhydrostatic model (NHM) was developed. This scheme considers the urban canopy layer with square prism–shaped buildings. The basic concept of this scheme is similar to those of the conventional energy balance models for an urban canyon structure. The scheme presented here differs slightly from them in its representation of the bulk resistance circuit and some treatments of radiation processes, however, as well as by considering the water reservoir on building surfaces. A comparison between the SPUC scheme and the existing slab scheme of the NHM was made on summer days in the Tokyo metropolitan area. The SPUC run more accurately reproduced the expected behavior of the urban canopy effect than did the slab run. The effective albedo was smaller in the SPUC run than in the slab run (the upward shortwave radiation of the SPUC run was smaller than that of the slab run). The forecast heat fluxes in the SPUC run...


RADIATION PROCESSES IN THE ATMOSPHERE AND OCEAN (IRS2016): Proceedings of the International Radiation Symposium (IRC/IAMAS) | 2017

Remote sensing of aerosol optical properties and solar heating rate by the combination of sky radiometer and lidar measurements

Rei Kudo; Tomoaki Nishizawa; Toshinori Aoyagi; Yasushi Fujiyoshi; Yuji Higuchi; Masahiko Hayashi; Atsushi Shimizu; Kazuma Aoki

The SKYLIDAR algorithm was developed to estimate the vertical profiles of aerosol optical properties from combining the measurements of the sky radiometer in SKYNET and the lidar in AD-Net. The derived parameters are the vertical profiles of extinction coefficient, single-scattering albedo, asymmetry factor, real and imaginary parts of the refractive index, and size distribution. The solar heating rate was estimated from these parameters. The algorithm was applied to the transported dust case, and the detailed vertical structures of the optical properties and the solar heating rate and their relationship were shown. For the validation of the SKYLIDAR algorithm, the vertical profile of the aerosol size distribution from the surface to the altitude of about 3 km was directly observed by the optical particle counter on board the glider. The comparison of the SKYLIDAR derived extinction coefficient with that estimated from OPC measurements showed that the SKYLIDAR result had a bias error due to the optimizati...


Journal of The Meteorological Society of Japan | 2012

Numerical Simulation of the Surface Air Temperature Change Caused by Increases of Urban Area, Anthropogenic Heat, and Building Aspect Ratio in the Kanto-Koshin Area

Toshinori Aoyagi; Nobuyuki Kayaba; Naoko Seino


urban climate | 2016

Numerical simulation of urban impact on precipitation in Tokyo: How does urban temperature rise affect precipitation?

Naoko Seino; Toshinori Aoyagi; Hiroshige Tsuguti


Atmospheric Measurement Techniques | 2016

Vertical profiles of aerosol optical properties and the solar heating rateestimated by combining sky radiometer and lidar measurements

Rei Kudo; Tomoaki Nishizawa; Toshinori Aoyagi


Journal of The Meteorological Society of Japan | 2018

Improvement of Snow Depth Reproduction in Japanese Urban Areas by the Inclusion of a Snowpack Scheme in the SPUC Model

Rui Ito; Toshinori Aoyagi; Naoto Hori; Mitsuo Oh'izumi; Hiroaki Kawase; Koji Dairaku; Naoko Seino; Hidetaka Sasaki


Journal of The Meteorological Society of Japan | 2018

Observations and Simulations of the Mesoscale Environment in TOMACS Urban Heavy Rain Events

Naoko Seino; Ryoko Oda; Hirofumi Sugawara; Toshinori Aoyagi


Atmospheric Measurement Techniques | 2018

Characteristics of aerosol vertical profiles in Tsukuba, Japan, and their impacts on the evolution of the atmospheric boundary layer

Rei Kudo; Toshinori Aoyagi; Tomoaki Nishizawa


Sola | 2017

Projection of Future Climate Change over Japan in Ensemble Simulations Using a Convection-Permitting Regional Climate Model with Urban Canopy

Akihiko Murata; Hidetaka Sasaki; Hiroaki Kawase; Masaya Nosaka; Toshinori Aoyagi; Mitsuo Oh'izumi; Naoko Seino; Fumitake Shido; Kenshi Hibino; Koji Ishihara; Hirokazu Murai; Souichirou Yasui; Shunya Wakamatsu; Izuru Takayabu


Japan Geoscience Union | 2017

Assessing the quality of snow depth simulated by NHRCM in urban areas of Japan

Rui Ito; Hiroaki Kawase; Koji Dairaku; Toshinori Aoyagi; Mitsuo Oh’izumi; Naoto Hori; Hidetaka Sasaki

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Hidetaka Sasaki

Japan Meteorological Agency

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Hiroaki Kawase

Japan Agency for Marine-Earth Science and Technology

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Rei Kudo

Japan Meteorological Agency

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Tomoaki Nishizawa

National Institute for Environmental Studies

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Hirofumi Sugawara

National Defense Academy of Japan

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Koji Dairaku

Japan Agency for Marine-Earth Science and Technology

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Ryoko Oda

Chiba Institute of Technology

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