A5005750984- Atmospheric aerosols and clouds
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Precipitation Measurement and Analysis
- Osteoarthritis Treatment and Mechanisms
- Aeolian processes and effects
- Cryospheric studies and observations
- Icing and De-icing Technologies
- Atmospheric Ozone and Climate
- Total Knee Arthroplasty Outcomes
- Solar Radiation and Photovoltaics
- Arctic and Antarctic ice dynamics
- Knee injuries and reconstruction techniques
- Methane Hydrates and Related Phenomena
- Remote Sensing in Agriculture
- Spacecraft and Cryogenic Technologies
- Analog and Mixed-Signal Circuit Design
- Impact of Light on Environment and Health
- nanoparticles nucleation surface interactions
- Ionosphere and magnetosphere dynamics
- Numerical Methods and Algorithms
- Digital Filter Design and Implementation
- Geochemistry and Geologic Mapping
- Spaceflight effects on biology
National Institute of Information and Communications Technology
2021-2024
Japan Aerospace Exploration Agency
2016-2024
Kyushu University
2010-2016
JFE Holdings (Japan)
2012-2015
Tohoku University
2009-2010
Meteorological Research Institute
2009
National Research Institute for Earth Science and Disaster Resilience
2009
Tokai University
2003-2006
NEC (Japan)
2003
We developed a cloud mask scheme that combines measurements from CloudSat and Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observation (CALIPSO) satellites. First, we for CALIPSO using threshold of the attenuated total backscattering coefficient spatial continuity test. then combined CloudSat‐CALIPSO mask. These masks were applied to 3 months data September November 2006, vertical distributions zonal mean fractions coverage analyzed. also examined standard feature (VFM) scheme. The VFM...
A method for discriminating cloud particle types was developed using lidar backscattering copolarization and cross‐polarization channel measurements from Cloud‐Aerosol Lidar With Orthogonal Polarization (CALIOP) on board Infrared Pathfinder Satellite Observation (CALIPSO). In spaceborne measurements, significant multiple scattering effects discriminate between water ice difficult the depolarization ratio ( δ ). We theoretically estimated relationship extinction basis of backward Monte Carlo...
We describe a method to evaluate cloud microphysics simulated with global cloud‐resolving model against CloudSat and Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observation (CALIPSO) satellite data. Output from the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) is run through satellite‐sensor simulator (Joint Simulator for Sensors), then directly compared radar lidar signals CALIPSO. The forward approach allows consistency in microphysical assumption involved evaluation. To...
Abstract We compare the cloud detection and phase determination of three independent climatologies based on Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observation (CALIPSO) to airborne in situ measurements. Our analysis shows that differences between satellite measurements mainly arise from factors. First, averaging CALIPSO Level l data along track before increases estimate high‐ low‐level fractions. Second, vertical 1 tends artificially increase extent. Third, classification fully...
We developed a new radar‐lidar algorithm that can be applied to CloudSat and Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) data retrieve ice microphysics. The analyzes the specular reflection of lidar signals often observed by CALIPSO with large backscattering coefficients small depolarization ratios. Analyses our former showed problems retrieving cloud microphysics when was present. implemented additional look‐up tables for horizontally oriented plates. A mode in...
The Earth Clouds, Aerosol, and Radiation Explorer (EarthCARE) is a satellite mission jointly developed by the Japan Aerospace Exploration Agency (JAXA) European Space (ESA). One challenging feature of this observation Doppler velocity Cloud Profiling Radar (EC-CPR). measurement accuracy affected random errors induced broadening due to finite beamwidth folding caused pulse repetition frequency. We investigated impact horizontal (along-track) integration unfolding methods on reduction errors,...
Abstract Evaluation of cloud radiative effects (CREs) in global atmospheric models is vital importance to reduce uncertainties weather forecasting and future climate projection. In this paper, we describe an effective way evaluate CREs from a 3.5 km mesh nonhydrostatic model by comparing it against A‐train satellite data. The the Nonhydrostatic Icosahedral Atmospheric Model (NICAM), its output run through satellite‐sensor simulator (Joint Simulator for sensors) produce equivalent CloudSat...
Abstract This study analyzed the global and seasonal characteristics of cloud phase ice crystal orientation (CTYPE-lidar) by using Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) on board Infrared Pathfinder Satellite Observations (CALIPSO). A dataset from September 2006 to August 2007 was used derive characteristics. The discrimination scheme originally developed Yoshida et al., who classified clouds mainly into warm water, supercooled randomly oriented crystals or horizontally...
Abstract. This article gives the overview of Japan Aerospace Exploration Agency (JAXA) level 2 (L2) Standard and Research algorithms products by Japanese science teams for EarthCARE Clouds, Aerosols Radiation Explorer (EarthCARE), which is a JAXA European Space (ESA) joint satellite mission. First three single sensor 94GHz cloud profiling radar (CPR)-only, 355nm-atmospheric lidar with high spectral resolution function (ATLID)-only, multi-spectral imager (MSI)-only retrievals, their were...
Vertical and horizontal distributions of high‐level clouds (ice snow) simulated in high‐resolution global cloud system–resolving simulations by the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) are compared with satellite observations. Ice snow data a 1 week experiment NICAM 3.5 km grid mesh simulation initiated at 0000 UTC 25 December 2006 used this study. The vertical structure ice represented was Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observation (CALIPSO) CloudSat...
Abstract We examined the differences in cloud top heights (CTHs) detected by CloudSat radar and Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observation (CALIPSO) lidar. Theoretical estimates have shown that has higher sensitivity than CALIPSO does when large particles exist. In such case it might be possible CloudSat‐determined CTHs are larger CALIPSO‐determined CTHs. compared global distribution of (version 3, V3) using our mask schemes after carefully selecting data during...
Abstract The distribution of simulated cirrus clouds over the tropics is affected by particular model's vertical grid spacing. To examine this effect, we use a high‐resolution atmospheric general circulation model with 28 km and 14 horizontal meshes. We show that spacing 400 m or less necessary to resolve bulk structure clouds. As one reduces below about 1000 m, visible cloud fraction decreases, thins (optically geometrically), top height lowers, consequently, outgoing longwave radiation...
Abstract We developed a method for classifying hydrometeor particle types, including cloud and precipitation phase ice crystal habit, by synergistic use of CloudSat/Cloud Profiling Radar (CPR) Cloud‐Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO)/Cloud‐Aerosol LIdar with Orthogonal Polarization (CALIOP). investigated how the habit characterized CALIOP globally relate radar reflectivity temperature. The global relationship thus identified was employed to develop an...
Abstract. We develop the Japan Aerospace Exploration Agency (JAXA) level 2 cloud mask and type classification algorithms for Earth Clouds, Aerosols, Radiation Explorer (EarthCARE), a joint JAXA European Space (ESA) satellite mission. Cloud profiling radar (CPR)-only, atmospheric lidar (ATLID)-only, combined CPR–ATLID particle are described. The developed evaluated using ground-based data, space-borne data from CloudSat Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO)...
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The cloud top height of marine boundary layer clouds (MBLCs) in the mid-latitudes has received less attention than that subtropical MBLCs and is investigated here using mask data, which were based on observations from cloud-aerosol lidar infrared pathfinder satellite observation (CALIPSO) satellite. This study provides a comprehensive overview observational characteristics variations fog frequency over mid-latitudes. Seasonal mid-latitude as well differences these seasonal between Northern...
Abstract Changes in marine fog a warmer climate are investigated through simulations using the atmospheric component of global model, with both observed and perturbed sea surface temperature forcing. Global changes occurrence different seasons compared. We show that correspond well to horizontal advection near climate. Therefore, can be explained by large‐scale circulation changes. Regarding characteristics fog, we in‐cloud liquid water content is consistently increased climate, for given...
Abstract. The Cloud Profiling Radar (CPR) on the Earth Clouds, Aerosol, and Radiation Explorer (EarthCARE) satellite is first satellite-borne Doppler radar (EC-CPR). In our previous study, we examined effects of horizontal (along-track) integration simple unfolding methods reduction errors in EC-CPR observations, those were evaluated using two limited scenes latitude low pulse repetition frequency (PRF) settings. this amount data used was significantly increased, area extended globally. Not...
Abstract. The cloud-profiling radar (CPR) on the Earth Clouds, Aerosol, and Radiation Explorer (EarthCARE) satellite (EC-CPR) is first satellite-borne Doppler radar. In a previous study, we examined effects of horizontal (along-track) integration simple unfolding methods reduction errors in EC-CPR observations, those were evaluated using two limited scenes limited-latitude low-pulse-repetition-frequency (PRF) settings. this amount data used was significantly increased, area extended...
Abstract This study examines the characteristics of orographic ice clouds in steep mountain regions using 3 years CloudSat and CALIPSO satellite products. A combination radar lidar cloud fraction data is used to identify systems. Additionally, retrieved water content (IWC) number concentration (NI) are analyze dominant microphysics convective‐ cirrus‐type clouds. The analysis shows that temporally averaged values IWC NI larger than land ocean regions. For convective over mountains, both have...
Mineral dust suspended in the atmosphere affects Earth’s radiation budget. To accurately predict effect of on climate system, information regarding its extinction profiles is needed. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument and Infrared Pathfinder Satellite Observation (CALIPSO) satellite has enabled global observation vertical distributions aerosols clouds since June 2006. correctly retrieve coefficients from CALIOP signals, lidar-observed layers must be...
The purpose of this study is to estimate material properties articular cartilage by curve fitting method using finite element (FE) analysis. While various tests have been conducted predict the behavior cartilage, one recent interests was accurate estimation under physiological and dynamic condition. In study, cylindrical indentation experimentally in high compressive amount compression rate considering Each single specimen sequentially exposed at definite deflection with different rates...
関節軟骨は内骨格生物においてロードベアリングとしての機能に重要な役割を持つ. 関節軟骨は70～80 [wt%] の高含水の組織であり, 固液二相性材料と内部組織構造から発現される力学的特性が関節の潤滑特性に寄与する. 本稿では, ヒト関節における関節軟骨の作動条件を考慮した顕微鏡可視化力学試験により, 特に生体の実環境下における荷重条件や運動状況を考慮し, 軟骨の力学的特性を明らかにするとともに, 軟骨の内部組織構造を取入れた数値計算モデルにより固液二相性潤滑機能について解析を行った. また, バイオミメティクス的視点に立ち, 生体軟骨の解析から得られた知見を取入れた2次構造を持つ人工軟骨を作製し, 効果的に機能が発現され低摩擦係数化された内容を報告する.