Yuichiro Hagihara

Yuichiro Hagihara
National Institute of Information and Communications Technology | NICT · Remote Sensing Laboratory

Doctor of Science

About

51
Publications
4,941
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911
Citations
Introduction
My interest is Cloud Meteorology using active sensors (Radar, Lidar) on satellite. I have been working on EarthCARE satellite mission.
Additional affiliations
May 2010 - December 2015
Kyushu University
Position
  • PostDoc Position
October 2009 - April 2010
Tohoku University
Position
  • PostDoc Position
Education
April 2005 - September 2009
Tohoku University
Field of study
  • Radiation and Climate Physics

Publications

Publications (51)
Preprint
Full-text available
We develop the Japan Aerospace Exploration Agency (JAXA) level 2 cloud mask and cloud type classification algorithms for the Earth Clouds, Aerosols, and Radiation Explorer (EarthCARE), a joint JAXA and European Space Agency (ESA) satellite mission. Cloud profiling radar (CPR)-only, atmospheric lidar (ATLID)-only, and combined CPR–ATLID algorithms f...
Preprint
Full-text available
This article gives the overview of the Japan Aerospace Exploration Agency (JAXA) level 2 (L2) Standard and Research algorithms and products by Japanese science teams for EarthCARE Clouds, Aerosols and Radiation Explorer (EarthCARE), which is a JAXA and the European Space Agency (ESA) joint satellite mission. First three single sensor algorithms for...
Article
Full-text available
The Cloud Profiling Radar (CPR) of the Earth Cloud, Aerosol and Radiation Explorer (EarthCARE) has a new capability to observe the Doppler velocity related to the vertical air motion of the terminal velocity of hydrometeors. The new observation from space will be used to evaluate and improve the model. Before the launch of EarthCARE, we need to dev...
Preprint
Full-text available
The Cloud Profiling Radar (CPR) of the Earth Cloud, Aerosol and Radiation Explorer (EarthCARE) has a new capability to observe the Doppler velocity related to the vertical air motion of the terminal velocity of hydrometeors. The new observation from space will be used to evaluate and improve the model. Before the launch of EarthCARE, we need to dev...
Article
Full-text available
The cloud-profiling radar (CPR) on the Earth Clouds, Aerosol, and Radiation Explorer (EarthCARE) satellite (EC-CPR) is the first satellite-borne Doppler radar. In a previous study, we examined the effects of horizontal (along-track) integration and simple unfolding methods on the reduction of Doppler errors in the EC-CPR observations, and those eff...
Preprint
Full-text available
The Cloud Profiling Radar (CPR) on the Earth Clouds, Aerosol, and Radiation Explorer (EarthCARE) satellite is the first satellite-borne Doppler radar (EC-CPR). In our previous study, we examined the effects of horizontal (along-track) integration and simple unfolding methods on the reduction of Doppler errors in the EC-CPR observations, and those e...
Article
Full-text available
The Earth Clouds, Aerosol, and Radiation Explorer (EarthCARE) is a satellite mission jointly developed by the Japan Aerospace Exploration Agency (JAXA) and the European Space Agency (ESA). One challenging feature of this mission is the observation of Doppler velocity by the Cloud Profiling Radar (EC-CPR). The Doppler measurement accuracy is affecte...
Article
Full-text available
This study examines the characteristics of orographic ice clouds in steep mountain regions using 3 years of CloudSat and CALIPSO satellite products. A combination of radar and lidar cloud fraction data is used to identify ice cloud systems. Additionally, the retrieved ice water content (IWC) and ice number concentration (NI) are used to analyze the...
Preprint
Full-text available
Cloud detection is the first step of any complex satellite-based cloud retrieval. No instrument detects all clouds, and analyses that use a given satellite climatology can only discuss a specific subset of clouds. We attempt to clarify which subsets of clouds are detected in a robust way by passive sensors, and which require active sensors. To do s...
Preprint
Full-text available
Cloud detection is the first step of any complex satellite-based cloud retrieval. No instrument detects all clouds, and analyses that use a given satellite climatology can only discuss a specific subset of clouds. We attempt to clarify which subsets of clouds are detected in a robust way by passive sensors, and which require active sensors. To do s...
Article
Full-text available
We developed a method for classifying hydrometeor particle types, including cloud and precipitation phase and ice crystal habit, by a synergistic use of CloudSat/Cloud Profiling Radar (CPR) and Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO)/Cloud-Aerosol LIdar with Orthogonal Polarization (CALIOP). We investigated how...
Conference Paper
We developed a test version of algorithm that discriminate cloud/precipitation phase and icecloud particle shape (hereafter, hydrometeor particle type) from the synergy use of the cloud profiling radar (CPR) onboard CloudSat satellite and the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) onboard Cloud-Aerosol Lidar and Infrared Pathfind...
Conference Paper
Super saturation of ice clouds was investigated by using CloudSat, CALIPSO and AIRS on Aqua. Global distributions of relative humidity and temperature were first retrieved by using Ishimoto 2009 AIRS algorithm that used 110 channels and 46 channels for temperature and humidity retrievals, respectively. Retrievals have been conducted between 600hPa...
Article
Full-text available
Changes in marine fog in a warmer climate are investigated through simulations using the atmospheric component of a global climate model, with both observed and perturbed sea surface temperature forcing. Global changes in marine fog occurrence in different seasons are compared. We show that the changes in marine fog occurrence correspond well to ch...
Article
Evaluation of cloud radiative effects (CREs) in global atmospheric models is of vital importance to reduce uncertainties in weather forecasting and future climate projection. In this paper, we describe an effective way to evaluate CREs from a 3.5km mesh global nonhydrostatic model by comparing it against A-train satellite data. The model is the Non...
Article
We compare the cloud detection and cloud phase determination of three independent climatologies based on Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) to airborne in situ measurements. Our analysis of the cloud detection shows that the differences between the satellite and in situ measurements mainly arise from three f...
Conference Paper
We developed lidar-radar algorithms that can be applied to Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar and CloudSat data to retrieve ice microphysics. The algorithms were the extended version of previously reported algorithm [1] and can treat both of nadir pointing of CALIPSO lidar period and 3°-off-nadir point...
Article
The distribution of simulated cirrus clouds over the tropics is affected by the particular model's vertical grid spacing. To examine this effect, we use a high-resolution atmospheric general circulation model with 28-km and 14-km horizontal meshes. We show that a vertical grid spacing of at least 400 m is necessary to resolve the bulk structure of...
Article
The cloud top height of marine boundary layer clouds (MBLCs) in the mid-latitudes has received less attention than that of subtropical MBLCs and is investigated here using cloud mask data, which were based on observations from the cloud–aerosol lidar and infrared pathfinder satellite observation (CALIPSO) satellite. This study provides a comprehens...
Article
Mineral dust suspended in the atmosphere affects the Earth’s radiation budget. To accurately predict the effect of dust on the climate system, information regarding its extinction profiles is needed. The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument on the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CAL...
Article
Full-text available
This study analyzed the global and seasonal characteristics of cloud phase and ice crystal orientation (CTYPE-lidar) by using the Cloud Aerosol Lidar with Orthogonal Polarization (CALIOP) on board the Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO). A dataset from September 2006 to August 2007 was used to derive the sea...
Article
Full-text available
[1] We examined the differences in the cloud-top heights (CTHs) detected by the CloudSat radar and Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar. Theoretical estimates have shown that CloudSat has higher sensitivity than CALIPSO does when large particles exist. In such case it might be possible that CloudSat-dete...
Article
We describe a method to evaluate cloud microphysics simulated with a global cloud-resolving model against CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite data. Output from the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) is run through a satellite-sensor simulator (Joint Simulator for Satel...
Article
We describe a method to evaluate cloud microphysics simulated with a global cloud-resolving model against CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite data. Output from the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) is run through a satellite-sensor simulator (Joint Simulator for Satel...
Conference Paper
We develop algorithms that can be applied to EarthCARE Cloud Profiling Radar (CPR) and Atmospheric backscatter LIdar (ATLID) and discuss about the expected products. EarthCARE will carry CPR and ATLID and these combination corresponds to the CloudSat and CALIPSO for the A-train. Due to the similarities between the EarthCARE and the A-train, it wil...
Conference Paper
Full-text available
We compiled the seasonal variations of the vertical distribution of clouds through a combined analysis of multiyear CloudSat cloud radar and the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) lidar observations between June 2006 and May 2010. The differences between using the previous (version 2, V2) and the latest rele...
Conference Paper
Global satellite observation provides valuable information not only to the retrievals of physical quantities relevant to aerosol and clouds but also to the evaluation of these simulated by GCMs and cloud resolving models. This paper discusses a methodology to evaluate cloud and precipitation fields simulated by a global cloud-resolving model (GCRM)...
Conference Paper
Rapid economic growth in East Asia during the past few decades have led to substantial increase in emission of aerosols and their precursors. It could have a profound impact on the energy budget and hydrological cycle in this region. More recently, chemical transport models (CTMs) have been integrated with meteorological model in the on-line manner...
Conference Paper
The radar and lidar simulator is presented for the evaluation of the cloud and aerosol microphysical properties reproduced in the models such as the AGCM and the NHM. There are two possible ways to evaluate the macro-scale and microphysical properties of clouds and aerosols simulated in the models; one is the comparison of the simulated microphysic...
Article
We developed a new radar-lidar algorithm that can be applied to CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) data to retrieve ice microphysics. The algorithm analyzes the specular reflection of lidar signals often observed by CALIPSO with large backscattering coefficients and small depolarization ratios....
Article
Full-text available
We developed a cloud mask scheme that combines measurements from CloudSat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellites. First, we developed a cloud mask scheme for CALIPSO using a threshold of the attenuated total backscattering coefficient and a spatial continuity test. We then developed a combined Clo...
Article
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 Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO). In spaceborne lidar measurements, significant multip...
Article
Full-text available
Vertical and horizontal distributions of high-level clouds (ice and snow) simulated in high-resolution global cloud system–resolving simulations by the Nonhydrostatic Icosahedral Atmospheric Model (NICAM) are compared with satellite observations. Ice and snow data in a 1 week experiment by the NICAM 3.5 km grid mesh global simulation initiated at 0...
Data
Clouds and aerosols are known to play crucial roles in the climate system; however, they are also main sources of uncertainty in our knowledge, and especially large efforts are needed to evaluate their interactions (IPCC 2007). The Japan Aerospace Exploration Agency (JAXA) is carrying out the EarthCARE (Earth Clouds, Aerosols, and Radiation Explore...
Conference Paper
Full-text available
Clouds and aerosols are known to play crucial roles in the climate system; however, they are also main sources of uncertainty in our knowledge, and especially large efforts are needed to evaluate their interactions (IPCC 2007). The Japan Aerospace Exploration Agency (JAXA) is carrying out the EarthCARE (Earth Clouds, Aerosols, and Radiation Explore...
Conference Paper
We developed the retrieval algorithm for clouds accompanying precipitation. In order to obtain the vertical structure of cloud microphysics, W‐, Ka‐ and X‐ band radars with Doppler capability were used. We first considered six different particle types and the scattering properties of the non‐spherical ice particles were calculated at these frequenc...
Conference Paper
This paper provides preliminary study of the global distribution of ice cloud properties from CloudSat. CloudSat data was analyzed using relationships between radar reflectivity (Ze) and ice cloud properties derived from ship‐borne lidar∕radar measurements [1]–[4]. The retrieval results were further compared to that obtained by a different approach...
Conference Paper
In this paper, we retrieved microphysics of water clouds from MODIS on Aqua combined with the information of cloud top height from CloudSat and CALIPSO. This approach was different from the conventional method that used cloud top height from object analysis data. For the determination of the cloud top height, we developed radar-lidar fusion cloud m...
Conference Paper
We examined the global distribution of ice cloud microphysics from CloudSat and CALIPSO in October 2006. We first developed the synergy cloud mask scheme to specify cloud pixels. Radar‐only mask was the same as in 2B‐GEOPROF for CloudSat but the lidar mask was developed and was different from the CALIPSO Vertical Feature Mask (VFM) in order to remo...
Article
We assessed the spectral imaginary part of refractive index (n(i)) of Asian dust aerosol in the visible wavelengths (0.412 - 0.865 mu m) by comparing simulated and satellite-observed top of the atmosphere (TOA) reflectances. The approach employed in this study combines the results obtained from SeaWiFS ocean color sensor, the vertical profiles prov...
Conference Paper
Asian dust aerosol layer of 4-6 km altitude accompanied by low clouds was observed with a LIDAR in Tokyo urban area on April 10 2001. In addition, column-integrated size distribution of aerosol was measured with a SkyRadiometer. To synthesize the top of atmosphere (TOA) reflectance, radiative transfer simulation was conducted assuming aerosol/cloud...

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