Akihiko Kuze
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View article: Global CH <sub>4</sub> fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH <sub>4</sub> atmospheric inverse model
Global CH <sub>4</sub> fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH <sub>4</sub> atmospheric inverse model Open
Satellite-driven inversions provide valuable information about methane (CH4) fluxes, but the assimilation of total column-averaged dry-air mole fractions of CH4 (XCH4) has been challenging. This study explores, for the first time, the pote…
View article: Global CH <sub>4</sub> Fluxes Derived from JAXA/GOSAT Lower Tropospheric Partial Column Data and the CTE-CH <sub>4</sub> Atmospheric Inverse Model
Global CH <sub>4</sub> Fluxes Derived from JAXA/GOSAT Lower Tropospheric Partial Column Data and the CTE-CH <sub>4</sub> Atmospheric Inverse Model Open
Satellite-driven inversions provide valuable information about methane (CH4) fluxes, but the assimilation of total column-averaged dry-air mole fractions of CH4 (XCH4) has been challenging. This study explores, for the first time, the pote…
View article: The Greenhouse gas Observations of Biospheric and Local Emissions from the Upper sky (GOBLEU): a mission overview, instrument description, and results from the first flight
The Greenhouse gas Observations of Biospheric and Local Emissions from the Upper sky (GOBLEU): a mission overview, instrument description, and results from the first flight Open
View article: Evaluating the JAXA GOSAT CO2 retrieval product using NASA CO2 retrieval products and NOAA Carbon Tracker
Evaluating the JAXA GOSAT CO2 retrieval product using NASA CO2 retrieval products and NOAA Carbon Tracker Open
Space-based Greenhouse Gas (GHG) observations done by Japan’s Greenhouse Gas Observing Satellite (GOSAT) and NASA’s Orbiting Carbon Observatory (OCO) missions have collected long term and spatially dense CO2 data globally. The …
View article: Updated spectral radiance calibration on TIR bands for TANSO-FTS-2 onboard GOSAT-2
Updated spectral radiance calibration on TIR bands for TANSO-FTS-2 onboard GOSAT-2 Open
The Thermal and Near-Infrared Sensor for Carbon Observation Fourier-Transform Spectrometer-2 (TANSO-FTS-2) onboard the Japanese Greenhouse Gases Observing SATellite-2 (GOSAT-2) observes a wide spectral region of the atmosphere, from the Sh…
View article: Comment on amt-2022-129
Comment on amt-2022-129 Open
Abstract. The Thermal and Near-Infrared Sensor for Carbon Observation Fourier-Transform Spectrometer-2 (TANSO-FTS-2) onboard the Japanese Greenhouse gases Observing SATellite-2 (GOSAT-2) observes a wide spectral region of …
View article: Updated spectral radiance calibration on TIR bands for the TANSO-FTS-2 onboard GOSAT-2
Updated spectral radiance calibration on TIR bands for the TANSO-FTS-2 onboard GOSAT-2 Open
The Thermal and Near-Infrared Sensor for Carbon Observation Fourier-Transform Spectrometer-2 (TANSO-FTS-2) onboard the Japanese Greenhouse gases Observing SATellite-2 (GOSAT-2) observes a wide spectral region of the atmosphere, from the Sh…
View article: Examining partial-column density retrieval of lower-tropospheric CO2 from GOSAT target observations over global megacities
Examining partial-column density retrieval of lower-tropospheric CO2 from GOSAT target observations over global megacities Open
We retrieved and examined the partial-column densities of carbon dioxide (CO2) in the lower (LT, typically 0–4 km) and upper (UT, typically 4–12 km) troposphere (XCO2LT and XCO2UT) collected over six global megacities: Beijing, New Delhi, …
View article: First Concurrent Observations of NO<sub>2</sub> and CO<sub>2</sub> From Power Plant Plumes by Airborne Remote Sensing
First Concurrent Observations of NO<sub>2</sub> and CO<sub>2</sub> From Power Plant Plumes by Airborne Remote Sensing Open
Combined NO 2 and CO 2 observations have the potential to constrain the identification of the locations and strength of urban CO 2 emissions, in particular, point sources such as power plants. We report the first results of airborne spectr…
View article: Thermal and near-infrared sensor for carbon observation Fourier transform spectrometer-2 (TANSO-FTS-2) on the Greenhouse gases Observing SATellite-2 (GOSAT-2) during its first year in orbit
Thermal and near-infrared sensor for carbon observation Fourier transform spectrometer-2 (TANSO-FTS-2) on the Greenhouse gases Observing SATellite-2 (GOSAT-2) during its first year in orbit Open
The Japanese Greenhouse gases Observing SATellite-2 (GOSAT-2), in orbit since 29 October 2018, follows up the GOSAT mission, itself in orbit since 23 January 2009. GOSAT-2 monitors carbon dioxide and methane in order to increase our unders…
View article: An 11 year record of GOSAT XCO2 measurements from NASA's ACOS version 9 retrieval algorithms: comparisons to models, TCCON, and OCO-2
An 11 year record of GOSAT XCO2 measurements from NASA's ACOS version 9 retrieval algorithms: comparisons to models, TCCON, and OCO-2 Open
<p>The GOSAT TANSO-FTS sensor has been collecting high spectral resolution measurements of reflected solar radiation in the Oxygen A-band (0.76 microns) and two shortwave-infrared carbon dioxide (CO<sub>2</sub>) absorptio…
View article: Monitoring the nations&#8217; climate mitigation progress using multi-species observations from Japanese passenger aircrafts
Monitoring the nations’ climate mitigation progress using multi-species observations from Japanese passenger aircrafts Open
<p>The greenhouse gas (GHG) emissions from cities account for more than 70% of the global emissions. Over the past decades, GHG-dedicated space-based instruments, such as Japan’s Greenhouse gases Observing SATellite (GOSAT)…
View article: Thermal and near-infrared sensor for carbon observation Fourier-transform spectrometer-2 (TANSO-FTS-2) on the Greenhouse Gases Observing Satellite-2 (GOSAT-2) during its first year on orbit
Thermal and near-infrared sensor for carbon observation Fourier-transform spectrometer-2 (TANSO-FTS-2) on the Greenhouse Gases Observing Satellite-2 (GOSAT-2) during its first year on orbit Open
The Japanese Greenhouse gases Observing SATellite-2 (GOSAT-2), in orbit since 29 October 2018, follows up the GOSAT mission, itself in orbit since 23 January 2009. GOSAT-2 monitors carbon dioxide and methane in order to increase our unders…
View article: Simulation experiments for studying an optimal carbon dioxide monitoring network for Osaka, Japan
Simulation experiments for studying an optimal carbon dioxide monitoring network for Osaka, Japan Open
<p>We prototype an Observing System Simulation Experiment (OSSE) system for studying an optimal carbon dioxide (CO2) monitoring network in Osaka city, one of the populated cities in Japan (population: 8.8 million).  In the f…
View article: Ensemble-based satellite-derived carbon dioxide and methane column-averaged dry-air mole fraction data sets (2003–2018) for carbon and climate applications
Ensemble-based satellite-derived carbon dioxide and methane column-averaged dry-air mole fraction data sets (2003–2018) for carbon and climate applications Open
Satellite retrievals of column-averaged dry-air mole fractions of carbon dioxide (CO2) and methane (CH4), denoted XCO2 and XCH4, respectively, have been used in recent years to obtain information on natural and anthropogenic sources and si…
View article: Detection of Methane Emission from a Local Source Using GOSAT Target Observations
Detection of Methane Emission from a Local Source Using GOSAT Target Observations Open
Emissions of atmospheric methane (CH4), which greatly contributes to radiative forcing, have larger uncertainties than those for carbon dioxide (CO2). The Thermal And Near-infrared Sensor for carbon Observation Fourier-Transform Spectromet…
View article: Bi-Directional Reflectance Factor Determination of the Railroad Valley Playa
Bi-Directional Reflectance Factor Determination of the Railroad Valley Playa Open
Vicarious calibration is the determination of an on-orbit sensor’s radiometric response using measurements over test sites such as Railroad Valley (RRV), Nevada. It has the highest accuracy when a remote sensor’s view angle is aligned with…
View article: Ensemble-based satellite-derived carbon dioxide and methane column-averaged dry-air mole fraction data sets (2003-2018) for carbon and climate applications
Ensemble-based satellite-derived carbon dioxide and methane column-averaged dry-air mole fraction data sets (2003-2018) for carbon and climate applications Open
Satellite retrievals of column-averaged dry-air mole fractions of carbon dioxide (CO2) and methane (CH4), denoted XCO2 and XCH4, respectively, have been used in recent years to obtain information on natural and anthropogenic sources and si…
View article: Light, Energy and the Environment, 2018: introduction to the joint feature issue
Light, Energy and the Environment, 2018: introduction to the joint feature issue Open
This joint feature issue of Optics Express and Applied Optics highlights contributions from authors who presented their latest research at the OSA Light, Energy and the Environment Congress, held in Sentosa Island, Singapore from 5 to 8 No…
View article: Concept of small satellite UV/visible imaging spectrometer optimized for tropospheric NO 2 measurements in air quality monitoring
Concept of small satellite UV/visible imaging spectrometer optimized for tropospheric NO 2 measurements in air quality monitoring Open
View article: Investigation of the Long-Term Change of the TANSO-FTS Pointing Characteristics for a Future Agile Pointing Mechanism
Investigation of the Long-Term Change of the TANSO-FTS Pointing Characteristics for a Future Agile Pointing Mechanism Open
Pointing mechanism installed on GOSAT/TANSO-FTS is one of the most essential techniques to realize optimal observation patterns on the earth and a long-term operation period. In orbit, the continuous increase of angular rate sensor cable t…
View article: Computation and analysis of atmospheric carbon dioxide annual mean growth rates from satellite observations during 2003–2016
Computation and analysis of atmospheric carbon dioxide annual mean growth rates from satellite observations during 2003–2016 Open
The growth rate of atmospheric carbon dioxide (CO2) reflects the net effect of emissions and uptake resulting from anthropogenic and natural carbon sources and sinks. Annual mean CO2 growth rates have been determined from satellite retriev…
View article: Combining airborne and ground based remote sensing (lidar, spectrometer) as well as in-situ techniques to determine CH₄ emissions of a European CH₄ emission hot spot area – initial results from COMET
Combining airborne and ground based remote sensing (lidar, spectrometer) as well as in-situ techniques to determine CH₄ emissions of a European CH₄ emission hot spot area – initial results from COMET Open
View article: Validation of mobile in situ measurements of dairy husbandry emissions by fusion of airborne/surface remote sensing with seasonal context from the Chino Dairy Complex
Validation of mobile in situ measurements of dairy husbandry emissions by fusion of airborne/surface remote sensing with seasonal context from the Chino Dairy Complex Open
View article: Computation and analysis of atmospheric carbon dioxide annual mean growthrates from satellite observations during 2003–2016
Computation and analysis of atmospheric carbon dioxide annual mean growthrates from satellite observations during 2003–2016 Open
The growth rate of atmospheric carbon dioxide (CO2) reflects the net effect of emissions and uptake resulting from anthropogenic and natural carbon sources and sinks. Annual mean CO2 growth rates have been determined globally and for selec…
View article: Imaging Spectrometer with an Agile Pointing System to Quantify Global and Regional Greenhouse Gas Fluxes and Monitor Localized Emission Sources
Imaging Spectrometer with an Agile Pointing System to Quantify Global and Regional Greenhouse Gas Fluxes and Monitor Localized Emission Sources Open
We propose an imaging grating spectrometer suite with an agile pointing system and two-dimensional detectors to monitor global and regional greenhouse gas fluxes and target local emission. Three imaging spectrometers cover the nitrogen dio…
View article: One-year operation of TANSO-FTS on GOSAT and follow-on mission feasibility
One-year operation of TANSO-FTS on GOSAT and follow-on mission feasibility Open
The Greenhouse gases Observing SATellite (GOSAT) was developed to contribute to monitoring of carbon dioxide and methane from space [1]. The mission objectives are global greenhouse gas measurements from space with precision of 1 % for CO<…
View article: The Cross-Calibration of Spectral Radiances and Cross-Validation of CO2 Estimates from GOSAT and OCO-2
The Cross-Calibration of Spectral Radiances and Cross-Validation of CO2 Estimates from GOSAT and OCO-2 Open
The Greenhouse gases Observing SATellite (GOSAT) launched in January 2009 has provided radiance spectra with a Fourier Transform Spectrometer for more than eight years. The Orbiting Carbon Observatory 2 (OCO-2) launched in July 2014, colle…
View article: Bias assessment of lower and middle tropospheric CO <sub>2</sub> concentrations of GOSAT/TANSO-FTS TIR version 1 product
Bias assessment of lower and middle tropospheric CO <sub>2</sub> concentrations of GOSAT/TANSO-FTS TIR version 1 product Open
CO2 observations in the free troposphere can be useful for constraining CO2 source and sink estimates at the surface since they represent CO2 concentrations away from point source emissions. The thermal infrared (TIR) band of the Thermal a…
View article: Aerosol Property Retrieval Algorithm over Northeast Asia from TANSO-CAI Measurements Onboard GOSAT
Aerosol Property Retrieval Algorithm over Northeast Asia from TANSO-CAI Measurements Onboard GOSAT Open
The presence of aerosol has resulted in serious limitations in the data coverage and large uncertainties in retrieving carbon dioxide (CO2) amounts from satellite measurements. For this reason, an aerosol retrieval algorithm was developed …