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誌上（論文）
Anand, A., R. Imasu, S. K. Dhaka and P. K. Patra, Domain Adaptation and Fine-Tuning of a Deep Learning Segmentation Model of Small Agricultural Burn Area Detection Using High-Resolution Sentinel-2 Observations: A Case Study of Punjab, India, Remote Sens., 17(6), 974; doi:10.3390/rs17060974, 2025.
Shristy Malik, A. S. Rao, Surendra K. Dhaka, Ryoichi Imasu, H. -Y. Chun, Solar Cycle Influence on Wind, Temperature, and Surface Pressure During 1981-2021 Over Indian Region, J. Indian Soc. Remote Sens., 52, 2389-2400, doi:10.1007/s12524-024-01948-5, 2024.
Vasilyeva, D. E., E. A. Gulyaev, R. Imasu, Yu. I. Markelov, Y. Matsumi, A. V. Talovskaya, A. A. Shchelkanov & V. M. Gadelshin, A Measuring System for PM2.5 Concentration and Meteorological Parameters for a Multipoint Aerosol Monitoring Network in Yekaterinburg. Atmos. Ocean Opt., 36, 790-797, doi:10.1134/S1024856023060210, 2023.
Tanbir Singh, Yutaka Matsumi, Tomoki Nakayama, Sachiko Hayashida, Prabir K. Patra, Natsuko Yasutomi, Mizuo Kajino, Kazuyo Yamaji, Pradeep Khatri, Masayuki Takigawa, Hikaru Araki, Yuki Kurogi, Makoto Kuji, Kanako Muramatsu, Ryoichi Imasu, Anamika Ananda, Ardhi A. Arbain, Khaiwal Ravindra , Sanjeev Bhardwaj, Sahil Kumar, Sahil Mor, Surendra K. Dhaka, A. P. Dimri, Aka Sharma, Narendra Singh, Manpreet S. Bhatti, Rekha Yadav, Kamal Vatta and Suman Mor, Very high particulate pollution over northwest India captured by a high-density in situ sensor network, Sci. Rep., 13, doi:10.1038/s41598-023-39471-1, 2023.
Gogoi, M. M., S. S. Babu, R. Imasu, and M. Hashimoto, Satellite (GOSAT-2 CAI-2) retrieval and surface (ARFINET) observations of aerosol black carbon over India, Atmos. Chem. Phys., 23, 8059-8079, doi:10.5194/acp-23-8059-2023, 2023.
Imasu, R., T. Matsunaga, M. Nakajima, Y. Yoshida, K. Shiomi, I. Morino, N. Saitoh, Y. Niwa, Y. Someya, Y. Oishi, M. Hashimoto, H. Noda, K. Hikosaka,O. Uchino, S. Maksyutov, H. Takagi, H. Ishida, T. Y. Nakajima, T. Nakajima and C. Sh, Greenhouse gases Observing SATellite 2 (GOSAT-2): mission overview, PEPS, 10:33, doi:10.1186/s40645-023-00562-2, 2023.
Zadvornykh, I., K. G. Gribanov, V. Zakharov, and R. Imasu: Retrieval of HDO Relative Content in the Atmosphere from Simultaneous GOSAT-2 Measurements in the Thermal and Near-IR, Atmos. Ocean. Opt., 36, No. 2, pp. 127-131, doi:10.1134/S1024856023030120, 2023.
Wang, Qiao, R. Imasu, Y. Arai, S. Ito, Y. Mizoguchi, H. Kondo, and J. Xiao, Sub-Daily Natural CO2 Flux Simulation Based on Satellite Data: Diurnal and Seasonal Pattern Comparisons to Anthropogenic CO2 Emissions in the Greater Tokyo Area, Remote Sens., 13, 2037-2068, doi:10.3390/rs13112037, 2021.
Misra, P., Masayuki Takigawa, Pradeep Khatri, Surendra K. Dhaka, A. P. Dimri, Kazuyo Yamaji, Mizuo Kajino, Wataru Takeuchi, Ryoichi Imasu, Kaho Nitta, Prabir K. Patra, Sachiko Hayashida, Nitrogen oxides concentration and emission change detection during COVID-19 restrictions in North India, Sci. Report, 11, doi: 10.1038/s41598-021-87673-2, 2021.
Zadvornykh, I., K. G. Gribanov, N. Yu Denisova, V. Zakharov, R. Imasu, Method for Retrieval of the HDO/H2O Ratio Vertical Profile in the Atmosphere from Satellite Spectra Simultaneously Measured in Thermal and Near-IR Ranges, Atmos. Oceanic Opt., 34, 81-86, 2021.
Misra, P., R. Imasu, S. Hayashida, A. Arbain, R. Avtar, W. Takeuchi, Mapping Brick Kilns to Support Environmental Impact Studies around Delhi using Sentinel-2, Int. J. Geo-Info., 9, 544, doi:10.3390/ijgi9090544, 2020.
Misra, P., Ryoichi Imasu, Wataru Takeuchi, Impact of Urban Growth on Air Quality in Indian Cities Using Hierarchical Bayesian Approach, Atmosphere, 10, doi.org/10.3390/atmos10090517, 2019.
Someya, Y., R. Imasu, K. Shiomi, and N. Saitoh, Atmospheric ammonia retrieval from the TANSO-FTS/GOSAT thermal infrared sounder, Atmos. Meas. Tech., 13, 309-321, doi:10.5194/amt-13-309-2020, 2020.
Zadvornykh, I. V., K. G. Gribanov, V. I. Zakharov, and R. Imasu, Methane Vertical Profile Retrieval from the Thermal and Near-Infrared Atmospheric Spectra, Atmos. Ocean. Opt., 2019, 32, No. 2, pp. 152-157, doi: 10.1134/S1024856019020179, 2019.
Sato, T.O., Takao M. Sato, Hideo Sagawa, Katsuyuki Noguchi, Naoko Saitoh, Hitoshi Irie, Kazuyuki Kita, Mona E. Mahani, Koji Zettsu, Ryoichi Imasu, Sachiko Hayashida, Yasuko Kasai, Vertical profile of tropospheric ozone derived from synergetic retrieval using three different wavelength ranges, UV, IR, and microwave: sensitivity study for satellite observation, Atmos. Meas. Tech., 11, 1653-1668, 2018.
Ogawa, T., H. Shimoda, M. Hayashi, R. Imasu. A. Ono, S. Nishinomiya, and H. Kobayashi, IMG, Interferometric Measurement of Greenhouse Gases from Space, Global Change, Space Obs., 14(1) 25-28 1993.
Zadvornykh, I. V., K. G. Gribanov, V. I. Zakharov, R. Imasu, Radiative Transfer Code for the Thermal and Near-Infrared Regions with Multiple Scattering, Atmos. Oceanic Opt., 30, 305-310, 2017
Ouchi, M., Y. Matsumi, T. Nakayama, K. Shimizu, T. Sawada, T. Machida, H. Matsueda, Y. Sawa, I. Morino, O. Uchino, T. Tanaka, and R. Imasu, Development of a balloon-borne instrument for CO2 vertical profile observations in the troposphere, Atmos. Meas. Tech., 12, 5639-5653, doi:10.5194/amt-12-5639-2019, 2019.
Someya, Y., R. Imasu and K. Shiomi, Dust Aerosol Detection by the Modified CO2 Slicing Method, Sensors 2019, 19(7), 1615; doi:10.3390/s19071615, 2019.
Misra, Prakhar, Ryoichi Imasu, and Wataru Takeuchi, Impact of Urban Growth on Air Quality in Indian Cities Using Hierarchical Bayesian Approach, Atmosphere, 10, 517, doi:10.3390/atmos10090517, 2019.
Xiu-Chun Qin, T. Nakayama, Y. Matsumi, M. Kawasaki, R. Imasu, I. Morino, Y. Tanaka, S. Ishidoya, K. Sato, M. Ohashi, Observation of column-averaged molar mixing ratios of carbon dioxide in Tokyo, Atmos. Env.:X2, doi:10.1016/j.aeaoa.2019.100022, 2019.
Gupta. A., S. K. Dhaka, Y. Matsumi, R. Imasu, S. Hayashida and Vir Singh, Seasonal and annual variation of AIRS retrieved CO2, over India during 2003-2011, J. Earth Syst. Sci., 128:92, doi:10.1007/s12040-019-1108-7, 2019.
Iwasaki C., Ryoichi Imasu, Andrey Bril, Sergey Oshchepkov, Yukio Yoshida, Tatsuya Yokota, Vyacheslav Zakharov, Konstantin Gribanov and Nikita Rokotyan, Optimization of the Photon Path Length Probability Density Function-Simultaneous (PPDF-S) Method and Evaluation of CO2 Retrieval Performance Under Dense Aerosol Conditions, Sensors, 19, doi:10.3390/s19051262, 2019.
Raman Solanki, Narendra Singh, N. V. P. Kiran Kumar, K. Rajeev, Ryoichi Imasu, S. K. Dhaka, Impact of Mountainous Topography on Surface-Layer Parameters During Weak Mean-Flow Conditions, Boundary-Layer Meteor., 170, p.1-16, doi:10.1007/s10546-019-00438-3, 2019.
Imasu R. and Y. Tanabe, Diurnal and Seasonal Variations of Carbon Dioxide (CO2) Concentration in Urban, Suburban, and Rural Areas around Tokyo, Atmosphere, 9(10), 367, doi:10.3390/atmos9100367, 2018.
Bril, A., S. Maksyutov, S. Oshchepkov, Y. Yoshida, R. Imasu, C. Iwasaki, A. Chaikovsky, A. Fedarenka, Development of the empirical orthogonal functions-based algorithm for the retrievals of atmospheric CO2 total column amount from space-borne observations of reflected sunlight, J. Appl. Remote Sens. 12(4), 046012, doi: 10.1117/1.JRS.12.046012, 2018.
Iriana, W., K. Tonokura, G. Inoue, M. Kawasaki, O.Kozan, K. Fujimoto, M. Ohashi, I. Morino, Y. Someya, R. Imasu, M. Arif Rahman, and D. Gunawan, Ground-based measurements of column-averaged carbon dioxide molar mixing ratios in a peatland fire-prone area of Central Kalimantan, Indonesia, Nature Sci. Rep., doi:10.1038/s41598-018-26477-3, 2018.
Qin, X. C., T. Nakayama, Y. Matsumi, M. Kawasaki, A. Ono, S. Hayashida, R. Imasu, L.P. Lei, I. Murata, T. Kuroki, M. Ohashi, Ground-based measurement of column-averaged mixing ratios of methane and carbon dioxide in the Sichuan Basin of China by a desktop optical spectrum analyzer, J. Appl. Remote Sens., doi:10.1117/1.JRS.12.012002, 2017.
Iwasaki, C., R. Imasu, A. Bril, T. Yokota, Y. Yoshida, I. Morino, S. Oshchepkov, D. Wunch, D. W. T. Griffith, N. M. Deutscher, R. Kivi, D. Pollard, C. M. Roehl, V. A. Velazco, R. Sussmann, T. Warneke, and J. Notholt，Validation of GOSAT SWIR XCO2 and XCH4 Retrieved by PPDF-S Method and Comparison with Full Physics Method, SOLA, 13, 168-173, doi:10.2151/sola.2017-031, 2017.
Saitoh, N., S. Kimoto, R. Sugimura, R. Imasu, K. Shiomi, A. Kuze, Y. Niwa, T. Machida, Y. Sawa, and H. MatsuedaN., Bias assessment of lower and middle tropospheric CO2 concentrations of GOSAT/TANSO-FTS TIR version 1 product, Atmos. Meas. Tech., 10, 3877-3892, doi:10.5194/amt-10-3877-2017, 2017.
Kasai, Y., T. O. Sato, T. M. Sato, H. Sagawa, K. Noguchi, N. Saitoh, H. Irie, K. Kita, M. E. Mahani, K. Zettsu, R. Imasu, and S. Hayashida, Vertical profile of tropospheric ozone derived from synergetic retrieval using three different wavelength ranges, UV, IR, and Microwave: sensitivity study for satellite observation, Atmos. Meas. Tech., 10, doi:10.5194/amt-2017-98, 2017.
Niwa, Y., Y. Fujii, Y. Sawa, y. Iida, A. Ito, M. Satoh, R. Imasu, K. Tsuboi, H. Matsueda, and N. Saigusa, A 4D-Var inversion system based on the icosahedral grid model (NICAM-TM 4D-Var v1.0): 2. Optimization scheme and identical twin experiment of atmospheric CO2 inversion, Geosci. Model Devel., 10, 2201-2219, 10.5194/gmd-10-2201-2017, 2017.
Niwa, Y., H. Tomita, M. Satoh, R. Imasu, Y. Sawa, K. Tsuboi, H. Matsueda, T. Machida, M. Sasakawa, B. Belan, and N. Saigusa, A 4D-Var inversion system based on the icosahedral grid model (NICAM-TM 4D-Var v1.0): 1. Off-line forward and adjoint transport models, Geosci. Model Devel., 10, 1157-1174, doi:10.5194/gmd-10-1157-2017, 2017.
Saitoh, N., S. Kimoto, R. Sugimura, R. Imasu, S. Kawakami, K. Shiomi, A. Kuze, T. Machida, Y. Sawa, and H. Matsueda, Algorithm update of the GOSAT/TANSO-FTS thermal infrared CO2 product (version 1) and validation of the UTLS CO2 data using CONTRAIL measurements, Atmos. Meas. Tech., 9, 2119-2134, doi:10.5194/amt-9-2119-2016, 2016.
Someya, Y., R. Imasu, N. Saitoh, Y. Ota, and K. Shiomi, A development of cloud top height retrieval using thermal infrared spectra observed with GOSAT and comparison with CALIPSO data, Atmos. Meas. Tech., 9, 1981-1992, doi:10.5194/amt-9-1981-2016, 2016.
Ota, Y. and R. Imasu, Optimal Estimation of CO2 using Thermal Infrared Radiation Observation by Interferometric Monitor for Greenhouse Gases (IMG) onboard Advanced Earth Observing Satellite (ADEOS), J. Meteor. Soc. Japan, 94, 471-490, doi:10.2151/jmsj.2016-027, 2016.
Zakharov V.I., Gribanov K.G., Imasu R., Noone D, Method of principal components for inverse problem of satellite sounding of heavy water in the atmosphere, Atmos. Ocean. Opt., 29, 608-614, doi:10.15372/AOO20160713, 2016.
中島映至, 今須良一, 他, 大気環境物質のためのシームレス同化システム構築とその応用, 大気環境物質のためのシームレス同化システム構築とその応用, 日本シミュレーション学会誌「シミュレーション」, 34, 1-11, 2015.
Rokotyan, N.V., R. Imasu, V. I. Zakharov, K. G. Gribanov, and M. Yu. Khamatnurova, The Amplitude of the CO2 Seasonal Cycle in the Atmosphere of the Ural Region Retrieved from GroundBased and Satellite NearIR Measurements, Atmos. Oceanic Opt., 28, 49-55, 2015.
Rokotyan, N. V., V. I. Zakharov, K. G. Gribanov, M. Schneider, F.-M. Bréon, J. Jouzel, R. Imasu, M. Werner, M. Butzin, C. Petri, T. Warneke, and J. Notholt, A posteriori calculation of δ18O and δD in atmospheric water vapour from ground-based near-infrared FTIR retrievals of H216O, H218O, and HD16O, Atmos. Meas. Tech., 7, 2567-2580, doi:10.5194/amt-7-2567-2014, 2014.
染谷有, 今須良一, 太田芳文, 齋藤尚子, TANSO-FTS/GOSAT による熱赤外スペクトルデータを用いた南極域における極成層圏雲の観測, 日本リモートセンシング学会誌, 34, 293-305, 2014.
Ricaud, P., B. Sič, L. El Amraoui, J.-L. Attié, R. Zbinden, P. Huszar, S. Szopa, J. Parmentier, N. Jaidan, M. Michou, R. Abida, F. Carminati, D. Hauglustaine, T. August, J. Warner, R. Imasu, N. Saitoh, and V.-H. Peuch, Impact of the Asian monsoon anticyclone on the variability of mid-to-upper tropospheric methane above the Mediterranean Basin, Atmos. Chem. Phys., 14, 11427-11446, doi:10.5194/acp-14-11427-2014, 2014.
Niwa, Y., T. Machida, Y. Sawa, H. Matsueda, T. Schuck, C. A. M. Brenninkmeijer, R. Imasu, M. Satoh, Imposing strong constraints on tropical terrestrial CO2 fluxes using passenger aircraft based measurements, J. Geophys. Res., doi:10.1029/2012JD017474, 2012.
Saitoh, N., M. Touno, S. Hayashida, R. Imasu, K. Shiomi, T. Yokota, Y. Yoshida, T. Machida, H. Matsueda, and Y. Sawa, Comparisons between XCH4 from GOSAT Shortwave and Thermal Infrared Spectra and Aircraft CH4 Measurements over Guam, SOLA, 8, 145−149, doi:10.2151/sola.2012-036, 2012.
Niwa, Y., P. K. Patra, Y. Sawa, T. Machida, H. Matsueda, D. Belikov, T. Maki, M. Ikegami, R. Imasu, S. Maksyutov, T. Oda, M. Satoh, M. Takigawa, Three-dimensional variations of atmospheric CO2: aircraft measurements and multi-transport model simulations, Atmos. Chem. Phys., 11, 13359-13375, doi:10.5194/acp-11-13359-2011, 2011.
Niwa, Y., H. Tomita, M. Satoh and R. Imasu, A Three-Dimensional Icosahedral Grid Advection Scheme Preserving Monotonicity and Consistency with Continuity for Atmospheric Tracer Transport, J. Meteol. Soc. Japan, 89, 255-268, doi:10.2151/jmsj.2011-306, 2011.
Gribanov, K. G., V.I. Zakharov, S.A. Beresnev, N.V. Rokotyan, V.A. Poddubny, R. Imasu, P.A. Chistyakov, G.G. Skorik, V.V. Vasin, Sensing HDO/H2O in the Ural’s Atmosphere Using GroundBased Measurements of IR Solar Radiation with a High Spectral Resolution, Atmos. and Oceanic Opt., 24, 369-372, 2011.
Gribanov, K. G., R. Imasu, V. I. Zakharov, Neural networks for CO2 profile retrieval from data of GOSAT/TANSO-FTS, Atmospheric and Oceanic Optics, 23, 42-47, 2010.
Saitoh, N., R. Imasu, Y. Ota, and Y. Niwa, CO2 retrieval algorithm for the thermal infrared spectra of the Greenhouse Gases Observing Satellite: Potential of retrieving CO2 vertical profile from high-resolution FTS sensor, J. Geophys. Res., 114, D17305, doi:10.1029/2008JD011500, 2009.
Patra, P. K., R. M. Law, W. Peters, C. Rödenbeck, M. Takigawa, C. Aulagnier, I. Baker, D. J. Bergmann, P. Bousquet, J. Brandt, L. Bruhwiler, P. J. Cameron-Smith, J. H. Christensen, F. Delage, A. S. Denning, S. Fan, C. Geels, S. Houweling, R. Imasu et al., TransCom model simulations of hourly atmospheric CO2: Analysis of synoptic‐scale variations for the period 2002-2003 , Global Biogeochem. Cycles, 22, GB4013, doi:10.1029/2007GB003081, 2008.
Law, R. M., W. Peters, C. Rödenbeck, C. Aulagnier, I. Baker, D. J. Bergmann, P. Bousquet, J. Brandt, L. Bruhwiler, P. J. Cameron-Smith, J. H. Christensen, F. Delage, A. S. Denning, S. Fan, C. Geels, S. Houweling, R. Imasu et al., TransCom model simulations of hourly atmospheric CO2: Experimental overview and diurnal cycle results for 2002, Global Biogeochem. Cycles, 22, GB3009, doi:10.1029/2007GB003050, 2008.
齋藤 尚子, 今須 良一, 太田 芳文, 丹羽 洋介, 温室効果ガス観測技術衛星(GOSAT)の熱赤外波長における二酸化炭素鉛直プロファイル導出アルゴリズム, 日本リモートセンシング学会誌, 28, No. 2, pp.161-177, 2008.
Zakharov, V.I., R. Imasu, K.G. Gribanov, Free energy balance at the top of the atmosphere, Atmospheric and Oceanic Optics, 21, 240-247, 2008.
Gribanov, K. G., R. Imasu, A. Yu. Toptygin, Method and results of retrieval of methane content in atmosphere of Western Siberia from AIRS data., Atmos. and Ocean Optics, 20, 881-886, 2007.
Toptygin, A. Yu, K.G. Gribanov, R. Imasu, G.A. Schmidt, V.I. Zakharov, Latitudinal distribution of vertical profiles and total column amount of HDO/H2O ratio in the atmosphere over ocean retrieved from IMG/ADEOS observations, Atmos. and Ocean Optics, 19, N10, pp.875-879, 2006.
Zakharov, V.I., R. Imasu, K.G. Gribanov, G. Hoffmann, and J. Jouzel, Latitudinal distribution of the deuterium to hydrogen ratio in the atmospheric water vapor retrieved from IMG/ADEOS data, Geophys. Res .Lett., 31, No. 12, L12104, doi:10.1029/2004GL019433, 2004.
Zhang, H., T. Nakajima, G. Sui, T. Suzuki, and R. Imasu, An optimal approach to overlapping bands with correlated K distribution method and its application to radiative calculations, J. Geophys. Res., 108, 4641, 2003.
前田高尚, 林正康, 今須良一, 王自発, 中国における硫黄酸化物の輸送沈着と海域への流出量, 環境科学会誌, 14, 491-504, 2001.
Maeda, T., M. Hayashi, R. Imasu, and Z. Wang, A model analysis of transport of sulfure oxides in China and outflow to the sea, Water, Air, and Soil Poll., 130, 355-360, doi:10.1023/A:1013820915190, 2001.
Imasu. R., Meridional Distribution Feature of Minor Constituents as Observed by IMG Sensor aboard ADEOS Satellite. Adv. Space Res., 25, 959-962, doi:10.1016/S0273-1177(99)00929-1, 2000.
Sugita, T., Y. Kondo, M. Koike, M. Kanada, N. Toriyama, H. Nakajima, T. Deshler, and R. Imasu, Balloon-borne optical counter for in situ aerosol measurements. J. Atmos. Chem., 32, 183-204, doi:10.1023/A:1006128527288, 1999.
今須良一, ＡＤＥＯＳ衛星搭載ＩＭＧセンサーによる温室効果気体測定に関する暫定解析結果. 資源と環境, 7, 13-21, 1998.
今須良一, ＩＭＧインターフェログラムデータの位相補正手法と位相誤差の反転解析結果への影響について. 日本リモートセンシング学会誌, 17, 114-121, 1997.
今須良一, 地球温暖化係数（ＧＷＰ）. 日本冷凍協会誌「冷凍」, 71, 70-76, 1996（査読あり解説記事）.
Imasu, R., A. Suga, and T. Matsuno, Radiative effects and harocarbon global warming potentials of replacement compounds for chlorofluorocarbons, J. Meteo. Soc. Japan, 73, 1123-1136, doi:10.2151/jmsj1965.73.6_1123, 1995.
Ogawa. T., H. Shimoda, M. Hayashi, R. Imasu, A. Ono, S. Nishinomiya, and H. Kobayashi, IMG, interferometric measurement of greenhouse gases from space, Adv. Space Res., 14, 25-28, doi:10.1016/0273-1177(94)90343-3, 1994.
今須良一, 特集：宇宙からの地球観測：大気成分・温度の全球観測. 日本赤外線学会誌, 3, 32-39, 1993.
今須良一, 人工衛星による大気環境のリモートセンシング. 日本分析化学会誌「ぶんせき」, 1992-10, 91-93, 1992.
今須良一, ２チャンネル赤外衛星画像を用いた大気エアロゾル高濃度域の検出. エアロゾル研究, 7, 125-134, 1992.
今須良一, 人工衛星による大気成分濃度の測定, 資源と環境, 1, 11-22, 1992.
Imasu, R. and Y. Iwasaka, A new analytical procedure to derive the scattering parameter of optically thin clouds from lidar data. J. Geomag. Geoelectr., 44, 277-287, doi:10.5636/jgg.44.277, 1992.
Imasu, R. and Y. Iwasaka, Utilization of the 4 m Microwave Telescope for the Measurement of Liquid Water Path in Cirrus Clouds. J. Meteor. Soc. Japan, 70, 123-129, doi:10.2151/jmsj1965.70.1_123, 1992.
Imasu, R. and Y. Iwasaka, Characteristics of Cirrus Clouds Observed by Laser Radar (Lidar) during the Spring of 1987 and the Winter of 1978/88. J. Meteor. Soc. Japan, 69, 401-411, doi:10.2151/jmsj1965.69.3_401, 1991.
今須良一, 岩坂泰信, 圏界面付近のエアロゾルの粒径分布と偏光解消度：ライダー観測. エアロゾル研究, 6, 45-52, 1991.
今須良一, 人工衛星による温室効果気体濃度の測定Ⅰ－測定精度および雲による影響について－. 公害, 25, 375-382, 1990.
今須良一, 岩坂泰信, ハロー現象を伴う雲のレーザ・レーダ観測, 天気, 37, 689-698, 1990.
岩坂泰信, 大和政彦, 今須良一, 小野晃, エアロゾル粒子の電子顕微鏡による形状観察と散乱光の偏光解消度との対比－室内実験－. エアロゾル研究, 3, 36-41, 1988.
Iwasaka, Y., M. Yamato, R. Imasu, and A. Ono, Transport of Asian dust (KOSA) particles; importance of weak KOSA events on the geochemical cycle of soil particles. Tellus B Chem. Phys. Meteor., 40, 494-503, doi:1p.3402/tellusb.v40i5.16017, 1988.
国際会議論文
Rokotyan, N., R. Imasu, K. Gribanov, V. Zakharov, Bottlenecks in the remote sensing of the 13CO2/12CO2 isotopic ratio from GOSAT measurements, SPIE Proceedings Article, 10466, 2017.
Zadvornykh, I.V., K.G. Gribanov, R. Imasu, GOSAT TIR and SWIR spectra analysis for CO2 and CH4 profiles retrievalSPIE, doi:10.1117/12.2249494 , 2016.
Khamtnurova, MY, K.G. Gribanov, V.I. Zakharov, R. Imasu, The development of algorithms for atmospheric methane distribution retrieval from IASI/METOP spectra and their validation with MACC/ECMWF reanalysis data, SPIE, doi:10.1117/12.2249468, 2016.
Takeuchi, W., A. Sekiyama, and R. Imasu, 2013: Estimation of global carbon emissions from wild fires in forests and croplands, IGARSS 2013, paper #2979, 1805-1808, doi: 10.1109/IGARSS.2013.6723150, 2013
Tanaka T., K. Shiomi, S. Kawakami, N. Saitoh, R. Imasu, M. Inoue, I. Morino, O. Uchino, C. Sweeney, and P. Tans, Characterization and validation of CO2 and CH4 products derived from the GOSAT thermal infrared band, SPIE, 8528, DOI: 10.1117/12.979663, 2012.
Imasu, R., Y. Hayashi, A. Inagoya, N. Saitoh, K. Shiomi, Retrieval of minor constituents from thermal infrared spectra observed by GOSAT TANSO-FTS sensor, SPIE, 7857, doi: 10.1117/12.870684, 2010.
Imasu, R., Naoko Saitoh, Kei Shiomi, Hiroshi Suto, Akihiko Kuze, and Masakatsu Nakajima, Upper atmospheric CO2 concentration retrieved from thermal infrared spectrum as observed using GOSAT TANSO-FTS (TIR) sensor, SPIE, 7474, doi：10.1117/12.830387, 2009.
Imasu, R., Naoko Saitoh, Yosuke Niwa, Hiroshi Suto, Akihiko Kuze, Kei Shiomi, Masakatsu Nakajima, Radiometric calibration accuracy of GOSAT-TANSO-FTS (TIR) relating to CO2 retrieval error, SPIE, 7149, doi：10.1117_12.806145, 2008.
Imasu, R., N. Saitoh, Y. Niwa, Retrieval performance of GOSAT thermal infrared FTS sensor for measuring CO2 concentrations, SPIE, 6744, doi:10.1117/12.737796, 2007.
Imasu, R., N. Saitoh, Y. Ota, and S. Taguchi, CO2 retrieval performance of TANSO-FTS(TIR) sensor aboard Japanese greenhouse gases observing satellite (GOSAT), XVth High Res. Molec. Spectros.-2006, Nizhny Novgorod, Russia, 18-21 July, SPIE, 6580, 6580Z-1-6580Z-6, doi:10.1117/12.724963, 2006.
Toptygin, A. Yu, K. G. Gribanov and V. I. Zakharov, Y. Kasai, A. Kagawa, Y. Murayama, R. Imasu, G.A. Schmidt, G. Hoffmann, and J. Jouzel, Method and results of retrieval of HDO/H2O in atmosphere from IMG/ADEOS and FTIR data, SPIE, 6580, 65800X-1-6580X-6, doi:10.1117/12.724949, 2006.
Saitoh, N., Y. Ota, S. Taguchi, R. Imasu, Assessment of uncertainty in CO2 concentrations retrieved from thermal infrared spectra of GOSAT satellite, SPIE, 6405, 640508-1-640508-10, doi:10.1117/12.693803, 2006.
Imasu, R and Y. Ota, CO2 columnar amount retrieved from thermal infrared spectra observed by IMG/ADEOS, SPIE, 5655, 106-113, doi:10.1117/12.578775, 2004.
Ota, Y. and R. Imasu, Temperature and water vapor retrieval from IMG/ADEOS spectrum data, SPIE, 5655, 437-444, doi:10.1117/12.578629, 2004.
Toptygin, A., K. G. Gribanov, R. Imasu, W. Bleuten, and V. I. Zakharov, Seasonal methane content in atmosphere of the permafrost boundary zone in Western Siberia determined from IMG/ADEOS and AIRS/AQUA data, SPIE, 5655, 508-514 , doi:10.1117/12.579494, 2004.
Gribanov, K.G., R. Imasu, G. Schmidt, A. Toptygin, and V. I. Zakharov, Neural network retrieval of deuterium to hydrogen ratio in atmosphere from IMG/ADEOS spectra, SPIE, 5655, 515-521, doi:10.1117/12.579496, 2004.
Zakharov, V.I., R. Imasu, and K. G. Gribanov, Regarding free energy net of the earth and its monitoring from space concept, SPIE, 5655, 540-547, doi:10.1117/12.585089, 2004.
Kondo, K., R. Imasu, T. Kimura, J. Tanii, T. Nakajima, Objectives and instrument design of EarthCARE FTS, SPIE, 5152, 32-41, doi:10.1117/12.503986, 2003.
Imasu, R. and Y. Ota, Ozone retrieval from high-resolution spectrum data observed by IMG/ADEOS sensor, SPIE, 4897, 57-64, doi:10.1117/12.467727, 2003.
Zakharov, V.I., R. Imasu, and K.G. Gribanov, D/H latitudinal distribution in the atmosphere retrieved from IMG spectra, SPIE, 4897, 65-71, doi:10.1117/12.467724 2003.
Kondo, K, R. Imasu, T. Kimura, M. Suzuki, A. Kuze, and T. Ogawa, T. Nakajima, Mission objectives and instrument design concept of EarthCARE FTS, SPIE, 4897, 91-98, doi:10.1117/12.467593, 2003.
Kimura, T, K. Kondo, H. Kumagai, H. Kuroiwa, C. Ishida, R. Oki, A. Kuze, M. Suzuki, H. Okamoto, R. Imasu, T.Nakajima, EarthCARE - Earth clouds, aerosol and radiation explorer: It's objectives and Japanese sensor designs, SPIE, 4882, 510-519, doi:10.1117/12.462582, 2003.
Suzuki M. H. Kobayashi, R. Imasu, H. Shimoda, T. Ogawa, ATRAS: atmospheric radiation spectrometer results after phase A study, SPIE, 3870, 171-178, doi:10.1117/12.373175, 1999.
Suzuki, M., K. Tsuno, E. Okumura, H. Kobayashi, R. Imasu, H. Shimoda, T. Ogawa, Conceptual design study for an IMG follow-on instrument atmospheric radiation spectrometer (ATRAS) proposed for Mission Demonstration Satellite (MDS), SPIE, 3759, 118-129, doi:10.1117/12.372665, 1999.
Murayama, T., N. Sugimoto, I. Matsui, K. Arao, K. Iokibe, R. Koga, T. Sakai, Y. Kubota, Y. Saito, M. Abo, N. Hagiwara, H. Kuze, N. Kaneyasu, R. Imasu, K. Asai, and K. Aoki, Lidar network observation of Asian dust (Kosa) in Japan, SPIE, 3504, 8-15, doi:10.1117/12.319584, 1998.
Imasu, R., T. Ogawa, and H. Shimoda, Latitudinal distribution of methane as observed by IMG sensor aboard ADEOS satellite. Optical Remote Sensing of the Atmosphere and Clouds, SPIE, 3501, 84-91, doi:10.1117/12.317761, 1998.