Tomoko AkitsuAssociate Professor
■Researcher basic information
Research Areas
Research Keyword
Career
- Oct. 2021 - Present, Japan Aerospace Exploration Agency, Earth Observation Research Center, Associate Senior Researcher
- Nov. 2019 - Sep. 2021, University of Tsukuba, Faculty of Life and Environmental Sciences, Assistant professor
- May 2010 - Oct. 2019, University of Tsukuba, Faculty of Life and Environmental Sciences, 研究員
- Apr. 2009 - Mar. 2010, National Institute of Advanced Industrial Science and Technology
- Apr. 2007 - Mar. 2009, 旭川明成高等学校
- Apr. 1992 - Dec. 1993, NEC Corporation
Member History
■Research activity information
Award
Paper
- The efficiency-level inconsistency of the SIF–GPP relationship in a subtropical evergreen forest in Okinawa, Japan
Junjie Fu; Tomomichi Kato; Tomoki Morozumi; Kazuho Matsumoto; Shingo Taniguchi; Masahito Ueyama; Kanokrat Buareal; Tatsuya Miyauchi; Naohisa Nakashima; Tomoko Kawaguchi Akitsu, Elsevier BV
Agricultural and Forest Meteorology, Mar. 2026, [Reviewed] - Modeling diurnal gross primary production in East Asia using Himawari-8/9 geostationary satellite data
Yuhei Yamamoto; Kazuhito Ichii; Wei Yang; Yui Shikakura; Youngryel Ryu; Minseok Kang; Shohei Murayama; Su-Jin Kim; Yuta Takao; Masahito Ueyama; Tomoko Kawaguchi Akitsu; Hiroki Iwata; Hojin Lee; Junghwa Chun; Atsushi Higuchi; Takashi Hirano; AReum Kim; Hyun Seok Kim; Kenzo Kitamura; Yuji Kominami; Kazuho Matsumoto; Jun Suzuki; Kentaro Takagi; Yoshiyuki Takahashi; Satoru Takanashi; Hideaki Takenaka; Shingo Taniguchi; Yukio Yasuda, Elsevier BV
Remote Sensing of Environment, Oct. 2025, [Reviewed] - The GCOM-C/SGLI vegetation indices (NDVI, PRI, Chlorophyll Index) from the viewpoint of leaf optical property
Tomoko Akitsu; Hiroshi Murakami; Atsushi Kume; Hideki Kobayashi; Roxanne Lai
20 Jan. 2025 - Across-crown and canopy variations of plant functional traits and spectra for deciduous broadleaf and evergreen coniferous species in a temperate forest
Roxanne Lai; Tatsuro Nakaji; Tomoko Kawaguchi Akitsu; Fujio Hyodo; Hibiki Noda; Hideki Kobayashi
20 Jan. 2025 - Variation in leaf mesophyll anatomy of fern species imposes significant effects on leaf gas exchange, light capture, and leaf hydraulic conductance
S. FUJII; K. NISHIDA; T.K. AKITSU; A. KUME; Y.T. HANBA, Institute of Experimental Botany
Photosynthetica, 04 May 2023 - Leaf optical properties and photosynthesis of fern species with a wide range of divergence time in relation to mesophyll anatomy.
Yuko T Hanba; Keisuke Nishida; Yuuri Tsutsui; Mayu Matsumoto; Yutarou Yasui; Yang Sizhe; Takumi Matsuura; Tomoko Kawaguchi Akitsu; Atsushi Kume, BACKGROUND AND AIMS: For a comprehensive understanding of the mechanisms of changing plant photosynthetic capacity during plant evolutionary history, knowledge of leaf gas exchange and optical properties are essential, both of which relate strongly to mesophyll anatomy. Although ferns are suitable for investigating the evolutionary history of photosynthetic capacity, comprehensive research of fern species has yet to be undertaken in this regard. METHODS: We investigated leaf optical properties, gas exchange and mesophyll anatomy of fern species with a wide range of divergence time, using 66 ferns from natural habitats and eight glasshouse-grown ferns. We used a spectroradiometer and an integrating sphere to measure light absorptance and reflectance by the leaves. KEY RESULTS: The more newly divergent fern species had a thicker mesophyll, a larger surface area of chloroplasts facing the intercellular airspaces (Sc), thicker cell walls and large light absorptance. Although no trend with divergence time was obtained in leaf photosynthetic capacity on a leaf-area basis, when the traits were expressed on a mesophyll-thickness basis, trends in leaf photosynthetic capacity became apparent. On a mesophyll-thickness basis, the more newly divergent species had a low maximum photosynthesis rate, accompanied by a low Sc. CONCLUSIONS: We found a strong link between light capture, mesophyll anatomy and photosynthesis rate in fern species for the first time. The thick mesophyll of the more newly divergent ferns does not necessarily relate to the high photosynthetic capacity on a leaf-area basis. Rather, the thick mesophyll accompanied by thick cell walls allowed the ferns to adapt to a wider range of environments through increasing leaf toughness, which would contribute to the diversification of fern species.
Annals of botany, 04 Apr. 2023, [Reviewed] - Feature-based algorithm for large-scale rice phenology detection based on satellite images
Xin Zhao; Kazuya Nishina; Tomoko Kawaguchi Akitsu; Liguang Jiang; Yuji Masutomi; Kenlo Nishida Nasahara
AGRICULTURAL AND FOREST METEOROLOGY, Feb. 2023, [Reviewed] - Contributions of the understory and midstory to total canopy solar-induced chlorophyll fluorescence in a ground-based study in conjunction with seasonal gross primary productivity in a cool-temperate deciduous broadleaf forest
Tomoki Morozumi; Tomomichi Kato; Hideki Kobayashi; Yuma Sakai; Naohisa Nakashima; Kanokrat Buareal; Kenlo Nishida Nasahara; Tomoko Kawaguchi Akitsu; Shohei Murayama; Hibiki M. Noda; Hiroyuki Muraoka, Elsevier BV
Remote Sensing of Environment, Jan. 2023, [Reviewed] - Accuracy Assessment of Photochemical Reflectance Index (PRI) and Chlorophyll Carotenoid Index (CCI) Derived from GCOM-C/SGLI with In Situ Data
Taiga Sasagawa; Tomoko Kawaguchi Akitsu; Reiko Ide; Kentaro Takagi; Satoru Takanashi; Tatsuro Nakaji; Kenlo Nishida Nasahara, The photochemical reflectance index (PRI) and the chlorophyll carotenoid index (CCI) are carotenoid-sensitive vegetation indices, which can monitor vegetation’s photosynthetic activities. One unique satellite named “Global Change Observation Mission-Climate (GCOM-C)” is equipped with a sensor, “Second Generation Global Imager (SGLI)”, which has the potential to frequently and simultaneously observe PRI and CCI over a wide swath. However, the observation accuracy of PRI and CCI derived from GCOM-C/SGLI remains unclear in forests. Thus, we demonstrated their accuracy assessment by comparing them with in situ data. We collected in situ spectral irradiance data at four forest sites in Japan for three years. We statistically compared satellite PRI with in situ PRI, and satellite CCI with in situ CCI. From the obtained results, the satellite PRI showed poor agreement (the best: r=0.294 (p<0.05)) and the satellite CCI showed good agreement (the best: r=0.911 (p<0.001)). The greater agreement of satellite CCI is possibly because satellite CCI contained fewer outliers and satellite CCI was more resistant to small noise, compared to satellite PRI. Our results suggest that the satellite CCI is more suitable for practical use than the satellite PRI with the latest version (version 3) of GCOM-C/SGLI’s products., MDPI AG
Remote Sensing, 26 Oct. 2022, [Reviewed] - Early validation study of the photochemical reflectance index (PRI) and the normalized difference vegetation index (NDVI) derived from the GCOM-C satellite in Mongolian grasslands
Undrakh Bayarsaikhan; Tomoko Kawaguchi Akitsu; Kaoru Tachiiri; Taiga Sasagawa; Tomoko Nakano; Bayar-Saikhan Uudus; Kenlo Nishida Nasahara, Corresponding, Informa UK Limited
International Journal of Remote Sensing, 12 Oct. 2022, [Reviewed] - The variability and seasonality in the ratio of photosynthetically active radiation to solar radiation: A simple empirical model of the ratio
Tomoko Kawaguchi Akitsu; Kenlo Nishida Nasahara; Osamu Ijima; Yasuo Hirose; Reiko Ide; Kentaro Takagi; Atsushi Kume, Lead, Elsevier BV
International Journal of Applied Earth Observation and Geoinformation, Apr. 2022, [Reviewed] - In-situ observations on a moderate resolution scale for validation of the Global Change Observation Mission-Climate ecological products: The uncertainty quantification in ecological reference data
Tomoko Kawaguchi Akitsu; Kenlo Nishida Nasahara, Lead
International Journal of Applied Earth Observation and Geoinformation, Mar. 2022, [Reviewed] - Area-ratio Fraunhofer line depth (aFLD) method approach to estimate solar-induced chlorophyll fluorescence in low spectral resolution spectra in a cool-temperate deciduous broadleaf forest
Naohisa Nakashima; Tomomichi Kato; Tomoki Morozumi; Katsuto Tsujimoto; Tomoko Kawaguchi Akitsu; Kenlo Nishida Nasahara; Shohei Murayama; Hiroyuki Muraoka; Hibiki M. Noda, Springer Science and Business Media LLC
Journal of Plant Research, 22 Jun. 2021, [Reviewed] - Developing a Method for Interconversion between Omnidirectional Images and Poind Cloud Data in a Sugi Forest
Taiga Sasagawa; Tomoko Kawaguchi Akitsu; Kenlo Nishida Nasahara, Japan Society of Forest Planning
Japanese Journal of Forest Planning, 31 Mar. 2021, [Reviewed] - Large‐scale ecological field data for satellite validation in deciduous forests and grasslands
Tomoko Kawaguchi Akitsu; Tatsuro Nakaji; Hajime Kobayashi; Tetsuo Okano; Yoshiaki Honda; Undrakh Bayarsaikhan; Terigele; Masato Hayashi; Tsutom Hiura; Reiko Ide; Susumu Igarashi; Koji Kajiwara; Syoji Kumikawa; Yuuichi Matsuoka; Takashi Nakano; Tomoko Nakano; Atsushi Okuda; Tomoaki Sato; Kaoru Tachiiri; Yoshiyuki Takahashi; Jiro Uchida; Kenlo Nishida Nasahara, Lead
Ecological Research, Nov. 2020, [Reviewed] - Field data for satellite validation and forest structure modeling in a pure and sparse forest of Picea glehnii in northern Hokkaido
Tomoko K. Akitsu; Tatsuro Nakaji; Toshiya Yoshida; Rei Sakai; Wataru Mamiya; Terigele; Kentaro Takagi; Yoshiaki Honda; Koji Kajiwara; Kenlo N. Nasahara, Lead
Ecological Research, 25 May 2020, [Reviewed] - Importance of the Collection of Abundant Ground‐Truth Data for Accurate Detection of Spatial and Temporal Variability of Vegetation by Satellite Remote Sensing
Shin Nagai; Kenlo Nishida Nasahara; Tomoko Kawaguchi Akitsu; Taku M. Saitoh; Hiroyuki Muraoka, Wiley
Biogeochemical Cycles, 10 Feb. 2020 - Evaluating land surface phenology from the Advanced Himawari Imager using observations from MODIS and the Phenological Eyes Network
Yan D; Zhang X; Nagai S; Yu Y; Akitsu T; Nasahara K.N; Ide R; Maeda T
International Journal of Applied Earth Observations and Geoinformation, Jul. 2019, [Reviewed] - Validating GCOM-C Terrestrial Ecology Products: How Should In-Situ Observation Be Performed at Satellite Scale?
Tomoko Akitsu; Koji Kajiwara; Kaoru Tachiiri; Hideki Kobayashi; Kazuho Matsumoto; Toshiyuki Kobayashi; Kenlo Nishida Nasahara; Tatsuro Nakaji; Hajime Kobayashi; Tetsuo Okano; Nobuko Saigusa; Masato Hayashi; Reiko Ide; Yoshiaki Honda, Lead
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, Jul. 2019, [Reviewed] - Correction to: Why is chlorophyll b only used in light-harvesting systems? (Journal of Plant Research, (2018), 131, 6, (961-972), 10.1007/s10265-018-1052-7)
Atsushi Kume; Tomoko Akitsu; Kenlo Nishida Nasahara, Springer Tokyo
Journal of Plant Research, 07 May 2019 - Why is chlorophyll b only used in light-harvesting systems?
Atsushi Kume; Tomoko Kawaguchi Akitsu; Nasahara Kenlo Nishida
Journal of Plant Research, Nov. 2018, [Reviewed] - 8 million phenological and sky images from 29 ecosystems from the Arctic to the tropics: the Phenological Eyes Network
Shin Nagai; Tomoko Akitsu; Taku M. Saitoh; Robert C. Busey; Karibu Fukuzawa; Yoshiaki Honda; Tomoaki Ichie; Reiko Ide; Hiroki Ikawa; Akira Iwasaki; Koki Iwao; Koji Kajiwara; Sinkyu Kang; Yongwon Kim; Kho Lip Khoon; Alexander V. Kononov; Yoshiko Kosugi; Takahisa Maeda; Wataru Mamiya; Masayuki Matsuoka; Trofim C. Maximov; Annette Menzel; Tomoaki Miura; Toshie Mizunuma; Tomoki Morozumi; Takeshi Motohka; Hiroyuki Muraoka; Hirohiko Nagano; Taro Nakai; Tatsuro Nakaji; Hiroyuki Oguma; Takeshi Ohta; Keisuke Ono; Runi Anak Sylvester Pungga; Roman E. Petrov; Rei Sakai; Christian Schunk; Seikoh Sekikawa; Ruslan Shakhmatov; Yowhan Son; Atsuko Sugimoto; Rikie Suzuki; Kentaro Takagi; Satoru Takanashi; Shunsuke Tei; Satoshi Tsuchida; Hirokazu Yamamoto; Eri Yamasaki; Megumi Yamashita; Tae Kyung Yoon; Toshiya Yoshida; Mitsunori Yoshimura; Shinpei Yoshitake; Matthew Wilkinson; Lisa Wingate; Kenlo Nishida Nasahara, Springer Tokyo
Ecological Research, 26 Jun. 2018, [Reviewed] - Reference dataset production manual for the accuracy assessment of global land cover products using information from the Degree Confluence Project
Soyama Noriko; Akitsu Tomoko; Tanggud Temulun, To assess the accuracy of global land cover products, a high quality reference dataset was globally compiled by a ground survey. However, on a global scale, the on-site collection of such data is very difficult to achieve. In this study, a reference dataset was produced using land cover information from the Degree Confluence Project (DCP), which is a volunteer-based project that aims to collect land cover information at the intersection of the world's integer latitude and longitude degree lines. This article aims to serve as a descriotion manual for the production of a reference dataset using DCP information to assess the accuracy of global land cover products., 天理大学人間学部総合教育研究センター
天理大学総合教育研究センター紀要, Jun. 2017 - Quantum sensors for accurate and stable long-term photosynthetically active radiation observations
Tomoko Akitsu; Kenlo Nishida Nasahara; Yasuo Hirose; Osamu Ijima; Atsushi Kume, Lead
AGRICULTURAL AND FOREST METEOROLOGY, May 2017, [Reviewed] - Leaf color is fine-tuned on the solar spectra to avoid strand direct solar radiation
Atsushi Kume; Tomoko Akitsu; Kenlo Nishida Nasahara
JOURNAL OF PLANT RESEARCH, Jul. 2016, [Reviewed] - On the stability of radiometric ratios of photosynthetically active radiation to global solar radiation in Tsukuba, Japan
Tomoko Akitsu; Atsushi Kume; Yasuo Hirose; Osamu Ijima; Kenlo Nishida Nasahara, Lead
AGRICULTURAL AND FOREST METEOROLOGY, Sep. 2015, [Reviewed] - JAXA SUPER SITES 500: LARGE-SCALE ECOLOGICAL MONITORING SITES FOR SATELLITE VALIDATION IN JAPAN
Tomoko Akitsu; Kenlo Nishida Nasahara; Hideki Kobayashi; Nobuko Saigusa; Masato Hayashi; Tatsuro Nakaji; Hajime Kobayashi; Tetsuo Okano; Yoshiaki Honda, Lead
2015 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS), 2015, [Reviewed] - Comparative Analysis of the Consistency of Measurements for a Rice Paddy Obtained by Different Optical Satellite Sensors
石原光則; 井上吉雄; 小野圭介; 秋津朋子; 奈佐原顕郎
日本リモートセンシング学会誌, Aug. 2014, [Reviewed] - Changes of Vegetation Indices due to Spectral Specifications of Satellite Sensors in a Grassland
村上和隆; 奈佐原顕郎; 秋津朋子; 本岡毅; 永井信
Bulletin of the Terrestrial Environment Research Center the University of Tsukuba, Dec. 2011, [Reviewed] - Long-term Observation of Seasonal and Yearly Variation of Grassland by an Automatic Digital Camera
秋津朋子; 奈佐原顕郎; 野田響; 本岡毅; 村上和隆; 土田聡; 永井信, Lead
Bulletin of the Terrestrial Environment Research Center the University of Tsukuba, Dec. 2011, [Reviewed] - CHLOROPLAST MICROTUBULES IN OEDOGONIUM-CAPILLIFORME (CHLOROPHYTA)
K UEDA; T KAWAGUCHI; T NOGUCHI
JOURNAL OF PHYCOLOGY, Feb. 1994, [Reviewed]
MISC
- Phenological Eyes Network (PEN): Long-Term Spectral Monitoring of Vegetation Indices at Five Flux Tower Sites in Japan
朱大均; 加藤知道; 中島直久; 奈佐原(西田)顕郎; 秋津朋子
生物と気象, 2025 - Analysis of the Phenology with NDVI and PRI derived from GCOM-C/SGLI data
笹川大河; 秋津朋子; 奈佐原顕郎
日本リモートセンシング学会学術講演会論文集(CD-ROM), 2021 - 太陽光誘起クロロフィル蛍光による生態系光合成量推定
加藤知道; 小林秀樹; 酒井佑槙; 野田響; 奈佐原顕郎; 秋津朋子; 小野圭介; 村岡裕由
日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology, 2019 - Ground truth observation with high accuracy for satellite ecological products at super sites
秋津朋子; 奈佐原顕郎; TERIGELE; 中路達郎; 吉田俊也; 坂井励; 間宮渉; 小林元; 岡野哲郎; 三枝信子; 井手玲子; 本多嘉明; 梶原康司; 堀雅裕; 小林秀樹
日本リモートセンシング学会学術講演会論文集(CD-ROM), 2018 - 太陽光誘発クロロフィル蛍光から見る個葉での光合成量
酒井佑槙; 加藤知道; 辻本克斗; 小林秀樹; 奈佐原顕郎; 秋津朋子; 村山昌平; 野田響; 村岡裕由
日本生態学会大会講演要旨(Web), 2018 - Toward development of terrestrial vegetation monitoring data set using Himawari-8 data
林航大; 市井和仁; 村上和隆; 吉岡博貴; 奈佐原顕郎; 秋津朋子; 井手玲子
日本リモートセンシング学会学術講演会論文集(CD-ROM), 2018 - Accuracy evaluation of satellite-derived snow cover at a highly dense vegetation region - A test experiment at the Tokachi-Mitsumata forest site -
堀雅裕; 小林利行; 栗原幸雄; 谷川朋範; 礒道みなと; 秋津朋子; 奈佐原顕郎; 杉浦幸之助; 青木輝夫; 青木輝夫
雪氷研究大会講演要旨集(Web), 2017 - Measurement and modeling of directional vertical SIF emission from multiple canopy layers in a cool temperate deciduous forest
加藤知道; 酒井佑槙; 辻本克斗; 小林秀樹; 奈佐原顕郎; 秋津朋子; 村岡裕由
日本リモートセンシング学会学術講演会論文集(CD-ROM), 2017 - SIFの地上観測-農地・森林での例
加藤知道; 辻本克斗; 奈佐原顕郎; 秋津朋子; 浅沼順; 小野圭介; 宮田明; 間野正美; 永井信; 村岡裕由; 斎藤琢; 三枝信子; 村山昌平
日本リモートセンシング学会学術講演会論文集(CD-ROM), 2016 - 生態系リモセンのためのJAXAスーパーサイト500
秋津朋子; 奈佐原顕郎; 小林秀樹; 楊偉; 本多嘉明; 梶原康司; 谷川聡; 三枝信子; 林真智; HABURA Pingchun; 高橋善幸; 廣瀬保雄; 井手玲子; 渡會貴之; 柴田英昭; 日浦勉; 吉田俊也; 高木健太郎; 中路達郎; 福澤加里部; 加藤知道; 高木方隆; 小野祐作; 栗原幸雄; 宮崎理紗
日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology, 2015 - フラックスタワーにおける高精度分光観測のための遮蔽装置の開発
井手玲子; 廣瀬保雄; 小熊宏之; 三枝信子; 秋津朋子; 奈佐原顕郎
日本農業気象学会全国大会講演要旨/Proceedings of International Symposium on Agricultural Meteorology, 2015 - 地上タワー観測によるクロロフィル蛍光を利用したスギ・ヒノキ植林の光合成機能の季節変化
辻本克斗; 加藤知道; 平野高司; 斎藤琢; 永井信; 秋津朋子; 奈佐原顕郎
日本地球惑星科学連合大会予稿集(Web), 2015 - 生態系タワー観測による太陽光誘発クロロフィル蛍光データベースの構築
加藤知道; 辻本克斗; 奈佐原顕郎; 秋津朋子; 永井信; 小野圭介; 斎藤琢; 村岡裕由; 野田響; 三枝信子; 井手玲子; 高橋善幸
日本地球惑星科学連合大会予稿集(Web), 2015 - GCOM-C観測プロダクトの検証に向けた地上観測機材の校正・性能評価の取り組み
堀雅裕; 村上浩; 今岡啓治; 小野祐作; 谷川朋範; 原田昌朋; 佐久間史洋; 片山晴善; 中島康裕; 中島幸徳; 本多嘉明; 梶原康司; 青木輝夫; 朽木勝幸; 山崎明宏; 奈佐原顕郎; 秋津朋子; 鈴木力英; 村松加奈子
日本気象学会大会講演予稿集, 2014
Lectures, oral presentations, etc.
- Two Decades of Time-Lapse Photos Reveal Long-Term Changes in Vegetation Phenology in Cool-Temperate Deciduous Forests of Japan
Sasagawa T.; Ichii K.; Noda H.; Akitsu T.; Kobayashi T.; Saitoh T.; Muraoka H.; Nasahara K.
AGU Fall Meeting 2025
20251215, 20251219 - The SIF-GPP relationship inconsistency in a Subtropical Evergreen Forest in Okinawa, Japan
Fu J.; Kato T.; Morozumi T.; Matsumoto K.; Taniguchi S.; Ueyama M.; Buareal K.; Miyauchi T.; Nakashima N.; Akitsu T.K.
AsiaFlux Conference 2025
20251020, 20251025 - he Phenological Eyes Network (PEN): A Long-Term In Situ Observation Network for Cross-Scale Phenology Monitoring
Sasagawa T.; Ichii K.; Noda H.; Akitsu T.; Kobayashi T.; Saitoh T.; Muraoka H.; Nasahara K.
AsiaFlux Conference 2025
20251020, 20251025 - Long-Term Vegetation Phenology Changes in Cool-Temperate Deciduous Forests of Japan Revealed by Two Decades of Time-Lapse Photography
Sasagawa T.; Muraoka H.; Noda H.M.; Akitsu T.K.; Kobayashi T.; Nasahara K.
JpGU 2025, 29 May 2025
20250525, 20250530 - Global-scale estimation of chlorophyll content derived from GCOM-C/SGLI: Effects of soil moisture and water bodies mixture in a pixel
Akitsu T.K.
JpGU 2025, 27 May 2025
20250525, 20250530 - Global products of carbon and water fluxes derived from BESS model with GCOM-C SGLI datasets
SHUAI S.; Hase M.; Ichii K.; Akitsu T.K.; Murakami H.
JpGU 2025, 27 May 2025
20250525, 20250530 - 静止気象衛星ひまわりを活用した日内光合成量の広域推定
山本雄平; 市井和仁; 高尾勇太; 植山雅仁; 秋津朋子; 岩田拓記; 北村兼三; 小南裕志; 鈴木純; 高木健太郎; 高梨聡; 高橋善幸; 平野高司; 松本一穂; 村山昌平; 安田幸生; 樋口篤志; 竹中栄晶
日本農業気象学会全国大会 2025
20250313, 20250315 - Across-crown and canopy variations of plant functional traits and spectra for deciduous broadleaf and evergreen coniferous species in a temperate forest
Lai R.; Nakaji T.; Akitsu T.K.; Hyodo F.; Noda H.; Kobayashi H.
EGU24, Apr. 2024
20240414, 20240419 - The GCOM-C/SGLI vegetation indices (NDVI, PRI, Chlorophyll Index) from the viewpoint of leaf optical property
Akitsu T.K.; Murakami H.; Kume A.; Kobayashi H.; Lai R.
EGU24
20240414, 20240419 - 様々な針葉樹葉の分光放射特性の違いが温暖化応答に及ぼす可能性
久米篤; 秋津朋子; 半場祐子; 奈佐原顕郎; 小口理一
日本生態学会第71回全国大会, Mar. 2024 - On the semi-analytical relationship between canopy photosynthesis and far-red sun-induced chlorophyll fluorescence (SIF) observation
Sakai Y.; Kobayashi H.; Kato T.; Nakashima N.; Morozumi T.; Hikosaka K.; Noda H.; Muraoka H.; Murayama S.; Nasahara K.N.; Akitsu T.K.; Outsuka T.; Yoshitake S.; Oshio H.; Yoshida Y.
71st Annual Meeting of Ecological Society of Japan, Mar. 2024 - Improving spatial matching of satellite images with field observations for vegetation phenology detection using PlanetScope data
Mengyu L.; Yang W.; Akitsu T.; Nasahara K.N.; Ide R.
AGU Annual Meeting 2023
20231212 - Estimating Physical and Physiological Plant Phenology with Himawari-8 and 9: Utilizing Hyper-temporal Data from Geostationary Satellites
Sasagawa T.; Ichii K.; Li W.; Akitsu T.; Nasahara K.N.
AGU Annual Meeting 2023, 12 Dec. 2023 - Development of “blended GRVI” for accurate vegetation phenology estimation with Himawari/AHI
Sasagawa T.; Li W.; Akitsu T.; Ichii K.; Nasahara K.N.
AsiaFlux 2023, 2023
20231127, 20231201 - 落葉広葉樹群落における波長別光透過率の季節変化
久米篤; 野田響; 奈佐原顕郎; 村岡裕由; 秋津朋子
日本植物学会第87回大会
20230904, 20230909 - How Useful Are the GCOM-C/SGLI Ecological Indices (PRI, NDVI, and LAI)?
Akitsu T.K.
34th International Symposium on Space Technology and Science, Jun. 2023
20230603, 20230609 - Vegetation recovery in canopy and understory after large-scale forest fires in Siberia detected from GCOM-C/SGLI
Akitsu T.K.; Moriyama M.
JpGU 2023
20230521, 20230526 - Earth Environment Variation Observed by GCOM-C “SHIKISAI” Five-year Operation
Murakami H.; Shimada R.; Tanada K.; Akitsu T.K.; Nakayama T.; Kurihara Y.
JpGU 2023, [Invited]
20230521, 20230526 - To what extent did understory vegetation contribute to the sun-induced chlorophyll fluorescence observed above the forest?
Morozumi T.; Kato T.; Kobayashi H.; Sakai Y.; Nakashima N.; Buareal K.; Nasahara K.N.; Akitsu T.K.; Murayama S.; Noda H.M.; Muraoka H.
INTECOL 2022, 2022
20220828, 20220902 - Evaluation of GOSAT-2 SIF with ground-based SIF in three common vegetation types.
Morozumi T.; Noda H.M.; Kato T.; Kobayashi H.; Sakai Y.; Nakashima N.; Buareal K.; Ono K.; Nasahara K.N.; Akitsu T.K.; Murayama S.; Muraoka H.
IWGGMS-18, Jul. 2022
20220712, 20220714 - The challenge to detect plant phenology using two green bands of GCOM-C/SGLI
Akitsu T.; Nasahara K.N.
JpGU 2022, May 2022 - A new feature-based algorithm for detecting the rice phenology at large scale
Xin Zhao; Kazuya Nishina; Yuji Masutomi; Tomoko K Akitsu; Kenlo N Nasahara
JpGU 2022, May 2022 - Estimation of leaf-level SIF from observed SIF for the reliable GPP calculation by remote sensing data in a cool temperate-deciduous broadleaf forest
Yuma Sakai; Hideki Kobayashi; Tomomichi Kato; Tomoki Morozumi; Naohisa Nakashima; Kenlo Nishida Nasahara; Tomoko Akitsu; Shohei Murayama; Hibiki M Noda; Hiroyuki Muraoka; Toshiyuki Ohtsuka; Shinpei Yoshitake; Kouki Hikosaka; Haruki Oshio; Yukio Yoshida
JpGU 2022, May 2022 - 花の「色」の機能は視覚的な情報伝達に限らない
久米篤; 北嶋諒太郎; 松田修; 佐竹崚; 奈佐原顕郎; 秋津朋子
第69回日本生態学会大会
20220314, 20220319 - Total and top-to-bottom emissions of solar-induced chlorophyll fluorescence in the canopy of a cool temperate deciduous broad-leaved forest in Takayama, Japan
Morozumi T.; Kato T.; Buareal K.; Nakashima N.; Sakai Y.; Kobayashi H.; Nasahara K.N.; Akitsu T.; Murayama S.; Noda H.; Muraoka H.
AsiaFlux Online Conference, 20 Dec. 2021 - Seasonal variation in Solar Induced chlorophyll Fluorescence from canopy top, middle, bottom layers, and sum of those signals as a potential proxy of gross primary productivity in a canopy of cool-temperate deciduous broadleaf forest in Takayama, Gifu
Morozumi T.; Kato T.; Buareal K.; Nakashima N.; Sakai Y.; Kobayashi H.; Nasahara K.N.; Akitsu T.; Murayama S.; Noda H.; Muraoka H.
AGU Fall Meeting 2021, Dec. 2021 - Retrieving solar-induced chlorophyll fluorescence from multilayers in a deciduous forest with low resolution field-measured spectra over the past decade
Nakashima N.; Kato T.; Morozumi T.; Tsujimoto K.; Akitsu T.K.; Nasahara K.N.; Murayama S.; Muraoka H.; Noda H.M.
AGU Fall Meeting 2021, Dec. 2021 - 分岐年代が異なるシダ植物の葉内構造と光合成・分光特性
半場祐子; 秋津朋子; 奈佐原顕郎; 田圭佑; 筒井悠里; 松本真由; 久米篤
日本植物学会第85回大会
20210916, 20210920 - GCOM-C/SGLIから得られるNDVI及びPRIによるフェノロジーの解析
笹川大河; 秋津朋子; 奈佐原顕郎
日本リモートセンシング学会第70回学術講演会
20210517, 20210518 - 複数の森林型における森林3次元観測システム｢OWL｣の精度検証および今後の展望
笹川大河; 清柳優里; 秋津朋子; 中路達郎; 奈佐原顕郎
第132回日本森林学会大会, Mar. 2021 - FLiES-SIF; 3D radiative transfer model to estimate the observed Sun-induced chlorophyll fluorescence from top of canopy
Yuma SAKAI; Hideki KOBAYASHI; Tomomichi KATO; Tomoki MOROZUMI; Naohisa NAKASHIMA; Katsuto TSHUJIMOTO; Kenlo NASAHARA; Tomoko AKITSU; Shohei MURAYAMA; Hibiki NODA; Hiroyuki MURAOKA; Toshiyuki OHTSUKA; Shinpei YOSHITAKE; Kouki HIKOSAKA
The 68th Annual Meeting of the Ecological Society of Japan, Mar. 2021 - Accuracy assessment of phenological reflectance index derived from GCOM-C/SGLI with in-situ data
Sasagawa T; Akitsu T. K; Nasahara K. N
International Symposium on Agricultural Meteorology (ISAM2021), Mar. 2021 - Detection of solar-induced fluorescence from lower resolution field-measured spectra over the past decade in deciduous broad-leaf forest in Japan
Nakashima N; Morozumi T; Kato T; Tsujimoto K; Akitsu T; Nasahara K. N; Muraoka H
JpGU-AGU Joint Meeting 2020, Dec. 2020
20201201, 20201217 - Challenging the detection of solar-induced fluorescence from lower resolution field-measured spectrum in Japan
Naohisa Nakashima; Tomoki Morozumi; Kanokrat Buareal; Tomomich Kato; Katsuto Tsujimoto; Tomoko Akitsu; Kenlo Nasahara; Keisuke Ono; Hiroyuki Muraoka
JpGU-AGU Joint Meeting 2020, Jul. 2020
20200712, 20200716 - Update of GCOM-C/SGLI Leaf Area Index & fraction of Absorbed Photosynthetically Active Radiation products
Kobayashi T; Kobayashi H; Wei Y; Honda Y; Ono Y; Nagai S; Akitsu T; Nasahara K; Hori M; Murakami H
JpGU-AGU Joint Meeting 2020, Jul. 2020 - 陸上の日射環境の指標となる波長
久米篤; 秋津朋子; 奈佐原顕郎
日本生態学会第67回全国大会, Mar. 2020 - 本州中部冷温帯林における太陽光誘起クロロフィル蛍光観測の手法検討および日中・季節変動
両角友喜; 加藤知道; 辻本克斗; ビュワイール・カノクラット; 小林秀樹; 酒井佑槙; 奈佐原顕郎; 秋津朋子; 村山昌平; 野田響; 村岡裕由
日本農業気象学会2019年北海道支部大会, Dec. 2019 - 入射日射スペクトルの変化から植物が得られる情報
久米篤; 秋津朋子; 奈佐原顕郎
日本植物学会第83回大会, Sep. 2019 - Validating GCOM-C terrestrial ecology products: How should in-situ observation be performed at satellite scale?
Akitsu T; Nasahara K; Nakaji T; Kobayashi Hajime; Okano T; Saigusa N; Hayashi M; Ide R; Honda Y; Kajiwara K; Tachiiri K; Kobayashi Hideki; Matsumoto K; Kobayashi T
2019 IEEE International Geoscience and Remote Sensing Symposium, 01 Aug. 2019
20190729, 20190802 - ひまわり8号による広域植生モニタリングの実現性評価
林 航大; 市井 和仁; 吉岡 博貴; 村上 和隆; 井手 玲子; 奈佐原 顕郎; 秋津朋子; 三浦 知昭
日本地球惑星科学連合2019年大会, May 2019 - Introduction of GCOM-C/SGLI Leaf Area Index & Fraction of Absorbed Photosynthetically Active Radiation products
Kobayashi T; HondaY; Ono Y; Kobayashi H; Wei Y; Nagai S; Akitsu T; Nasahara K; Miyazaki R; Hori M; Murakami H
JpGU Meeting 2019, May 2019 - 葉の構造の進化が分光吸収特性に及ぼしている影響
久米篤; 秋津朋子; 奈佐原顕郎
日本生態学会第66回全国大会, Mar. 2019 - Bottom-up and top-down approach investigations on solar induced fluorescence for estimating the photosynthesis at ecosystem scale by both ground-based measurement and modeling
Kato T; Kobayashi H; Sakai Y; Noda H; Miyauchi T; Nasahara K. N; Akitsu T; Murayama S; Muraoka H
AGU Fall Meeting 2018, Dec. 2018
20181210, 20181214 - ひまわり8号データを用いた広域植生モニタリングデータセット構築に向けて
林航大; 市井和仁; 村上和隆; 吉岡博貴; 奈佐原顕郎; 秋津朋子; 井手玲子
日本リモートセンシング学会第65回 (平成30年度秋季) 学術講演会, Nov. 2018
20181127, 20181128 - スーパーサイトにおける精密地上検証
秋津朋子; 奈佐原顕郎; Terigele; 中路達郎; 吉田俊也; 坂井励; 間宮渉; 小林元; 岡野哲郎; 三枝信子; 井手玲子; 本多嘉明; 梶原康司; 堀雅裕; 小林秀樹
日本リモートセンシング学会第64回(平成30年度春季)学術講演会, 17 May 2018, [Invited] - The simulation model of energy partition in leaf scale to estimate GPP from SIF
日本地球惑星科学連合2018年大会, May 2018 - 陰葉では何故クロロフィルbの割合が増えるのか？
久米篤; 秋津朋子; 奈佐原顕郎
日本生態学会第65回全国大会, Mar. 2018 - JapanFluxサイトとの連携によるJAXAスーパーサイト500 −人工衛星GCOM-C陸域生態系プロダクトの地上検証−
秋津朋子; 奈佐原顕郎; 中路達郎; 吉田俊也; 三枝信子; 井手玲子; 小林元; 小林秀樹; 本多嘉明; 梶原康司; 堀雅裕
JapanFlux10周年記念集会, Feb. 2018 - 冷温帯落葉広葉樹林における太陽光誘起クロロフィル蛍光の鉛直方向別観測とモデル化
加藤知道; 酒井佑槙; 辻本克斗; 小林秀樹; 奈佐原顕郎; 秋津朋子; 村岡裕由
日本リモートセンシング学会第63回（平成29年度秋季）学術講演会, Nov. 2017 - The estimation of GPP from SIF calculated from remote sensing data using theoretical model
Sakai Y; Kato T; Tsujimoto K; Kobayashi H; Nasahara K. N; Akitsu T; Murayama S; Noda H; Muraoka H
Potsdam Greenhouse Gas Workshop, 24 Oct. 2017 - Ground network of SIF based on eddy flux and spectral measurement tower in Japan
Kato T; Sakai Y; Tsujimoto K; Nasahara K. N; Akitsu T; Kobayashi H; Nagai S; Ono K; Saitoh T; Muraoka H; Noda H; Murayama S
Potsdam Greenhouse Gas Workshop, 24 Oct. 2017 - 太陽光誘発クロロフィル蛍光による生態系光合成量の推定
酒井佑慎; 加藤知道; 辻本克斗; 小林秀樹; 奈佐原顕郎; 秋津朋子; 村山昌平; 野田響; 村岡裕由
日本数理生物学会年会, Oct. 2017 - 高密度森林域における衛星積雪分布の精度評価手法の検討 －十勝三股樹海における試験観測－
堀雅裕; 小林利行; 栗原幸雄; 谷川朋範; 礒道みなと; 秋津朋子; 奈佐原顕郎; 杉浦幸之助; 青木輝夫
雪氷研究大会, Sep. 2017 - Directional partitioning of vertical Solar-Induced Fluorescence emissions for estimating ecosystem photosynthesis in a deciduous broad-leaf forest in Japan
Kato T; Sakai Y; Tsujimoto K; Nasahara K. N; Akitsu T; Murayama S; Noda H; Muraoka H
AsiaFlux WS, 17 Aug. 2017 - Analysis of the relationship between the GPP and SIF from remote sensing data using theoretical model
Sakai Y; Kato T; Tsujimoto K; Kobayashi H; Nasahara K. N; Akitsu T; Murayama S; Noda H. M; Muraoka H
JpGU-AGU Joint Meeting 2017, 25 May 2017 - Multi-layer measurement of upward and downward solar-induced chlorophyll fluorescence in a cool-temperate deciduous broadleaf forest
Kato T; Tsujimoto K; Sakai Y; Kobayashi H; Nasahara K. N; Akitsu T; Murayama S; Noda H. M; Muraoka H
JpGU-AGU Joint Meeting 2017, 25 May 2017 - Do you still use the constant ratio of PAR to solar radiation for global studies?
Akitsu T; Nashara K. N; Kume A; Hirose Y; Ijima O; Takagi K; Ide R
JpGU-AGU Joint Meeting 2017, 25 May 2017 - JAXA super sites 500: a large footprint ecological monitoring project for satellite validation
Akitsu T; Nashara K. N; Nakaji T; Yoshida T; Saigusa N; Kobayashi H; Hayashi M; Hori M; Honda Y
JpGU-AGU Joint Meeting 2017, 20 May 2017 - 森林生態リモートセンシング研究のための大規模森林調査プロットの整備
中路達郎; 秋津朋子; 吉田俊也; 日浦勉; 中村誠宏; 柴田英昭; 奈佐原顕郎
第128回日本森林学会, Mar. 2017 - Ground-based network of Long-term measurement of Sun-Induced Chlorophyll Fluorescence
Kato T; K. Tsujimoto; K. Nasahara; T. Akitsu; S. Nagai; K. Ono; T.M.Saitoh; H. Muraoka; H. Noda; N. Saigusa; R. Ide; Y. Takahashi
12th International Workshop on Greenhouse Gas Measurements from Space, 08 Jun. 2016 - 真瀬水田における太陽光誘発クロロフィル蛍光を利用した生態系光合成量の代表性
加藤知道; 辻本克斗; 奈佐原-西田顕郎; 秋津朋子; 小野圭介; 宮田明
日本地球惑星科学連合2016年大会, May 2016 - 冷温帯林における光合成機能の鉛直分布とその季節変化
辻本克斗; 川島在悟; 加藤知道; 斎藤琢; 村岡裕由; 秋津朋子; 奈佐原顕郎
日本地球惑星科学連合2016年大会, Apr. 2016 - 野外における分光測定の生態学的な意義
久米 篤; 秋津 朋子; 奈佐原 顕郎
日本生態学会第63回全国大会, Mar. 2016 - クロロフィル蛍光パラメータによる冷温帯林の光合成機能の解明
辻本克斗; 川島在悟; 加藤知道; 斎藤琢; 村岡裕由; 秋津朋子; 奈佐原顕郎
第63回日本生態学会全国大会, Mar. 2016 - 空の色を測る
久米 篤; 秋津 朋子; 奈佐原 顕郎
第47回種生物学シンポジウム, Dec. 2015 - Sun-induced chlorophyll fluorescence reveals strong representation of photosynthesis at ecosystem level in rice paddy field in Japan
Kato T; Tsujimoto K; NasaharaK.N; Akitsu T; Ono K; Miyata A
AGU Fall Meeting 2015, Dec. 2015 - Estimation of gross primary production and light use efficiency by the tower-based sun-induced fluorescence measurement in the Japanese evergreen coniferous forest
Kato T; Tsujimoto K; Hirano T; Saitoh T; Nagai S; Akitsu T; Nasahara, K.N
AGU Fall Meeting 2015, Dec. 2015 - Development of large-scale ecological monitoring sites for satellite validation in natural forests in Hokkaido, Japan
Nakaji T; Akitsu T; Kobayashi H; Hayashi M; Saigusa N; Kajiwara K; Honda Y; Nasahara K; Nakamura M; Yoshida T; Shibata H; Hiura T
The 23rd CEReS International Symposium, Dec. 2015 - JAXA super sites 500: large-scale ecological monitoring sites for satellite validation in Japan
Akitsu T; Nasahara K; Kobayashi H; Saigusa N; Hayashi M; Nakaji T; Honda Y
2015 IEEE International Geoscience and Remote Sensing Symposium, Jul. 2015 - 地上タワー観測によるクロロフィル蛍光を利用したスギ・ヒノキ植林の光合成機能の季節変化
辻本克斗; 加藤知道; 平野高司; 斎藤琢; 永井信; 秋津朋子; 奈佐原顕郎
日本地球惑星科学連合2015年大会, May 2015 - 生態系タワー観測による太陽光誘発クロロフィル蛍光データベースの構築
加藤知道; 辻本克斗; 奈佐原顕郎; 秋津朋子; 永井信; 小野圭介; 斎藤琢; 村岡裕由; 野田響; 三枝信子; 井手玲子; 高橋善幸
日本地球惑星科学連合2015年大会, May 2015 - 地上タワー観測によるクロロフィル蛍光を利用したスギ・ヒノキ植林の光合成機能の季節変化
辻本克斗; 加藤知道; 平野高司; 斎藤琢; 永井信; 秋津朋子; 奈佐原顕郎
第126回 日本森林学会大会, Mar. 2015 - フラックスタワーにおける高精度分光観測のための遮蔽装置の開発
井手玲子; 廣瀬保雄; 小熊宏之; 三枝信子; 秋津朋子; 奈佐原顕郎
日本農業気象学会2015年全国大会, Mar. 2015 - 生態系リモセンのためのJAXAスーパーサイト500
秋津朋子; 奈佐原顕郎; 小林秀樹; 楊偉; 本多嘉明; 梶原康司; 谷川聡; 三枝信子; 林真智; Pingchun Habura; 高橋善幸; 廣瀬保雄; 井手玲子; 渡會貴之; 柴田英昭; 日浦勉; 吉田俊也; 高木健太郎; 中路達郎; 福澤加里部; 加藤知道; 高木方隆; 小野祐作; 栗原幸雄; 宮崎理紗
日本農業気象学会2015年全国大会, Mar. 2015 - 地上タワー観測によるクロロフィル蛍光を利用した常緑針葉樹林のCO₂吸収量の推定
辻本克斗; 加藤知道; 平野高司; 斎藤琢; 永井信; 秋津朋子; 奈佐原顕郎
日本農業気象学会北海道支部会, Dec. 2014 - GCOM-C 観測プロダクトの検証に向けた地上観測機材の校正・性能評価の取り組み
堀雅裕; 村上浩; 今岡啓治; 小野祐作; 谷川朋範; 原田昌朋; 佐久間史洋; 片山晴善; 中島康裕; 中島幸徳; 本多嘉明; 梶原康司; 青木輝夫; 朽木勝幸; 山崎明宏; 奈佐原顕郎; 秋津朋子; 鈴木力英; 村松加奈子
日本気象学会2014年秋季大会, Oct. 2014 - 光合成有効放射と放射観測
久米篤; 秋津朋子; 奈佐原顕郎; 廣瀬保雄; 居島修
日本気象学会2014年秋季大会, Oct. 2014 - 葉の光吸収は直達日射スペクトルと精密に対応している
久米篤; 秋津朋子; 奈佐原顕郎
日本植物学会第78回大会, Sep. 2014 - ハイパースペクトル日射観測の意義
久米篤; 秋津朋子; 奈佐原顕郎
日本地球惑星科学連合2014年大会, May 2014 - 異種衛星センサ画像を用いた水田観測手法の検討
石原光則; 小野圭介; 秋津朋子; 奈佐原顕郎; 井上吉雄
日本リモートセンシング学会第53回学術講演会, Nov. 2012 - 直達放射と散乱放射のスペクトルの違いの影響
久米篤; 秋津朋子; 奈佐原顕郎
第61回北方森林学会大会, Nov. 2012 - 陸上植物は最大直達日射を避けるために緑なのかもしれない
久米篤; 秋津朋子; 奈佐原顕郎
日本植物学会第76回大会, Sep. 2012 - Phenological Eyes Networkによる, 生態系リモートセンシングのための長期地上データセット
秋津朋子; 奈佐原顕郎
日本地球惑星科学連合2012年大会, May 2012 - 野外におけるPAR測定の意義と必要とされるセンサ
久米篤; 秋津朋子; 片山博之; 奈佐原顕郎
日本生態学会第59回全国大会, Mar. 2012 - 全天日射に対する光合成有効放射の比率はどのくらい一定か
秋津朋子; 久米篤; 廣瀬保雄; 奈佐原顕郎
日本生態学会第59回全国大会, Mar. 2012 - Leaf phenology in a tropical monsoonal evergreen forest at Sakaerat, Thailand, detected by fixed view camera images - influence of climate on the greening-up -
Maeda T; Panuthai S; Artchawakom T; Akitsu T; Ishida A
AsiaFlux WS, Sep. 2011 - 地上分光観測と陸域生態系モデルによるポイントスケールでの炭素収支解析
村上和隆; 佐々井崇博; 野田響; 秋津朋子; 奈佐原顕郎
日本生態学会第58回全国大会, Mar. 2011 - Leaf phenology in a tropical monsoonal evergreen forest at Sakaerat, Thailand, detected by fixed view camera images - analyses on the individual scale -
Maeda T; Akitsu T; Panuthai S; Artchawakom T; Ishida A
AsiaFlux WS, Dec. 2010
Courses
Research Themes
- 長期地上観測で捉える「陸域生態系の環境応答は人工衛星でどう見えるか」
学術変革領域研究(A)
国立研究開発法人宇宙航空研究開発機構
16 Jun. 2022 - 31 Mar. 2024 - 光合成有効放射 (PAR) の日射に占める割合は気候変動でどう変わるか？
Apr. 2019 - Mar. 2022 - 日射利用に対する陸上植物の機能的進化と環境適応の解明
Apr. 2018 - Mar. 2021
