Faculty Profiles - KOTANI, Ayumi

Papers - KOTANI, Ayumi

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Dynamic Mapping of Subarctic Surface Water by Fusion of Microwave and Optical Satellite Data Using Conditional Adversarial Networks

Mizuochi Hiroki, Iijima Yoshihiro, Nagano Hirohiko, Kotani Ayumi, Hiyama Tetsuya

REMOTE SENSING Vol. 13 ( 2 ) page： 1 - 19 2021.1

Author Correction: The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data (Scientific Data, (2020), 7, 1, (225), 10.1038/s41597-020-0534-3)

Pastorello G.

Scientific Data Vol. 8 ( 1 ) 2021

Seasonal variations in carbon dioxide exchange fluxes at a taiga–tundra boundary ecosystem in Northeastern Siberia

Shunsuke Tei, Tomoki Morozumi, Ayumi Kotani, Shinya Takano, Atsuko Sugimoto, Shin Miyazaki, Ryo Shingubara, Rong Fan, Roman Petrov, Egor Starostin, Ruslan Shakhmatov, Aleksandr Nogovitcyn, Trofim Maximov

Polar Science 2021

Lessons learned from more than a decade of greenhouse gas flux measurements at boreal forests in eastern Siberia and interior Alaska

Hiyama T.

Polar Science 2021

Detection of year-to-year spring and autumn bio-meteorological variations in siberian ecosystems

Nagai Shin, Kotani Ayumi, Morozumi Tomoki, Kononov Alexander V, Petrov Roman E, Shakhmatov Ruslan, Ohta Takeshi, Sugimoto Atsuko, Maximov Trofim C, Suzuki Rikie, Tei Shunsuke

POLAR SCIENCE Vol. 25 2020.9

Direct measurement of leaf area index in a deciduous needle-leaf forest, eastern Siberia

Shin Nagai, Kotani Ayumi, Sato Tomonori, Sugimoto Atsuko, Maximov Trofim C, Nogovitcyn Aleksandr, Miyamoto Yumiko, Kobayashi Hideki, Tei Shunsuke

POLAR SCIENCE Vol. 25 2020.9

The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data

Pastorello Gilberto, Trotta Carlo, Canfora Eleonora, Chu Housen, Christianson Danielle, Cheah You-Wei, Poindexter Cristina, Chen Jiquan, Elbashandy Abdelrahman, Humphrey Marty, Isaac Peter, Polidori Diego, Ribeca Alessio, van Ingen Catharine, Zhang Leiming, Amiro Brian, Ammann Christof, Arain M. Altaf, Ardo Jonas, Arkebauer Timothy, Arndt Stefan K., Arriga Nicola, Aubinet Marc, Aurela Mika, Baldocchi Dennis, Barr Alan, Beamesderfer Eric, Marchesini Luca Belelli, Bergeron Onil, Beringer Jason, Bernhofer Christian, Berveiller Daniel, Billesbach Dave, Black Thomas Andrew, Blanken Peter D., Bohrer Gil, Boike Julia, Bolstad Paul V., Bonal Damien, Bonnefond Jean-Marc, Bowling David R., Bracho Rosvel, Brodeur Jason, Bruemmer Christian, Buchmann Nina, Burban Benoit, Burns Sean P., Buysse Pauline, Cale Peter, Cavagna Mauro, Cellier Pierre, Chen Shiping, Chini Isaac, Christensen Torben R., Cleverly James, Collalti Alessio, Consalvo Claudia, Cook Bruce D., Cook David, Coursolle Carole, Cremonese Edoardo, Curtis Peter S., D'Andrea Ettore, da Rocha Humberto, Dai Xiaoqin, Davis Kenneth J., De Cinti Bruno, de Grandcourt Agnes, De Ligne Anne, De Oliveira Raimundo C., Delpierre Nicolas, Desai Ankur R., Di Bella Carlos Marcelo, di Tommasi Paul, Dolman Han, Domingo Francisco, Dong Gang, Dore Sabina, Duce Pierpaolo, Dufrene Eric, Dunn Allison, Dusek Jiri, Eamus Derek, Eichelmann Uwe, ElKhidir Hatim Abdalla M., Eugster Werner, Ewenz Cacilia M., Ewers Brent, Famulari Daniela, Fares Silvano, Feigenwinter Iris, Feitz Andrew, Fensholt Rasmus, Filippa Gianluca, Fischer Marc, Frank John, Galvagno Marta, Gharun Mana, Gianelle Damiano, Gielen Bert, Gioli Beniamino, Gitelson Anatoly, Goded Ignacio, Goeckede Mathias, Goldstein Allen H., Gough Christopher M., Goulden Michael L., Graf Alexander, Griebel Anne, Gruening Carsten, Gruenwald Thomas, Hammerle Albin, Han Shijie, Han Xingguo, Hansen Birger Ulf, Hanson Chad, Hatakka Juha, He Yongtao, Hehn Markus, Heinesch Bernard, Hinko-Najera Nina, Hoertnagl Lukas, Hutley Lindsay, Ibrom Andreas, Ikawa Hiroki, Jackowicz-Korczynski Marcin, Janous Dalibor, Jans Wilma, Jassal Rachhpal, Jiang Shicheng, Kato Tomomichi, Khomik Myroslava, Klatt Janina, Knohl Alexander, Knox Sara, Kobayashi Hideki, Koerber Georgia, Kolle Olaf, Kosugi Yoshiko, Kotani Ayumi, Kowalski Andrew, Kruijt Bart, Kurbatova Julia, Kutsch Werner L., Kwon Hyojung, Launiainen Samuli, Laurila Tuomas, Law Bev, Leuning Ray, Li Yingnian, Liddell Michael, Limousin Jean-Marc, Lion Marryanna, Liska Adam J., Lohila Annalea, Lopez-Ballesteros Ana, Lopez-Blanco Efren, Loubet Benjamin, Loustau Denis, Lucas-Moffat Antje, Lueers Johannes, Ma Siyan, Macfarlane Craig, Magliulo Vincenzo, Maier Regine, Mammarella Ivan, Manca Giovanni, Marcolla Barbara, Margolis Hank A., Marras Serena, Massman William, Mastepanov Mikhail, Matamala Roser, Matthes Jaclyn Hatala, Mazzenga Francesco, McCaughey Harry, McHugh Ian, McMillan Andrew M. S., Merbold Lutz, Meyer Wayne, Meyers Tilden, Miller Scott D., Minerbi Stefano, Moderow Uta, Monson Russell K., Montagnani Leonardo, Moore Caitlin E., Moors Eddy, Moreaux Virginie, Moureaux Christine, Munger J. William, Nakai Taro, Neirynck Johan, Nesic Zoran, Nicolini Giacomo, Noormets Asko, Northwood Matthew, Nosetto Marcelo, Nouvellon Yann, Novick Kimberly, Oechel Walter, Olesen Jorgen Eivind, Ourcival Jean-Marc, Papuga Shirley A., Parmentier Frans-Jan, Paul-Limoges Eugenie, Pavelka Marian, Peichl Matthias, Pendall Elise, Phillips Richard P., Pilegaard Kim, Pirk Norbert, Posse Gabriela, Powell Thomas, Prasse Heiko, Prober Suzanne M., Rambal Serge, Rannik Ullar, Raz-Yaseef Naama, Reed David, de Dios Victor Resco, Restrepo-Coupe Natalia, Reverter Borja R., Roland Marilyn, Sabbatini Simone, Sachs Torsten, Saleska Scott R., Sanchez-Canete Enrique P., Sanchez-Mejia Zulia M., Schmid Hans Peter, Schmidt Marius, Schneider Karl, Schrader Frederik, Schroder Ivan, Scott Russell L., Sedlak Pavel, Serrano-Ortiz Penelope, Shao Changliang, Shi Peili, Shironya Ivan, Siebicke Lukas, Sigut Ladislav, Silberstein Richard, Sirca Costantino, Spano Donatella, Steinbrecher Rainer, Stevens Robert M., Sturtevant Cove, Suyker Andy, Tagesson Torbern, Takanashi Satoru, Tang Yanhong, Tapper Nigel, Thom Jonathan, Tiedemann Frank, Tomassucci Michele, Tuovinen Juha-Pekka, Urbanski Shawn, Valentini Riccardo, van der Molen Michiel, van Gorsel Eva, van Huissteden Ko, Varlagin Andrej, Verfaillie Joseph, Vesala Timo, Vincke Caroline, Vitale Domenico, Vygodskaya Natalia, Walker Jeffrey P., Walter-Shea Elizabeth, Wang Huimin, Weber Robin, Westermann Sebastian, Wille Christian, Wofsy Steven, Wohlfahrt Georg, Wolf Sebastian, Woodgate William, Li Yuelin, Zampedri Roberto, Zhang Junhui, Zhou Guoyi, Zona Donatella, Agarwal Deb, Biraud Sebastien, Torn Margaret, Papale Dario

SCIENTIFIC DATA Vol. 7 ( 1 ) 2020.7

Assessment of drought condition using remotely sensed drought severity index and its correlations with soil moisture product in Inner Mongolia

Wang Lusha, Kotani Ayumi, Tanaka Takafumi, Ohta Takeshi

THEORETICAL AND APPLIED CLIMATOLOGY Vol. 141 ( 1-2 ) page： 715 - 728 2020.7

Application of an open-path eddy covariance methane flux measurement system to a larch forest in eastern Siberia

Nakai Taro, Hiyama Tetsuya, Petrov Roman E., Kotani Ayumi, Ohta Takeshi, Maximov Trofim C.

AGRICULTURAL AND FOREST METEOROLOGY Vol. 282-283 2020.3

Application of Improved Remotely Sensed Drought Severity Index Based on Soil Moisture Product in Inner Mongolia

Wang Lusha, Kotani Ayumi, Tanaka Takafumi, Ohta Takeshi

SOLA Vol. 16 ( 0 ) page： 259 - 264 2020

Publishing type：Research paper (scientific journal) Publisher：公益社団法人日本気象学会

<p>Based on the drought severity index (DSI), which is derived from the ratio of evapotranspiration (ET) to potential evapotranspiration (PET) and normalized difference vegetation index (NDVI), as measured by remote sensing, we replaced the ET/PET ratio with soil moisture (0-10 cm) to establish an improved index (IDSI) and evaluated the drought situation in Inner Mongolia. The two components in IDSI are independently derived; however, the effects of evapotranspiration are contained in the soil moisture, and even precipitation changes could be reflected. We used monthly IDSI data for Inner Mongolia to evaluate drought throughout the growing season (May–September) during 2001-2010. The IDSI showed that 2001, 2007, and 2009 were years with significant drought. Areas that experienced extreme drought were less extensive than those found by the DSI because we removed the ET/PET component, which already contains the effects of the NDVI. IDSI results not only contained the degree of precipitation change for a given month through soil moisture, but also reflected the influence of water and heat in the previous month through the NDVI. Moreover, IDSI results were generally consistent with agricultural drought disaster records.</p>

DOI： 10.2151/sola.2020-043

Web of Science

Scopus

Effects of extreme drought and wet events for tree mortality: Insights from tree-ring width and carbon isotope ratio in a Siberian larch forest

Tei Shunsuke, Sugimoto Atsuko, Yonenobu Hitoshi, Kotani Ayumi, Maximov Trofim C.

ECOHYDROLOGY Vol. 12 ( 8 ) 2019.12

Strong and stable relationships between tree-ring parameters and forest-level carbon fluxes in a Siberian larch forest

Tei Shunsuke, Sugimoto Atsuko, Kotani Ayumi, Ohta Takeshi, Morozumi Tomoki, Saito Soma, Hashiguchi Shuhei, Maximov Trofim

POLAR SCIENCE Vol. 21 page： 146 - 157 2019.9

Impact of unusually wet permafrost soil on understory vegetation and CO2 exchange in a larch forest in eastern Siberia Reviewed

Kotani Ayumi, Saito Atsushi, Kononov Alexander V, Petrov Roman E, Maximov Trofim C, Iijima Yoshihiro, Ohta Takeshi

AGRICULTURAL AND FOREST METEOROLOGY Vol. 265 page： 295 - 309 2019.2

Energy-water budget analysis of an Arctic terrestrial models intercomparison GTMIP Reviewed

SAITO Kazuyuki, MORI Junko, MACHIYA Hirokazu, MIYAZAKI Shin, ISE Takeshi, SUEYOSHI Tetshuo, YAMAZAKI Takeshi, IIJIMA Yoshihiro, IKAWA Hiroki, ICHII Kazuhito, ITO Akihiko, OʼOISHI Ryouta, OOTA Takeshi, KATATA Genki, KOTANI Ayumi, SASAI Takahiro, SATO Atsushi, SATO Hisashi, SUGIMOTO Atsuko, SUZUKI Rikie, TANAKA Katsunori, NITTA Tomoko, NIWANO Masashi, BURKE Eleanor, PARK Hotaek, YAMAGUCHI Satoru

Journal of the Japanese Society of Snow and Ice Vol. 80 ( 2 ) page： 159 - 174 2018

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Snow and Ice

An Arctic terrestrial model intercomparison project (GTMIP), designed for enhanced collaborations between modeling and field scientists, and for assessment of uncertainty and variations in current terrestrial models to improve, was carried out with 21 domestic and international participants, ranging from physical to biogeochemical to hybrid models. Metrics of the project covers energy-water budget, snowpack, phenology, subsurface regimes, and carbon budget. This paper reports the results on energy-water budget between the atmosphere, surface and subsurface, of the 34-year site simulations (1980-2013) for four GRENE-TEA sites with different eco-climate background (i.e., Fairbanks, Kevo, Tiksi, and Yakutsk). Models were driven by common, statistically fitted data created through model‒field collaborations with use of the site observations.
Energetic and hydrological balances between the atmosphere showed no systematic differences that result from disciplines that models are oriented to, but individual modelsʼ specifics. Modelsʼ performance at different sites were less associated with the types or complexity of the models than with the ecological and subsurface characteristics of the sites. The model ensemble proved to be a robust estimate to represent the observed values in general. However, snowpack and subsurface hydrological-thermal states, which greatly affect surface-subsurface exchanges, demonstrated large differences in performance and biases among models, which implies needs for special attention at future developments.

DOI： 10.5331/seppyo.80.2_159

CiNii Research

Reconciliation of top-down and bottom-up CO2 fluxes in Siberian larch forest

Takata Kumiko, Patra Prabir K., Kotani Ayumi, Mori Junko, Belikov Dmitry, Ichii Kazuhito, Saeki Tazu, Ohta Takeshi, Saito Kazuyuki, Ueyama Masahito, Ito Akihiko, Maksyutov Shamil, Miyazaki Shin, Burke Eleanor J., Ganshin Alexander, Iijima Yoshihiro, Ise Takeshi, Machiya Hirokazu, Maximov Trofim C., Niwa Yosuke, O'ishi Ryo'ta, Park Hotaek, Sasai Takahiro, Sato Hisashi, Tei Shunsuke, Zhuravlev Ruslan, Machida Toshinobu, Sugimoto Atsuko, Aoki Shuji

ENVIRONMENTAL RESEARCH LETTERS Vol. 12 ( 12 ) 2017.12

New data-driven estimation of terrestrial CO2 fluxes in Asia using a standardized database of eddy covariance measurements, remote sensing data, and support vector regression

Ichii Kazuhito, Ueyama Masahito, Kondo Masayuki, Saigusa Nobuko, Kim Joon, Carmelita Alberto Ma., Ardoe Jonas, Euskirchen Eugenie S., Kang Minseok, Hirano Takashi, Joiner Joanna, Kobayashi Hideki, Marchesini Luca Belelli, Merbold Lutz, Miyata Akira, Saitoh Taku M., Takagi Kentaro, Varlagin Andrej, Bret-Harte M. Syndonia, Kitamura Kenzo, Kosugi Yoshiko, Kotani Ayumi, Kumar Kireet, Li Sheng-Gong, Machimura Takashi, Matsuura Yojiro, Mizoguchi Yasuko, Ohta Takeshi, Mukherjee Sandipan, Yanagi Yuji, Yasuda Yukio, Zhang Yiping, Zhao Fenghua

JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES Vol. 122 ( 4 ) page： 767 - 795 2017.4

Analysing the origin of rain- and subsurface water in seasonal wetlands of north-central Namibia

Hiyama Tetsuya, Kanamori Hironari, Kambatuku Jack R., Kotani Ayumi, Asai Kazuyoshi, Mizuochi Hiroki, Fujioka Yuichiro, Iijima Morio

ENVIRONMENTAL RESEARCH LETTERS Vol. 12 ( 3 ) 2017.3

Impact of rice cultivation on evapotranspiration in small seasonal wetlands of north-central Namibia

Kotani Ayumi, Hiyama Tetsuya, Ohta Takeshi, Hanamura Miho, R Kambatuku Jack, K Awala Simon, Iijima Morio

Hydrological Research Letters Vol. 11 ( 2 ) page： 134 - 140 2017

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Hydrology and Water Resources (JSHWR) / Japanese Association of Groundwater Hydrology (JAGH) / Japanese Association of Hydrological Sciences (JAHS) / Japanese Society of Physical Hydrology (JSPH)

<p>This paper aims to evaluate the effect of mixed-cropping of rice and upland crops on evapotranspiration (ET) in a small seasonal wetland in the north-central Namibia. Meteorological observations were conducted in the experimental sloped field, which simulated the cultivation of both rice in a wetland environment and upland crops in the surrounding rain-fed area, and included a reference wetland with natural vegetation. During cultivation, ET from the rice field was similar to that from the wetland. However, during the dry period ET was remarkably reduced in the post-harvest field, while continuous ET occurred in the natural wetland even after surface water had dried up. The response of surface conductance to meteorological variables was investigated by means of the Jarvis–Stewart conductance model. During cultivation, surface conductance of the rice field and the wetland had a distinct stress response compared with that of the rain–fed crop field. During the dry period, surface conductance of the wetland site, in which the surface water dried–up, still responded to the meteorological conditions in contrast to those of the post-harvest field with plowed bare soil.</p>

DOI： 10.3178/hrl.11.134

Web of Science

Scopus

CiNii Research

Factors contributing to soil nitrogen mineralization and nitrification rates of forest soils in the Japanese archipelago

Urakawa Rieko, Ohte Nobuhito, Shibata Hideaki, Isobe Kazuo, Tateno Ryunosuke, Oda Tomoki, Hishi Takuo, Fukushima Keitaro, Inagaki Yoshiyuki, Hirai Keizo, Oyanagi Nobuhiro, Nakata Makoto, Toda Hiroto, Kenta Tanaka, Kuroiwa Megumi, Watanabe Tsunehiro, Fukuzawa Karibu, Tokuchi Naoko, Ugawa Shin, Enoki Tsutomu, Nakanishi Asami, Saigusa Nobuko, Yamao Yukio, Kotani Ayumi

FOREST ECOLOGY AND MANAGEMENT Vol. 361 page： 382 - 396 2016.2

Persistence and memory timescales in root-zone soil moisture dynamics

Ghannam Khaled, Nakai Taro, Paschalis Athanasios, Oishi Christopher A., Kotani Ayumi, Igarashi Yasunori, Kumagai Tomo'omi, Katul Gabriel G.

WATER RESOURCES RESEARCH Vol. 52 ( 2 ) page： 1427 - 1445 2016.2

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Papers - KOTANI, Ayumi