Faculty Profiles - KOTANI, Ayumi

Papers - KOTANI, Ayumi

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Data mining by watching old documentary TV programs to learn about the relationships between people’s lives and the landscape in Sakha in the perestroika era at the end of the 1980s

Shin Nagai, Ayumi Kotani, Yasuyuki Maruya, Yuka Oishi

EarthArXiv 2022.8

Language：English Publishing type：Research paper (scientific journal) Publisher：California Digital Library (CDL)

To accurately evaluate the spatiotemporal variability of ecosystem functions and services, as well as biodiversity, under a rapidly changing climate and shifting anthropogenic activities, it is an important but challenging task to retrieve information about past relationships among society, people’s lives, and the landscape. We watched documentary TV programs broadcast by the Japanese public broadcasting station (NHK) about 30 years ago to examine these past relationships in the Republic of Sakha (formerly the Yakut Autonomous Soviet Socialist Republic) in eastern Siberia at the end of the 1980s (the “perestroika era”). We viewed 3 episodes of the documentary “NHK Special: The Arctic Circle” and summarized the content of the episodes. The importance of discovering mammoth tusks in this Arctic region to acquire foreign currency was highlighted, as was the relationship between nomadic peoples in Chukchi and managers of their sovkhoz. A trip down the Lena River featured the relationships of economic activities and ethnic minorities in the perestroika era, highlighting the importance of natural resources and the local environment. Despite limitations caused by production choices and historical background and unconscious bias of people at that time, and copyright and privacy issues, we concluded that old TV programs can be useful resources to retrieve information about people’s lives and landscapes in the past.

DOI： 10.31223/x5kw79

Monitoring of cherry flowering phenology with Google Trends Reviewed Open Access

Shin Nagai, Kotani Ayumi, Tei Shunsuke, Tsutsumida Narumasa

PLOS ONE Vol. 17 ( 7 ) 2022.7

Language：English Publishing type：Research paper (scientific journal) Publisher：PLoS ONE

Google Trends (GT) is an online tool designed for searching for changes over time. We assessed its use for evaluating changes in the timing of cherry flowering phenology, which is of intense interest to Japanese people. We examined the relationship between time-series of relative search volume (RSV: relative change in search requests over time obtained from the GT access engine) and cherry flowering information published on websites (as ground truth) in relation to three famous ancient cherry trees. The time-series of RSV showed an annual bell-shaped seasonal variability, and the dates of the maximum RSV tended to correspond to the dates of full bloom. Our results suggest that GT allows monitoring of multiple famous cherry flowering sites where we cannot obtain long-term flowering data to evaluate the spatiotemporal variability of cherry flowering phenology.

DOI： 10.1371/journal.pone.0271648

Open Access

Web of Science

Scopus

The relationships between basin conditions and long-term runoff characteristics in Japanese basins with little snow by comparing tank model parameters Open Access

HOTTA Yuki, TANAKA Takafumi, KOTANI Ayumi

Journal of Japanese Association of Hydrological Sciences Vol. 52 ( 1 ) page： 1 - 22 2022.4

Contrasting 20-year trends in NDVI at two Siberian larch forests with and without multiyear waterlogging-induced disturbances Reviewed Open Access

Hirohiko Nagano, Ayumi Kotani, Hiroki Mizuochi, Kazuhito Ichii, Hironari Kanamori, Tetsuya Hiyama

Environmental Research Letters Vol. 17 ( 2 ) 2022.2

The ABCflux database: Arctic-boreal CO2 flux observations and ancillary information aggregated to monthly time steps across terrestrial ecosystems Open Access

Virkkala Anna-Maria, Natali Susan M., Rogers Brendan M., Watts Jennifer D., Savage Kathleen, Connon Sara June, Mauritz Marguerite, Schuur Edward A. G., Peter Darcy, Minions Christina, Nojeim Julia, Commane Roisin, Emmerton Craig A., Goeckede Mathias, Helbig Manuel, Holl David, Iwata Hiroki, Kobayashi Hideki, Kolari Pasi, Lopez-Blanco Efren, Marushchak Maija E., Mastepanov Mikhail, Merbold Lutz, Parmentier Frans-Jan W., Peichl Matthias, Sachs Torsten, Sonnentag Oliver, Ueyama Masahito, Voigt Carolina, Aurela Mika, Boike Julia, Celis Gerardo, Chae Namyi, Christensen Torben R., Bret-Harte M. Syndonia, Dengel Sigrid, Dolman Han, Edgar Colin W., Elberling Bo, Euskirchen Eugenie, Grelle Achim, Hatakka Juha, Humphreys Elyn, Jarveoja Jarvi, Kotani Ayumi, Kutzbach Lars, Laurila Tuomas, Lohila Annalea, Mammarella Ivan, Matsuura Yojiro, Meyer Gesa, Nilsson Mats B., Oberbauer Steven F., Park Sang-Jong, Petrov Roman, Prokushkin Anatoly S., Schulze Christopher, St Louis Vincent L., Tuittila Eeva-Stiina, Tuovinen Juha-Pekka, Quinton William, Varlagin Andrej, Zona Donatella, Zyryanov Viacheslav I.

EARTH SYSTEM SCIENCE DATA Vol. 14 ( 1 ) page： 179 - 208 2022.1

Seasonality in Human Interest in Berry Plants Detection by Google Trends Reviewed Open Access

Ayumi Kotani, Nagai Shin, Shunsuke Tei, Andrey Makarov, Tuyara Gavrilyeva

Frontiers in Forest Global Change Vol. 4 page： 688835 2021.9

Geographical, Climatological, and Biological Characteristics of Tree Radial Growth Response to Autumn Climate Change Reviewed Open Access

Shunsuke Tei, Ayumi Kotani, Atsuko Sugimoto, Nagai Shin

Frontiers in Forest Global Change Vol. 4 page： 687749 2021.8

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

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) Open Access

Pastorello G.

Scientific Data Vol. 8 ( 1 ) 2021

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

Hiyama T.

Polar Science 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

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

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 Open Access

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 Open Access

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

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 Open Access

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 Open Access

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

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Papers - KOTANI, Ayumi