A5002397985- Plant Water Relations and Carbon Dynamics
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Remote Sensing in Agriculture
- Forest ecology and management
- Peatlands and Wetlands Ecology
- Plant responses to elevated CO2
- Remote Sensing and LiDAR Applications
- Remote Sensing and Land Use
- Meteorological Phenomena and Simulations
- Fire effects on ecosystems
- Ecology and Vegetation Dynamics Studies
- Water Quality Monitoring and Analysis
- Hydrology and Watershed Management Studies
- Soil Carbon and Nitrogen Dynamics
- Environmental and Agricultural Sciences
- Atmospheric Ozone and Climate
- Coastal wetland ecosystem dynamics
- Solar Radiation and Photovoltaics
- Climate change and permafrost
- Environmental Changes in China
- Atmospheric chemistry and aerosols
- Land Use and Ecosystem Services
- Calibration and Measurement Techniques
- Forest Management and Policy
Hokkaido University
2015-2024
University of Tsukuba
2003-2017
Japan Agency for Marine-Earth Science and Technology
2005-2017
Chiba University
2016
Nagoya Institute of Technology
2015
Laboratoire des Sciences du Climat et de l'Environnement
2012-2014
Université de Versailles Saint-Quentin-en-Yvelines
2012-2014
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2012-2014
Centre National de la Recherche Scientifique
2012-2014
National Institute for Environmental Studies
2012-2013
Abstract Eleven coupled climate–carbon cycle models used a common protocol to study the coupling between climate change and carbon cycle. The were forced by historical emissions Intergovernmental Panel on Climate Change (IPCC) Special Report Emissions Scenarios (SRES) A2 anthropogenic of CO2 for 1850–2100 time period. For each model, two simulations performed in order isolate impact land ocean cycle, therefore feedback atmospheric concentration growth rate. There was unanimous agreement...
Abstract Three years of eddy covariance measurements were used to characterize the seasonal and interannual variability CO 2 fluxes above an alpine meadow (3250 m a.s.l.) on Qinghai‐Tibetan Plateau, China. This was a weak sink for atmospheric , with net ecosystem production (NEP) 78.5, 91.7, 192.5 g C −2 yr −1 in 2002, 2003, 2004, respectively. The prominent, high NEP 2004 resulted from combination gross primary (GPP) low respiration ( R e ) during growing season. period absorption 179 days,...
Forests play an important role in regional and global carbon (C) cycles. With extensive afforestation reforestation efforts over the last several decades, forests East Asia have largely expanded, but dynamics of their C stocks not been fully assessed. We estimated biomass all five Asian countries (China, Japan, North Korea, South Mongolia) between 1970s 2000s, using expansion factor method forest inventory data. Forest area density whole region increased from 179.78 × 106 ha 38.6 Mg ha−1 to...
Significance Northern forests have sequestered a substantial amount of carbon dioxide from the atmosphere during past several decades. This large (C) sink usually is considered to be driven by tree regrowth after stand-replacing disturbance and growth enhancement due environmental changes, but relative contribution between these two processes remains unclear. In this study, we evaluate induced changes biomass C in Japan’s demonstrate that accounts for 8.4–21.6% four major plantations 1980...
We present the concept of Carbon Cycle Data Assimilation System and describe its evolution over last two decades from an assimilation system around a simple diagnostic model terrestrial biosphere to for calibration initialization land component comprehensive Earth model. critically review capability this modeling framework integrate multiple data streams, assess their mutual consistency with model, reduce uncertainties in simulation carbon cycle, provide, traceable manner, reanalysis...
France is a major crop producer, with production share of approx. 20% within the European Union. Yet, discussion has recently started whether French yields are stagnating. While for wheat previous results unanimously pointing to recent stagnation, there contradictory evidence maize and few no other crops. Here we analyse data set more than 120,000 yield observations from 1900 2016 ten crops (barley, durum soft wheat, maize, oats, potatoes, rapeseed, sugar beet, sunflower wine) in 96 mainland...
While the eddy covariance (EC) technique is a well-established method for measuring water fluxes (i.e., evaporation or 'evapotranspiration', ET), measurement susceptible to many uncertainties. One such issue potential underestimation of ET when relative humidity (RH) high (>70%), due low-pass filtering with some EC systems. Yet, this different types systems (e.g. open-path closed-path sensors) has not been characterized synthesis datasets as widely used FLUXNET2015 dataset. Here, we assess...
Abstract Alpine ecosystems are extremely vulnerable to climate change. To address the potential variability of responses alpine change, we examined daily CO 2 exchange in relation major environmental variables. A dataset was obtained from an meadow on Qinghai‐Tibetan Plateau eddy covariance measurements taken over 3 years (2002–2004). Path analysis showed that soil temperature at 5 cm depth ( T s5 ) had greatest effect variation ecosystem all year around, whereas photosynthetic photon flux...
Abstract Asian terrestrial ecosystems cover an extensive area characterized by a large variety in climates and ecosystem properties. The observations of CO 2 flux this are increasing both duration spatial density, but no synthesis has yet been conducted. We surveyed observation data obtained eddy covariance methods at 49 sites Asia. measurements most (44 49) began after 2000. net uptake (NEE) varied greatly among years averaged −132.6±73.7, −250.1±206.1, −180.1±361.7 g C m −2 yr −1 , boreal,...
To characterize evapotranspiration (ET) over grasslands on the Qinghai‐Tibetan Plateau, we examined ET and its relevant environmental variables in a Kobresia meadow from 2002 to 2004 using eddy covariance method. The annual precipitation changed greatly, with 554, 706, 666 mm −1 for three consecutive calendar years. varied correspondingly 341, 407, 426 . was, however, constant at about 60% of precipitation. About 85% occurred during growing season May September, averaged this period was...
Forest biomass is a crucial component of the global carbon budget in climate change studies. Therefore, it essential to develop credible way estimate forest as stock. Our study used PALSAR-2 (ALOS-2) and Sentinel-2 images drive Random regression model, which we trained with airborne lidar data. We model aboveground (AGB) two significant coniferous trees, Japanese cedar cypress, Ibaraki Prefecture, Japan. 48 variables derived from remote sensing datasets predict AGB under algorithm, found...
Global forests face severe challenges owing to climate change, making dynamic and accurate monitoring of forest conditions critically important. Forests in Japan, covering approximately 70% the country's land area, play a vital role yet often overlooked global forestry. Japanese are unique, with 50% comprising artificial forests, predominantly coniferous forests. Despite government's extensive use airborne Light Detecting Ranging (LiDAR) assess conditions, these data need more availability...
Global forests face severe challenges owing to climate change, making dynamic and accurate monitoring of forest conditions critically important. Forests in Japan, covering approximately 70% the country's land area, play a vital role yet often overlooked global forestry. Japanese are unique, with 50% comprising artificial forests, predominantly coniferous forests. Despite government's extensive use airborne Light Detecting Ranging (LiDAR) assess conditions, these data need more availability...
Forest ecosystems in the Northern Hemisphere function as carbon (C) sinks for atmospheric dioxide; however, magnitude, location, and cause of remain uncertain. A number field measurements forest biomass systematic national inventories Japan make it possible to quantify C their distribution. Allometric relationships between stem volume were obtained major types from 945 sets direct across country. These used estimate changes accumulations aboveground total living 1947 1995 1947, 1956, 1961,...
Abstract A new reconstruction of changes in Taiwan’s land cover and estimated uncertainty between 1904 2015 is presented. The made by integrating geographical information from historical maps SPOT satellite images, to obtain spatially explicit with a resolution 500 × m distinguishes six classes: forests, grasslands, agricultural land, inland water, built-up bare soil. temporal unbalanced being derived four describing the 1994 five mosaic images 1995 2015. quantified show aggregation error...