A5063315606- Plant Water Relations and Carbon Dynamics
- Asymmetric Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Cryospheric studies and observations
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Climate change and permafrost
- Particle physics theoretical and experimental studies
- Atmospheric and Environmental Gas Dynamics
- Tree-ring climate responses
- Advanced Synthetic Organic Chemistry
- Phosphorus compounds and reactions
- Forest ecology and management
- Fire effects on ecosystems
- Climate variability and models
- Plant responses to elevated CO2
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Remote Sensing in Agriculture
- Remote Sensing and LiDAR Applications
- Chemical Synthesis and Analysis
- Chemical Synthesis and Reactions
- Aeolian processes and effects
- Organophosphorus compounds synthesis
- Soil and Unsaturated Flow
- Cyclopropane Reaction Mechanisms
University of Alaska Fairbanks
2011-2024
National Taiwan University
2019-2024
Tottori University
2020
Nagoya University
2013-2019
Osaka City University
2011-2014
Norsk Hydro (Slovakia)
2014
International Arctic Research Center
2011-2013
Institute of Particle Physics
2013
University of Alberta
2013
University of California, Irvine
2013
Measurements of eddy fluxes are premised on the assumption that wind velocities measured accurately by an ultrasonic anemometer. Recently, Gill anemometers have been shown to suffer errors depending angle attack, which is between vector and horizontal. The correction these results in general flux increases. However, since calibration for error dependent attack was carried out a tunnel experiment under conditions nearly laminar flow, applicability this field data turbulent has questioned. In...
Abstract Eddy covariance flux research has relied on open‐ or closed‐path gas analyzers for producing estimates of net ecosystem exchange carbon dioxide ( CO 2 ) and water vapor H O ). The two instruments have had different challenges that led to development an enclosed design is intended maximize strengths minimize weaknesses both traditional designs. Similar the analyzer, leads minimal data loss during precipitation events icing, it does not surface heating issues. open‐path design, good...
Abstract The memory timescale that characterizes root‐zone soil moisture remains the dominant measure in seasonal forecasts of land‐climate interactions. This is a quasi‐deterministic associated with losses (e.g., evapotranspiration) from column and often interpreted as persistence states. Persistence, however, represents distribution time periods where resides above or below some prescribed threshold therefore inherently probabilistic. Using multiple data sets collected at high resolution...
Carbon dioxide (CO 2 ) fluxes from a network of 21 eddy covariance towers were upscaled to estimate the Alaskan CO budget 2000 2011 by combining satellite remote sensing data, disturbance information, and support vector regression model. Data compared with an inverse model (CarbonTracker). Observed gross primary productivity (GPP), ecosystem respiration (RE), net exchange (NEE) each well reproduced on site scale; root‐mean‐square errors (RMSEs) for GPP, RE, NEE 0.52, 0.23, 0.48 g C m −2 d −1...
Here, the year 2011 characteristics of evapotranspiration and energy budget a black spruce forest underlain by permafrost in interior Alaska were explored. Energy balance was nearly closed during summer, mean value daily ratio (the turbulent fluxes to available energy) from June August 1.00, though large deficit observed spring. Such explained partly consumed snowmelt. Ground heat flux played an important role balance, explaining 26.5% net radiation summer. The this summer 1.37 mm day−1 –...
Cell behavior in the cambium and developing xylem of 3-year-old Japanese cedar (Cryptomeria japonica D. Don.) trees, during after an 11-day suspension irrigation, was analyzed. Leaf pressure potential tangential strain stem surface were monitored throughout experiment. Anatomical features numbers tracheids cambial cells observed four sampled on Days 0, 4, 8 11 irrigation suspended. Daytime decreased to -1.9 MPa Day 7 remained same until resumed 11. The transverse dimensions tracheids, which...
Abstract. Eddy covariance observations play a pivotal role in understanding the land–atmosphere exchange of energy, water, carbon dioxide (CO2), and other trace gases, as well global cycle earth system. To promote networking individual measurements sharing data, FLUXNET links regional networks researchers studying processes. JapanFlux was established 2006 country branch AsiaFlux. Despite growing number shared data globally, availability Asia is currently limited. In this study, we developed...
Abstract
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[2,3]-Wittig rearrangement of unsymmetrical bis-allylic ethers. Facile method for regio- and stereoselective synthesis 1,5-dien-3-olsT. Nakai, K. Mikami, S. Taya, Y. FujitaCite this: J. Am. Chem. Soc. 1981, 103, 21, 6492–6494Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published inissue 1 October 1981https://pubs.acs.org/doi/10.1021/ja00411a038https://doi.org/10.1021/ja00411a038research-articleACS...
<ja:p>We developed a ground-based method for estimating leaf area index (LAI) and vertical distribution of density (LAD) two Betula ermanii plots, combining an allometric tree with the MacArthurâHorn (MH) using portable laser rangefinder, including correction changes in inclination angle along gradient measured digital protractor from canopy access tower each plot. Vertical projected obtained by MH (LADMH) was transformed to relative allotting fixed LAI different heights. Hence, we first...
Abstract Warming in northern high latitudes has changed the energy balance between terrestrial ecosystems and atmosphere. This study evaluated changes regional surface exchange Alaska from 2000 to 2011 when substantial declines spring snow cover due warming large‐scale fire events were observed. Energy fluxes a network of 20 eddy covariance sites upscaled using support vector regression (SVR) model, by combining satellite remote sensing data global climate data. Based on site‐scale analysis,...
Abstract Spring snowmelt occurs for a short duration on an annual time scale, but their timings considerably affect the carbon and hydrological cycle in high‐latitude ecosystems. Here, we developed simple model, treating ecosystem surface as bulk‐surface layer. Energy fluxes across this bulk snow‐soil boundary determine snow temperature energy utilized snowmelt. Parameterizing using decade‐long eddy covariance site data from two Alaskan open black spruce forests offered opportunity to...