A5100457021- Plant Water Relations and Carbon Dynamics
- Meteorological Phenomena and Simulations
- Fluid Dynamics and Turbulent Flows
- Climate variability and models
- Wind and Air Flow Studies
- Atmospheric and Environmental Gas Dynamics
- Advanced Harmonic Analysis Research
- Mathematical Analysis and Transform Methods
- Cryospheric studies and observations
- Advanced Mathematical Physics Problems
- Fire effects on ecosystems
- Oceanographic and Atmospheric Processes
- Hydrology and Watershed Management Studies
- Nonlinear Partial Differential Equations
- Climate change and permafrost
- Atmospheric aerosols and clouds
- Chinese history and philosophy
- Advanced Multi-Objective Optimization Algorithms
- Aeolian processes and effects
- Remote Sensing and Land Use
- Soil and Unsaturated Flow
- Spectral Theory in Mathematical Physics
- Environmental and Agricultural Sciences
- Marine and coastal ecosystems
- Advanced Algebra and Geometry
Washington State University
2016-2025
University of Washington Applied Physics Laboratory
2024
Guangdong University of Petrochemical Technology
2024
Michigan State University
2024
University of Kansas
2024
Bridge University
2024
China Building Standard Design and Research Institute (China)
2023
China Geological Survey
2023
Peking University
2011-2021
China Iron and Steel Research Institute Group
2006-2020
A comprehensive 30×30 arc‐second resolution gridded soil characteristics data set of China has been developed for use in the land surface modeling. It includes physical and chemical attributes soils derived from 8979 profiles Soil Map (1:1,000,000). We used polygon linkage method to derive spatial distribution properties. The profile attribute database map are linked under framework Genetic Classification which avoids uncertainty taxon referencing. Quality control information (i.e., sample...
Large datasets of greenhouse gas and energy surface-atmosphere fluxes measured with the eddy-covariance technique (e.g., FLUXNET2015, AmeriFlux BASE) are widely used to benchmark models remote-sensing products. This study addresses one major challenges facing model-data integration: To what spatial extent do flux measurements taken at individual sites reflect model- or satellite-based grid cells? We evaluate footprints—the temporally dynamic source areas that contribute fluxes—and...
Drylands cover 41% of Earth's surface and are the largest source interannual variability in global carbon sink. projected to experience accelerated expansion over next century, but implications this on gross primary production (GPP) remain elusive. Here we show that by 2100 total dryland GPP will increase 12 ± 3% relative 2000-2014 baseline. Because drylands largely expand into formerly productive ecosystems, may not GPP. Further, per unit area decrease as degradation historical outpaces...
Understanding links between the disturbance regime and regional climate in boreal regions requires observations of surface energy budget from ecosystems various stages secondary succession. While several studies have characterized fire‐induced differences fluxes during summer months, much less is known about these over full annual cycle. Here we measured components (including both radiative turbulent fluxes) at three sites a fire chronosequence interior Alaska for 1‐year period. Our...
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems is critical to predict future levels of atmospheric dioxide because potential accelerating effects positive climate–carbon cycle feedbacks. However, directly observed CO2 with atmosphere across biomes continents are lacking. Here we present data describing net ecosystem (NEE) factors as measured using eddy covariance method at 125 unique sites in various over six a total 559 site-years. We find that...
[1] Basal ecosystem respiration rate (BR), the at a given temperature, is common and important parameter in empirical models for quantifying (ER) globally. Numerous studies have indicated that BR varies space. However, many ER still use global constant largely due to lack of functional description BR. In this study, we redefined be mean annual temperature. To test validity concept, conducted synthesis analysis using 276 site-years eddy covariance data, from 79 research sites located...
CO2 emissions from inland waters are commonly determined by indirect methods that based on the product of a gas transfer coefficient and concentration gradient at air water interface (e.g., wind-based models). The measurements typically collected during day in fair weather throughout course year. Direct eddy covariance fluxes large body (Ross Barnett reservoir, Mississippi, USA) show effluxes night approximately 70% greater than those day. At longer time scales, frequent synoptic events...
Abstract Accounting for temporal changes in carbon dioxide (CO 2 ) effluxes from freshwaters remains a challenge global and regional budgets. Here, we synthesize 171 site-months of flux measurements CO based on the eddy covariance method 13 lakes reservoirs Northern Hemisphere, quantify dynamics at multiple scales. We found pronounced sub-annual variability all sites. By accounting diel variation, only 11% were net daily sinks . Annual emissions had an average 25% (range 3%–58%) interannual...
Eddy covariance measurements of sensible (H) and latent (LE) heat fluxes were made over a large southern open water surface Ross Barnett Reservoir (the hereafter) in Mississippi during the cool season with frequent incursions cold fronts from 1 September 2007 to 31 January 2008. The eddy tower was located middle main body fetches exceeding 2.0 km all directions. ice‐free winter temperatures always decreased depth. Over entire season, averaged 1.8°C higher than overlying air (i.e., positive...
Soil temperature and moisture are important factors that control many ecosystem processes. However, interactions between soil thermal hydrological processes not adequately understood in cold regions, where the frozen soil, fire disturbance, drainage play roles controlling among these These were investigated with a new model framework, dynamic organic version of Terrestrial Ecosystem Model, incorporates an efficient stable numerical scheme for simulating dynamics within profiles contain live...
It is now accepted that large-scale turbulent eddies impact the widely reported non-closure of surface energy balance when latent and sensible heat fluxes are measured using eddy covariance method in atmospheric layer (ASL). However, a mechanistic link between large remains subject inquiry. Here, 10 Hz time series vertical velocity, air temperature, water vapor density collected ASL analyzed for conditions where entrainment and/or horizontal advection separately predominate. The decomposed...
Abstract The authors analyzed the surface energy fluxes that were measured by an eddy covariance system over Ross Barnett Reservoir in Mississippi for a 1-yr period 2008. On monthly basis course of year, positive vertical temperature and vapor pressure differences observed, though negative occurred occasionally during some short periods when overwater air masses warmer than water surface. Consequently, unstable atmospheric layer (ASL) sufficient mechanical mixing led to sensible H latent λE...
Abstract There are no direct methods to evaluate calculated soil heat flux (SHF) at the surface ( G 0 ). Instead, validation and cross evaluation of for calculating usually rely on conventional calorimetric method or degree energy balance closure. However, there is uncertainty in itself, factors apart from also contribute nonclosure balance. Here we used a novel approach nine different SHF, including based analytical solutions diffusion equation. The SHF z ) measured by self‐calibrating...
Understanding how changes in the boreal fire regime will affect high latitude climate requires knowledge of sensitivity surface energy budget to shifts vegetation cover. We measured components three ecosystems that were part a chronosequence interior Alaska for 3 years. Our sites within perimeter stand‐replacing fires occurred 1999, 1987, and ∼1920 (hereafter referred as 1999‐burn, 1987‐burn, control). Vegetation cover consisted primarily sparse short grasses at aspen willow (deciduous trees...
Abstract Turbulence structures and exchange of momentum heat in the nocturnal stable boundary layer (SBL) show distinct features under different stability conditions prompting interest their connection. Here eddy covariance data collected at four heights on a 62‐m meteorological tower over large open flat terrain are used to characterize SBL states associated turbulence structures. In characterized by strong near‐surface winds, turbulent sizes scale with observational experiences enhanced...
Abstract How large turbulent eddies influence non‐closure of the surface energy balance is an active research topic that cannot be uncovered by mean continuity equation in isolation. It demonstrated here asymmetric flux transport heat and water vapor sweeps ejections under unstable atmospheric stability conditions reduce fluxes. Such asymmetry causes positive gradients third‐order moments budget equations, primarily attributed to substantially reduced contributions sustained ejections....