A5042221251- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Atmospheric chemistry and aerosols
- Climate variability and models
- Peatlands and Wetlands Ecology
- Soil and Water Nutrient Dynamics
- Soil Carbon and Nitrogen Dynamics
- Hydrology and Watershed Management Studies
- Plant responses to elevated CO2
- Atmospheric Ozone and Climate
- Groundwater and Isotope Geochemistry
- Isotope Analysis in Ecology
- Climate change and permafrost
- Remote Sensing in Agriculture
- Climate change impacts on agriculture
- Geology and Paleoclimatology Research
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Fire effects on ecosystems
- Crop Yield and Soil Fertility
- Coastal wetland ecosystem dynamics
- Data Quality and Management
- Wastewater Treatment and Nitrogen Removal
University of Minnesota
2016-2025
University of Minnesota System
2014-2023
Texas A&M University
2021
Jet Propulsion Laboratory
2021
University of California, Los Angeles
2021
Washington State Department of Agriculture
2021
United States Department of Agriculture
2021
Earth System Science Interdisciplinary Center
2021
Marshall Space Flight Center
2021
University of California, Berkeley
2021
Abstract Terrestrial ecosystems sequester 2.1 Pg of atmospheric carbon annually. A large amount the terrestrial sink is realized by forests. However, considerable uncertainties remain regarding fate this over both short and long timescales. Relevant data to address these are being collected at many sites around world, but syntheses still sparse. To facilitate future synthesis activities, we have assembled a comprehensive global database for forest ecosystems, which includes budget variables...
Significance Global food and biofuel production their vulnerability in a changing climate are of paramount societal importance. However, current global model predictions crop photosynthesis highly uncertain. Here we demonstrate that new space-based observations chlorophyll fluorescence, an emission intrinsically linked to plant biochemistry, enable accurate, global, time-resolved measurement photosynthesis, which is not possible from any other remote vegetation measurement. Our results show...
INTRODUCTION Reliable estimation of gross primary production (GPP) from landscape to global scales is pivotal a wide range ecological research areas, such as carbon-climate feedbacks, and agricultural applications, crop yield drought monitoring. However, measuring GPP at these remains major challenge. Solar-induced chlorophyll fluorescence (SIF) signal emitted directly the core photosynthetic machinery. SIF integrates complex plant physiological functions in vivo reflect dynamics real time....
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...
The ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) was launched to the International 29 June 2018 by National Aeronautics and Administration (NASA). primary science focus of ECOSTRESS is centered evapotranspiration (ET), which produced as Level-3 (L3) latent heat flux (LE) data products. These are generated from Level-2 land surface temperature emissivity product (L2_LSTE), in conjunction with ancillary atmospheric data. Here, we provide first validation...
Significance N 2 O has 300 times the global warming potential of CO on a 100-y timescale, and is major importance for stratospheric ozone depletion. The climate sensitivity emissions poorly known, which makes it difficult to project how changing fertilizer use will impact radiative forcing layer. Here, atmospheric inverse analyses reveal that direct indirect from US Corn Belt are highly sensitive perturbations in temperature precipitation. We combine top-down constraints these with land...
Abstract The carbon and water budgets of boreal temperate broadleaf forests are sensitive to interannual climatic variability likely respond climate change. This study analyses 9 years eddy‐covariance data from the Boreal Ecosystem Research Monitoring Sites (BERMS) Southern Old Aspen site in central Saskatchewan, Canada characterizes primary controls on evapotranspiration, net ecosystem production ( F NEP ), gross photosynthesis P ) respiration R ). period was dominated by two extremes:...
Stable isotopes in water have the potential to diagnose changes earth's hydrological budget response climate change and land use change. However, there been few measurements vapour phase. Here, we present high-frequency of oxygen isotopic compositions (delta(v)) evapotranspiration (delta(ET)) above a soybean canopy using tunable diode laser (TDL) technique for entire 2006 growing season Minnesota, USA. We observed large variability surface delta(v) from daily seasonal timescales, largely...
N2O is an important greenhouse gas and the primary stratospheric ozone depleting substance. Its deleterious effects on environment have prompted appeals to regulate emissions from agriculture, which represents anthropogenic source in global budget. Successful implementation of mitigation strategies requires robust bottom-up inventories that are based emission factors (EFs), simulation models, or a combination two. Top-down estimates, tall-tower aircraft observations, indicate severely...
Plant water extracts typically contain organic materials that may cause spectral interference when using isotope ratio infrared spectroscopy (IRIS), resulting in errors the measured ratios. Manufacturers of IRIS instruments have developed post‐processing software to identify degree contamination samples, and potentially correct ratios with known contaminants. Here, correction method proposed by an manufacturer, Los Gatos Research, Inc., was employed results were compared those obtained from...
Abstract Solar‐induced fluorescence (SIF) has shown great promise for probing spatiotemporal variations in terrestrial gross primary production (GPP), the largest component flux of global carbon cycle. However, scale mismatches between SIF and ground‐based GPP have posed challenges toward fully exploiting these data. We used obtained at high spatial sampling rates resolution by NASA's Orbiting Carbon Observatory‐2 satellite to elucidate GPP‐SIF relationships across space time U.S. Corn Belt....
Abstract Wetlands are responsible for 20%–31% of global methane (CH 4 ) emissions and account a large source uncertainty in the CH budget. Data‐driven upscaling fluxes from eddy covariance measurements can provide new independent bottom‐up estimates wetland emissions. Here, we develop six‐predictor random forest model (UpCH4), trained on 119 site‐years flux data 43 freshwater sites FLUXNET‐CH4 Community Product. Network patterns site‐level annual means mean seasonal cycles were reproduced...
Boreal and temperate deciduous forests at northern mid-latitudes play an important role in the global carbon cycle. We analyze 3 years (1996-1998) of eddy-covariance dioxide flux measurements from two contrasting forest ecosystems boreal regions central Canada. The stands have similar ages, heights, leaf area indices but differ species composition climate. Mean annual net ecosystem productivity (NEP) was for ecosystems, varying between 0.7 2.7 t C·ha 1 (boreal) 0.6 2.4 (temperate). In...