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I am a broadly trained plant ecologist, with a bachelor’s degree in Botany and a PhD in Ecology and Evolutionary Biology. I use ecological knowledge and quantitative models to improve mechanistic understanding of the uptake, storage and release of carbon from ecosystems to provide accurate predictions of the role of terrestrial ecosystems in global biogeochemical cycles. Topics of study include: Ecosystem Ecology. Ecophysiology, Phenology, Ecohydrology, Biogeochemistry, Geospatial Science and Modeling, Global Change Biology, Remote Sensing.
I teach a general education course called Sustainable Earth (INDIV 150C) where we consider society’s use of natural resources and the environment. I also teach an upper undergraduate and graduate course on Earth’s Changing Carbon Cycle (RNR 427/527) and contribute lectures and sections on photosynthesis, ecosystem ecology and sustainability to other classes as needed. I also teach seminar classes focusing on professional and scientific development for graduate students and organise occasional workshops for Postdoctoral Researchers. Since 2008, in the summer I organize and teach a two week Summer Course in Flux Modeling and Advanced Measurements called the Fluxcourse, supported by NSF and DOE through the Ameriflux program.
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Courses
- NRMPNatural Resources Management Practices
- ECCCEarth's Changing Carbon Cycle
- SENRESustainable Earth: Natural Resources and the Environment
- EESFEcosystem Ecology and a Sustainable Future
- GSNRGlobal Sustainability and Natural Resources
Grants
- AccelNet-Implementation: FLUXNET 2025 - A Global Network of Networks to Understand Ecosystem Function Through Continuous Observations of Ecosystem-Atmosphere Interactions
Principal Investigator (PI)
2022
$109.5K
Active - Improving Mechanistic Representation of Arctic Carbon Dynamics Using Data Assimilation
Principal Investigator (PI)
2019
$799.2K
Active - Prototyping a Data Assimilation Sys for Global Data Products for Upcoming ISS Missions Unsing Community Earth System Model
Principal Investigator (PI)
2017
$91.3K
- Ecosystem Water and Carbon Cycling Across the Semiarid Western U.S.
Principal Investigator (PI)
2016
$125.2K
- COLLABORATIVE RESEARCH: EAGER-NEON: Prototyping Assessment of Ecoclimate Teleconnections Affecting NEON Domains
Co-Investigator (COI)
2015
$113.9K
- Collaborative Research and NEON: MSB Category 2: PalEON- a PaleoEcological Observatory Network to Assess Terrestrial Ecosystem Models
Principal Investigator (PI)
2013
$1.1M
- Estimating Carbon Flux and Storage: Constraint of the Community Land Model using Observations at Different Temporal Scales
Principal Investigator (PI)
2013
$952.4K
- RAPID Proposal: Modification of the impact of insect disturbance on carbon cycling by fire
Principal Investigator (PI)
2012
$199.7K
News
- UA Faculty Use Twitter to Get Students Focused In and Out of Class
2013
- Dead Forests Release Less Carbon Into Atmosphere Than Expected
2013
Publications (196)
Recent
- A framework for incorporating ecology into Earth System Models is urgently needed
2022
- Coupling of Tree Growth and Photosynthetic Carbon Uptake Across Six North American Forests
2022
- Canopy temperature is regulated by ecosystem structural traits and captures the ecohydrologic dynamics of a semiarid mixed conifer forest site
2022
- Assimilation of Global Satellite Leaf Area Estimates Reduces Modeled Global Carbon Uptake and Energy Loss by Terrestrial Ecosystems
2022
- The policy and ecology of forest-based climate mitigation: challenges, needs, and opportunities
2022
- Length of growing season is modulated by Northern Hemisphere jet stream variability.
2021
- Integrating the evidence for a terrestrial carbon sink caused by increasing atmospheric CO2.
2021
- A reporting format for leaf-level gas exchange data and metadata
2021
- Improved dryland carbon flux predictions with explicit consideration of water-carbon coupling
2021
- Precipitation alters the CO2 effect on water-use efficiency of temperate forests.
2021
- Forest responses to last-millennium hydroclimate variability are governed by spatial variations in ecosystem sensitivity.
2021
- Large‐Scale Reductions in Terrestrial Carbon Uptake Following Central Pacific El Niño
2021
- High productivity in hybrid-poplar plantations without isoprene emission to the atmosphere
2020
- Globally Consistent Patterns of Asynchrony in Vegetation Phenology Derived From Optical, Microwave, and Fluorescence Satellite Data
2020
- Woodchip and biochar amendments elicit different microbial responses and revegetation success in semi-arid ecosystem soils
2020
- Testing water fluxes and storage from two hydrology configurations within the ORCHIDEE land surface model across US semi-arid sites
2020
- Constraining estimates of terrestrial carbon uptake: new opportunities using long-term satellite observations and data assimilation
2020
- Woodchip and biochar amendments differentially influence microbial responses, but do not enhance plant recovery in disturbed semiarid soils
2020
- Forest responses to last-millennium hydroclimate variability are governed by spatial variations in ecosystem sensitivity
2020
- Topography influences species-specific patterns of seasonal primary productivity in a semiarid montane forest
2020
- Climate sensitivity of understory trees differs from overstory trees in temperate mesic forests
2020
- Does weather trigger urologic chronic pelvic pain syndrome flares? A case-crossover analysis in the multidisciplinary approach to the study of the chronic pelvic pain research network
2020
- High Vapor Pressure Deficit Decreases the Productivity and Water Use Efficiency of Rain-Induced Pulses in Semiarid Ecosystems
2020
- Integrating the evidence for a terrestrial carbon sink caused by increasing atmospheric CO 2
2020
- Seasonal jet stream controls on surface climate influence the timing of plant growth: a mechanistic perspective on landscape phenology shifts in a warming world
2019
- Predicting productivity: Ecological forecasting in the Earth System
2019
- Remote sensing of dryland ecosystem structure and function: Progress, challenges, and opportunities
2019
- The influence of vapor pressure deficit on rain-induced pulses of land-air carbon exchange in drylands
2019
- Examining the effects of state factors on ecosystem carbon fluxes in North America.
2019
- More than NEE: The rich problem-solving potential of land-atmosphere flux observation networks
2019
- Environmental and Vegetative Controls on Soil CO<sub>2</sub> Efflux in Three Semiarid Ecosystems
2019
- The Changing North American Carbon Cycle: Projections, Consequences and Research Priorities
2019
- Buried woodchips or biochar as a means of soil productivity and carbon restoration: Effects on microbial activities, soil carbon cycling and plant cover in a semiarid ecosystem
2019
- Linking drought legacy effects across scales: From leaves to tree rings to ecosystems
2019
- Multi-variable, multi-configuration testing of ORCHIDEE land surface model water flux and storage estimates across semi-arid sites in the southwestern US
2019
- Constraining the terrestrial CO 2 fertilization effect using satellite observations: Opportunities and challenges
2019
- Unraveling Ecosystem Carbon Uptake into its Component Plant Species Contributions using Phenology
2019
- A case-crossover analysis of weather as a urologic chronic pelvic pain syndrome flare trigger in the Multidisciplinary Approach to the Study of Chronic Pelvic Pain (MAPP) Research Network
2019
- Terrestrial biosphere models underestimate the mean and inter-annual variability of net CO 2 fluxes in semi-arid ecosystems
2019
- Large-scale reductions in terrestrial carbon uptake due to central Pacific El Niño revealed by remote sensing and land surface models
2019
- Monitoring diurnal to seasonal vegetation photosynthesis across key dryland ecosystem types using near-surface remote sensing techniques
2019
- Environmental and Vegetative Controls on Soil CO2 Efflux in Three Semiarid Ecosystems
2019
- Reducing Uncertainty in Global Carbon Fluxes from the Community Land Model through Data Assimilation
2019
- Growth and opportunities in networked synthesis through AmeriFlux
2019
- Understanding the relationship between vegetation greenness and productivity across dryland ecosystems through the integration of PhenoCam, satellite, and eddy covariance data
2019
- Seasonal and synoptic climatic drivers of tree growth in the Bighorn Mountains, WY, USA (1654--1983 CE)
2019
- Quantifying plant physiological response to water stress with high-frequency, near-surface observations of chlorophyll fluorescence and photochemical reflectivity
2018
- Satellite-based constraints on terrestrial CO 2 fertilization: Challenges and opportunities
2018
- Continental-scale consequences of tree die-offs in North America (Invited)(344139)
2018
- Biogeochemical Effects of Rising Atmospheric CO2 on Terrestrial and Ocean Systems
2018
- Continental-scale consequences of tree die-offs in North America
2018
- Regional loss of long-lived tree species reduces the capacity of the biosphere to store carbon over centuries
2018
- Monitoring dryland vegetation dynamics from space
2018
- Biophysical and Vegetative Controls on Soil Carbon Dioxide Efflux in the Semiarid Southwest US
2018
- What impact do plant and soil hydrologic schemes of varying complexity have on simulated water and carbon fluxes across semi-arid sites in the southwestern US?
2018
- When and where are plants responding to synoptic circulations?
2018
- When tree rings go global: challenges and opportunities for retro-and prospective insight
2018
- Chlorophyll fluorescence better captures seasonal and interannual gross primary productivity dynamics across dryland ecosystems of southwestern North America
2018
- Lessons from the semi-arid West: drought controls carbon uptake dynamics in mesic Eastern US forests
2018
- Productivity and Climate Responses to Forest loss in North American Ecoregions
2018
- Comparisons of Global Land Surface Phenology Derived from Vegetation Greenness, Optical Depth, and Solar-induced Chlorophyll Fluorescence
2018
- Evaluation of a Data Assimilation System for Land Surface Models using CLM4. 5
2018
- The effects of rising CO 2 on terrestrial ecosystems: The state of the carbon cycle
2018
- Reducing Uncertainty in Global Carbon Fluxes from the Community Land Model Through Assimilating Remotely-Sensed Land Surface Properties
2018
- Continental-scale consequences of tree die-offs in North America: identifying where forest loss matters most
2018
- Determination of Death Dates of Coarse Woody Debris of Multiple Species in the Central Hardwood Region (Indiana, USA)
2018
- Biogeochemical and Functional Consequences of Vegetation Changes in the Anthropocene II
2018
- Upscaling Ameriflux observations to assess drought impacts on gross primary productivity across the Southwest
2017
- Disturbance alters the relative importance of topographic and biogeochemical controls on microbial activity in temperate montane forests
2017
- CMIP5 land surface models systematically underestimate inter-annual variability of net ecosystem exchange in semi-arid southwestern North America.
2017
- GC21F-0997: Understanding the relationship between vegetation phenology and productivity across key dryland ecosystem types through the integration of PhenoCam, satellite, and eddy covariance data
2017
- Future Projections and Consequences of the Changing North American Carbon Cycle
2017
- Climatic history of the northeastern United States during the past 3000 years
2017
- Topographic and geochemical controls on microbial activity in undisturbed and disturbed forests.
2017
- Predicting Tree Mortality Die-off Events Associated with Hotter Drought and Assessing Their Global Consequences via Ecoclimate Teleconnections. (Invited)
2017
- Initializing carbon cycle predictions from the Community Land Model by assimilating global biomass observations
2017
- Inferring biogeochemistry past: a millennial-scale multimodel assimilation of multiple paleoecological proxies.
2017
- PP51C-1077: Summer Temperature Extremes in the Northern Rockies: A Tree-Ring-Based Reconstruction (1670-2014) from the Bighorn Mountains, WY
2017
- B43I-03: Initializing carbon cycle predictions from the Community Land Model by assimilating global biomass observations (Invited)
2017
- Relative influences of multiple sources of uncertainty on cumulative and incremental tree-ring-derived aboveground biomass estimates
2017
- Beyond greenness: Detecting temporal changes in photosynthetic capacity with hyperspectral reflectance data
2017
- Evidence of a robust relationship between solar-induced chlorophyll fluorescence and gross primary productivity across dryland ecosystems of southwestern North America
2017
- Determination of Death Dates of Coarse Woody Debris of Multiple Species in the Central Hardwood Region (Indiana, USA).
2017
- Emergent climate and CO2 sensitivities of net primary productivity in ecosystem models do not agree with empirical data in temperate forests of eastern North America
2017
- Future Projections and Consequences of the Changing North American Carbon Cycle (Invited)
2017
- When tree rings go global: challenges and opportunities for retro- and prospective insight
2017
- GC21F-0996: Upscaling Ameriflux observations to assess drought impacts on gross primary productivity across the Southwest
2017
- Evaluating the effect of alternative carbon allocation schemes in a land surface model (CLM4. 5) on carbon fluxes, pools, and turnover in temperate forests
2017
- The AmeriFlux network: A coalition of the willing
2017
- Impacts of paleo-climatic variability on ecosystem stability and model performance in the modern era
2016
- Validating the Spring Jet Stream Indices Using Extended Spring Index (SI-x) Models
2016
- Accounting for Ecoclimate Teleconnections that structure ecological responses to disturbance and climate, from local to global scales
2016
- The future of the North American carbon cycle-projections and associated climate change
2016
- State of the Carbon Cycle-Consequences of Rising Atmospheric CO 2
2016
- A Model-Data Intercomparison of Carbon Fluxes, Pools, and LAI in the Community Land Model (CLM) and Alternative Carbon Allocation Schemes
2016
- Using phenocams to monitor our changing earth: Toward a global phenocam network
2016
- Water stress reduces evaporative cooling in hybrid poplars during hot drought: genotype influences degree of coupling between thermal stress and atmosphere
2016
- Carbon isotopic composition of forest soil respiration in the decade following bark beetle and stem girdling disturbances in the Rocky Mountains
2016
- Stand structure and composition provide differential tree-ring growth signals in eastern US forests
2016
- Combining Ecosystem Observations, Manipulations and the Data Assimilation Research Testbed to Provide New Insights into Community Land Model Performance
2016
- The plant phenology monitoring design for the national ecological observatory network
2016
- Interactions between temperature and intercellular CO<inf>2</inf> concentration in controlling leaf isoprene emission rates
2016
- Vegetation productivity responds to sub-annual climate conditions across semiarid biomes
2016
- Vegetation response to climate variability in the Southwestern United States.
2016
- Comparing Different Model Structures for Carbon Allocation in the Community Land Model (CLM)
2015
- The roles of trees In the Critical Zone
2015
- Disturbance-driven Changes in Soil Exoenzyme Activity and Biogeochemistry of Colorado Forests
2015
- Reconstructing Above Ground Forest Biomass Increment and Uncertainty Using Tree-ring Data
2015
- Constraining Ecosystem Carbon Uptake and Long-Term Storage with Integrated Modeling, Experiment, and Observation IV
2015
- Millennial-scale drivers of carbon storage and flux in terrestrial ecosystem models
2015
- The loss of late successional species has a disproportionate impact on terrestrial carbon storage in North America
2015
- Ecosystem composition changes over the past millennium: model simulations and comparison with paleoecological observations
2015
- Changes in soil biogeochemistry following disturbance by girdling and mountain pine beetles in subalpine forests
2015
- Physiology and Thermal Imaging of Poplar Hybrids with Varying Temperature Tolerance
2014
- Training young scientists across empirical and modeling approaches
2014
- Statistical Estimates of the Long-Term Impact of Land-Use Disturbance on Woody Biomass in the Midwest (USA)
2014
- Constraining Centennial-Scale Ecosystem-Climate Interactions with a Pre-colonial Forest Reconstruction across the Upper Midwest and Northeastern United States
2014
- Joint data assimilation of satellite reflectance and net ecosystem exchange data constrains ecosystem carbon fluxes at a high-elevation subalpine forest
2014
- Soil carbon cycle 13C responses in the decade following bark beetle and girdling disturbance
2014
- Constraining Ecosystem Carbon Uptake and Long-Term Storage Using Models and Data II
2014
- Phenology Data Products to Support Assessment and Forecasting of Phenology on Multiple Spatiotemporal Scales
2014
- Assimilating Multiple Data Types in the Community Land Model (CLM) for Deciduous Forests in North America
2014
- A tree-ring perspective on the terrestrial carbon cycle
2014
- Assessing the long-term performance of terrestrial ecosystem models in northeastern United States: linking model structure and output
2014
- Uncertainty analysis of modeled carbon and water fluxes in a subtropical coniferous plantation
2013
- Megasplash at Lake Tahoe
2013
- Forecasting net ecosystem CO<inf>2</inf> exchange in a subalpine forest using model data assimilation combined with simulated climate and weather generation
2013
- Persistent reduced ecosystem respiration after insect disturbance in high elevation forests
2013
- Soil microbial respiration from observations and Earth System Models
2013
- Forecasting net ecosystem CO2 exchange in a subalpine forest using model data assimilation combined with simulated climate and weather generation
2013
- Constraining the Carbon Cycle through Tree Rings: A Case Study of the Valles Caldera, NM
2013
- The false spring of 2012, earliest in North American record
2013
- Modeling carbon cycle responses to tree mortality: linking microbial and biogeochemical changes
2013
- The effects of biotic disturbances on carbon budgets of North American forests
2012
- Effects of biotic disturbances on forest carbon cycling in the United States and Canada
2012
- The Effects of Insect and Pathogen Outbreaks on the Carbon Cycle: A Review
2012
- Seasonal pattern of regional carbon balance from the Airborne Carbon in the Mountains Experiment 2007
2011
- Observatory enabled modeling of the Global Carbon Cycle
2011
- Changes in carbon balance after insect disturbance in Western US forests
2011
- Detecting trends in regional ecosystem functioning: the importance of field data for calibrating and validating NEON airborne remote sensing instruments and science data products
2011
- a Model-Data Fusion Approach to Integrate National Ecological Observatory Network Observations Into AN Earth System Model
2011
- Process coupling and control over the response of net ecosystem CO2 exchange to climate variability and insect disturbance in subalpine forests of the Western US
2011
- Seasonal pattern of regional carbon balance in the central Rocky Mountains from surface and airborne measurements
2011
- A primer for data assimilation with ecological models using Markov Chain Monte Carlo (MCMC)
2011
- Using historical data to constrain long term carbon dynamics in land surface models: processes and data
2011
- Mountain pine beetle disturbance effects on soil respiration and nutrient pools
2011
- Do physiological changes at leaf level explain seasonal changes in remotely sensed canopy greenness?
2011
- NEON 2011 Science Strategy; Enabling continental-scale ecological forecasting.
2011
- Spring Indices (SI): National (and Global) Indicators of Climate Impacts on Ecosystems and Society
2011
- G04009 Seasonal partem of regional carbon balance in the central Rocky Mountains from surface and airborne measurements (doi 10.1029/2011JG001655)
2011
- NEON science strategy: enabling continental-scale ecological forecasting
2011
- Increases in the flux of carbon belowground stimulate nitrogen uptake and sustain the long-term enhancement of forest productivity under elevated CO2
2011
- Climatic Controls on Carbon Exchange in the US Mountain West at Multiple Scales
2010
- A Review of Carbon Cycle Impacts of Biotic Disturbances in North American Forests
2010
- A multiscale and multidisciplinary investigation of ecosystem-atmosphere CO<inf>2</inf> exchange over the rocky mountains of colorado
2010
- Phenological control over ecosystem-atmosphere carbon exchange
2010
- Longer growing seasons lead to less carbon sequestration by a subalpine forest
2010
- Interspecific variation in susceptibility to fungal pathogens in seeds of 10 tree species in the neotropical genus Cecropia
2010
- A MULTISCALE AND MULTIDISCIPLINARY INVESTIGATION OF ECOSYSTEM--ATMOSPHERE CO
2010
- Changes in carbon uptake and release cause by insect outbreaks in the Colorado Rocky Mountains from 2000 through 2010
2010
- Modeling whole-tree carbon assimilation rate using observed transpiration rates and needle sugar carbon isotope ratios
2010
- Development of a Data Assimilation System to Study Ecosystem Exchange of Carbon at the National Scale Using Data from the National Ecological Observatory Network
2010
- A multiscale and multidisciplinary investigation of ecosystem-atmosphere CO2 exchange over the Rocky Mountains of Colorado
2010
- Mountain Pine beetle disturbance and climate effects on subalpine forest carbon cycling
2010
- Estimating parameters of a forest ecosystem C model with measurements of stocks and fluxes as joint constraints
2010
- Weather and climate controls over the seasonal carbon isotope dynamics of sugars from subalpine forest trees
2010
- Uncertainty of regional carbon fluxes and boundary layer heights in complex terrain: The airborne carbon in the mountains experiment 2007
2009
- Photosynthesis, plant growth and nitrogen nutrition in Alaskan tussock tundra: Response to experimental warming
2009
- Controls over ozone deposition to a high elevation subalpine forest
2009
- Estimating Parameters of a Forest Ecosystem C Model Using Multiple Stock and Flux Measurements as Joint Constraints
2009
- COS 119-9: Carbon cycling at in a temperate evergreen forest: a multi-model data-model fusion analysis at Howland, ME
2009
- Carbon cycling at a temperate evergreen forest: a comparison of three ecosystem-model data assimilation systems at Howland, ME
2009
- Control over ecosystem CO2 exchange by winter snow versus summer rain in a subalpine coniferous forest
2008
- Estimating transpiration and the sensitivity of carbon uptake to water availability in a subalpine forest using a simple ecosystem process model informed by measured net CO 2 and H 2 O fluxes
2008
- Estimating transpiration and the sensitivity of carbon uptake to water availability in a subalpine forest using a simple ecosystem process model informed by measured net CO<inf>2</inf> and H<inf>2</inf>O fluxes
2008
- The effect of carbon dioxide enrichment on apparent stem respiration from Pinus taeda L. is confounded by high levels of soil carbon dioxide
2008
- Constraining regional carbon fluxes in complex terrain: The Airborne Carbon in the Mountains Experiment 2007
2008
- Integration of process-based soil respiration models with whole-ecosystem CO2 measurements
2008
- Isoprene emission from terrestrial ecosystems in response to global change: Minding the gap between models and observations
2007
- COS 72-4: Data assimilation of eddy flux measurements coupled with an ecosystem process model to generate optimized predictions of carbon and water exchange in a high elevation coniferous forest
2007
- Annual basal area increment and growth duration of Pinus taeda in response to eight years of free-air carbon dioxide enrichment
2006
- Progressive nitrogen limitation of ecosystem processes under elevated CO2 in a warm-temperate forest
2006
- The Duke Forest FACE experiment: CO 2 enrichment of a loblolly pine forest
2006
- Special Feature--Progressive Nitrogen Limitation-Progressive nitrogen limitation of ecosystem processes under elevated CO2 in a warm-temperate forest
2006
- Contrasting responses of forest ecosystems to rising atmospheric CO sub 2 /sub : Implications for the global C cycle
2005
- Forest response to elevated CO2 is conserved across a broad range of productivity
2005
- Inter-annual variation in the response of Pinus taeda tree growth to long term Free Air Carbon dioxide Enrichment (FACE)
2005
- Contrasting responses of forest ecosystems to rising atmospheric CO<inf>2</inf>: Implications for the global C cycle
2005
- The changing role of forests in the global carbon cycle: responding to elevated carbon dioxide in the atmosphere
2005
- Contrasting responses of forest ecosystems to rising atmospheric CO2: implications for the global C cycle
2005
- Tree growth and carbon balance in a temperate forest exposed to elevated carbon dioxide for eight years
2005
- THE ONSET, CESSATION, AND RATE OF GROWTH OF LOBLOLLY PINES IN THE FACE EXPERIMENT
2004
- Climatic versus biotic constraints on carbon and water fluxes in seasonally drought-affected ponderosa pine ecosystems
2004
- Interannual Variation in the Response of Forest Productivity to Elevated Carbon Dioxide
2003
- A meta-analysis of elevated [CO<inf>2</inf>] effects on soybean (Glycine max) physiology, growth and yield
2002
- A meta-analysis of elevated [CO2] effects on soybean (glycine max) physiology, growth and yield
2002