A5088982104- Plant Water Relations and Carbon Dynamics
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Wind and Air Flow Studies
- Fluid Dynamics and Turbulent Flows
- Cryospheric studies and observations
- Climate variability and models
- Fire effects on ecosystems
- Tree-ring climate responses
- Atmospheric aerosols and clouds
- Plant responses to elevated CO2
- Air Quality and Health Impacts
- Hydrology and Watershed Management Studies
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Urban Heat Island Mitigation
- Remote Sensing in Agriculture
- CO2 Sequestration and Geologic Interactions
- Climate Change Policy and Economics
- Geochemistry and Geologic Mapping
- Rangeland and Wildlife Management
- Building Energy and Comfort Optimization
- Hydrology and Drought Analysis
- Bioenergy crop production and management
- Environmental Impact and Sustainability
University of New Hampshire
2024
US Forest Service
2024
Triangle
2024
University of Georgia
2010-2023
University of Utah
2015-2021
National Institute for Space Research
2021
Universidade Federal do Paraná
2006-2007
Instituto Agronômico do Paraná
2006
Abstract. Droughts in the western United States are expected to intensify with climate change. Thus, an adequate representation of ecosystem response water stress land models is critical for predicting carbon dynamics. The goal this study was evaluate performance Community Land Model (CLM) version 4.5 against observations at old-growth coniferous forest site Pacific Northwest region (Wind River AmeriFlux site), characterized by a Mediterranean that subjects trees each summer. CLM driven...
Abstract. Land surface models are useful tools to quantify contemporary and future climate impact on terrestrial carbon cycle processes, provided they can be appropriately constrained tested with observations. Stable isotopes of CO2 offer the potential improve model representation coupled water cycles because strongly influenced by stomatal function. Recently, a stable isotope discrimination was incorporated into Community Model component Earth System Model. Here, we model's capability...
Abstract Traditional methods of carbon monitoring in mountainous regions are challenged by complex terrain. Recently, solar‐induced fluorescence (SIF) has been found to be an indicator gross primary production (GPP), and the increased availability remotely sensed SIF provides opportunity estimate GPP across Western United States. Although empirical linkage between is strong, current mechanistic understanding this incomplete depends upon changes leaf biochemical processes which absorbed...
Abstract. When estimating fossil fuel carbon dioxide (FFCO2) emissions from observed CO2 concentrations, the accuracy can be hampered by biogenic exchanges during growing season, even for urban areas where strong are found. While fluxes have been studied extensively across natural vegetation types, within an area challenging to quantify due limited observations and differences between rural regions. Here we developed a simple model representation, i.e., Solar-Induced Fluorescence (SIF)...
Abstract The Western United States is dominated by natural lands that play a critical role for carbon balance, water quality, and timber reserves. This region also particularly vulnerable to forest mortality from drought, insect attack, wildfires, thus requiring constant monitoring assess ecosystem health. Carbon techniques are challenged the complex mountainous terrain, there an opportunity data assimilation systems combine land surface models satellite‐derived observations provide improved...
Abstract. Summer droughts in the western United States are expected to intensify with climate change. Thus, an adequate representation of ecosystem drought response land models is critical for predicting carbon dynamics. The goal this study was assess performance Community Land Model, Version 4.5 (CLM) old-growth coniferous forest Pacific Northwest region (Wind River AmeriFlux site), characterized by a that has heavy winter precipitation followed summer drought. Particular attention given...
Abstract. The interpretation of flux measurements in nocturnal conditions is typically fraught with challenges. This paper reports on how the presence wave-like disturbances a time series, can lead to an overestimation turbulence statistics, errors when calculating stability parameter, erroneous estimation friction velocity u* used screen data, and turbulent calculations. Using series pressure signal from microbarograph, at AmeriFlux site are identified. removed during calculation statistics...
Abstract A field project over the Atmospheric Radiation Measurement–Cloud and Test Bed (ARM–CART) site during a period of several nights in September 2007 was conducted to explore evolution low-level jet (LLJ). Data were collected from situ (a multilevel tower) remote (sodar) sensors, observed LLJ activity found agree well with data earlier studies regarding speed, height, direction. To study nocturnal boundary layer (NBL) behavior, Regional Modeling System used simulate ARM–CART NBL...
An attenuated eddy covariance (AEC) method is proposed, combining the use of a relatively robust three‐dimensional sonic anemometer and ventilated capacitive hygrometer‐thermometer (CHT). The CHT able to resolve large enough frequency region water vapor density turbulent fluctuations allow corrections for its limited time response in inertial subrange vertical velocity‐humidity cospectrum. This approach often called “band‐pass method.” In present work we propose technique which between...
Abstract. Sodar (SOund Detection And Ranging), eddy-covariance, and tower profile measurements of wind speed carbon dioxide were performed during 17 consecutive nights in complex terrain northern Taiwan. The scope the study was to identify causes for intermittent turbulence events analyze their importance nocturnal atmosphere–biosphere exchange as quantified with eddy-covariance measurements. If intermittency occurs frequently at a measurement site, then this process needs be order achieve...
Abstract. Land surface models are useful tools to quantify contemporary and future climate impact on terrestrial carbon cycle processes, provided they can be appropriately constrained tested with observations. Stable isotopes of CO2 offer the potential improve model representation coupled water cycles because strongly influenced by stomatal function. Recently, a stable isotope discrimination was incorporated into Community Model component Earth System Model. Here, we model's capability...
Abstract Fire plays an essential role in maintaining the structure and function of longleaf pine ecosystems. While effects fire on carbon cycle have been measured previous studies for short periods during a burn multiyear following burn, information how is influenced by such changes over span few weeks to months has yet be quantified. We analyzed high‐frequency measurements CO 2 concentration flux, as well associated micrometeorological variables, at three levels tall Aiken AmeriFlux tower...
The Western US accounts for a significant amount of the forested biomass and carbon uptake within conterminous United States. Warming drying climate trends combined with legacy fire suppression have left forests particularly vulnerable to disturbance from insects, drought mortality. These challenging conditions may significantly weaken this region’s ability atmosphere warrant continued monitoring. Traditional methods monitoring are limited by complex terrain Rocky Mountains that lead...