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Simulated Variations In Atmospheric CO2 Over A Wisconsin Forest Using A Coupled Ecosystem-Atmosphere Model

by Fianna O'Brien - January 31, 2017

Ecosystem fluxes of energy, water, and CO2 result in spatial and temporal variations in atmospheric properties. In principle, these variations can be used to quantify the fluxes through inverse modelling… More

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Remote Sensing Of Photosynthetic-Light-Use Efficiency Of Boreal Forest

by Fianna O'Brien - January 31, 2017

Using a helicopter-mounted portable spectroradiometer and continuous eddy covariance data we were able to evaluate the photochemical reflectance index (PRI) as an indicator of canopy photosynthetic light-use efficiency (LUE) in… More

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Ozone Deposition Onto A Deciduous Forest During Dry And Wet Conditions

by Fianna O'Brien - January 31, 2017

Results of an experiment conducted to quantify the ozone deposition onto a deciduous forest stand in an acid-precipitation-impacted area of Canada are presented and discussed. The ozone deposition data were… More

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Land Surface Heterogeneity In The Cooperative Atmosphere Surface Exchange Study (CASE-97). Part I: Comparing Modeled Surface Flux Maps With Surface-Flux Tower And Aircraft Measurements

by Fianna O'Brien - January 31, 2017

Land surface heterogeneity over an area of 71 km × 74 km in the lower Walnut River watershed, Kansas, was investigated using models and measurements from the 1997 Cooperative Atmosphere… More

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Climate Impact On Net Ecosystem Productivity Of A Semi-Arid Natural Grassland: Modeling And Measurement

by Fianna O'Brien - January 31, 2017

Models used to estimate net ecosystem productivity (NEP) during climate change should first be shown to simulate the effects on NEP of interannual variability in current climates. Energy and CO2… More

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A Spectral And Lag-Correlation Analysis Of Turbulence In A Deciduous Forest Canopy

by Fianna O'Brien - January 31, 2017

The processes influencing turbulence in a deciduous forest and the relevant length and time scales are investigated with spectral and cross-correlation analysis. Wind velocity power spectra were computed from three-dimensional… More

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Incorporating Spatial Heterogeneity Created By Permafrost Thaw Into A Landscape Carbon Estimate

by Fianna O'Brien - January 31, 2017

The future carbon balance of high-latitude ecosystems is dependent on the sensitivity of biological processes (photosynthesis and respiration) to the physical changes occurring with permafrost thaw. Predicting C exchange in… More

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The Potential Of Carbonyl Sulfide As A Proxy For Gross Primary Production At Flux Tower Sites

by Fianna O'Brien - January 31, 2017

Seasonal dynamics of atmospheric carbonyl sulfide (OCS) at regional and continental scales and plant OCS exchange at the leaf level have shown a close relationship with those for CO2. CO2… More

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The Effect Of Post-Fire Stand Age On The Boreal Forest Energy Balance

by Fianna O'Brien - January 31, 2017

Fire in the boreal forest renews forest stands and changes the ecosystem properties. The successional stage of the vegetation determines the radiative budget, energy balance partitioning, evapotranspiration and carbon dioxide… More

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Modelling Assimilation And Intercellular CO2 From Measured Conductance: A Synthesis Of Approaches

by Fianna O'Brien - January 31, 2017

A spectrum of models that estimate assimilation rate A from intercellular carbon dioxide concentration (Ci) and measured stomatal conductance to CO2 (gc) were investigated using leaf-level gas exchange measurements. The… More

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