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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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Carbon Exchange And Venting Anomalies In An Upland Deciduous Forest In Northern Wisconsin, USA

by Fianna O'Brien - January 31, 2017

Turbulent fluxes of carbon, water vapor, and temperature were continuously measured above an upland forest in north central Wisconsin during 1999 and 2000 using the eddy covariance method. Maple (Acer… More

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Ecosystem Carbon Dioxide Fluxes After Disturbance In Forests Of North America

by Fianna O'Brien - January 31, 2017

Disturbances are important for renewal of North American forests. Here we summarize more than 180 site years of eddy covariance measurements of carbon dioxide flux made at forest chronosequences in… More

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Oxygen Isotope Composition Of Evapotranspiration And Its Relation To C4 Photosynthetic Discrimination

by Fianna O'Brien - January 31, 2017

The oxygen isotope of water (18O-H2O) and carbon dioxide (18O-CO2) is an important signal of global change and can provide constraints on the coupled carbon-water cycle. Here, simultaneous observations of… More

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On Measuring And Modeling Energy Fluxes Above The Floor Of A Homogeneous And Heterogeneous Conifer Forest

by Fianna O'Brien - January 31, 2017

Information on mass and energy exchange at the soil surface under vegetation is a critical component of micrometeorological, climate, biogeochemical and hydrological models. Under sparse boreal and western conifer forests… More

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Observations Of Total Alkyl Nitrates Within The Sacramento Urban Plume

by Fianna O'Brien - January 31, 2017

During the summer of 2001, NO2, total peroxy nitrates (ΣPNs), total alkyl nitrates (ΣANs), HNO3, volatile organic compounds (VOC), CO2, O3, and meteorological variables were measured at Granite Bay, CA…. More

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