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Estimating The Uncertainty In Annual Net Ecosystem Carbon Exchange: Spatial Variation In Turbulent Fluxes And Sampling Errors In Eddy-Covariance Measurements

by Fianna O'Brien - January 27, 2017

Above forest canopies, eddy covariance (EC) measurements of mass (CO2, H2O vapor) and energy exchange, assumed to represent ecosystem fluxes, are commonly made at one point in the roughness sublayer… More

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Transfer Conductance In Second Growth Douglas-Fir (Pseudotsuga Menziesii (Mirb.)Franco) Canopies

by Fianna O'Brien - January 27, 2017

The internal conductance from intercellular spaces to the sites of carboxylation (gi) has only been measured in a few tree species and not in conifers, despite the fact it may… More

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Modeling Seasonal To Annual Carbon Balance Of Mer Bleue Bog, Ontario, Canada

by Fianna O'Brien - January 27, 2017

Northern peatlands contain enormous quantities of organic carbon within a few meters of the atmosphere and play a significant role in the planetary carbon balance. We have developed a new,… More

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Climate Change And Fire Management In The Mid-Atlantic Region

by Fianna O'Brien - January 27, 2017

In this review, we summarize the potential impacts of climate change on wildfire activity in the mid-Atlantic region, and then consider how the beneficial uses of prescribed fire could conflict… More

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Eddy Covariance Measurements With A New Fast-Response, Enclosed-Path Analyzer: Spectral Characteristics And Cross-System Comparisons

by Fianna O'Brien - January 27, 2017

A new class of enclosed path gas analyzers suitable for eddy covariance applications combines the advantages of traditional closed-path systems (small density corrections, good performance in poor weather) and open-path… More

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Extensive Belowground Carbon Storage Supports Roots And Mycorrhizae In Regenerating Scrub Oaks

by Fianna O'Brien - January 27, 2017

Portions of a regenerating scrub oak ecosystem were enclosed in open-top chambers and exposed to elevated CO2. The distinct 13C signal of the supplemental CO2 was used to trace the… More

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Sensible Heat Flux Estimation By Flux Variance And Half-Order Time Derivative Methods

by Fianna O'Brien - January 27, 2017

This study is the first to contrast two similarity theory methods, the flux variance and the half-order time derivative, over a wide range of atmospheric stability and surface roughness conditions…. More

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Environmental And Vegetation Controls On The Spatial Variability Of CH4 Emission From Wet-Sedge And Tussock Tundra Ecosystems In The Arctic

by Fianna O'Brien - January 27, 2017

Aims Despite multiple studies investigating the environmental controls on CH4 fluxes from arctic tundra ecosystems, the high spatial variability of CH4 emissions is not fully understood. This makes the upscaling… More

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A Spectral Analysis Of Biosphere–Atmosphere Trace Gas Flux Densities And Meteorological Variables Across Hour To Multi-Year Time Scales

by Fianna O'Brien - January 27, 2017

The advent of long-term studies on CO2 and water vapor exchange provides us with new information on how the atmosphere and biosphere interact. Conventional time series analysis suggests that temporal… More

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Hydrologic Response To Precipitation Pulses Under And Between Shrubs In The Chihuahuan Desert, Arizona

by Fianna O'Brien - January 27, 2017

Observations of the temporal and spatial distribution of poststorm soil moisture in open shrublands and savannas are limited, yet they are critical to understanding the interaction and feedback between moisture… More

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