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Increased CO2 Loss From Vegetated Drained Lake Tundra Ecosystems Due To Flooding

by Fianna O'Brien - January 25, 2017

Tundra ecosystems are especially sensitive to climate change, which is particularly rapid in high northern latitudes resulting in significant alterations in temperature and soil moisture. Numerous studies have demonstrated that… More

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Long-Term Variability In The Water Budget And Its Controls In An Oak-Dominated Temperate Forest

by Fianna O'Brien - January 25, 2017

Water availability is one of the key environmental factors that control ecosystem functions in temperate forests. Changing climate is likely to alter the ecohydrology and other ecosystem processes, which affect… More

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Modeling And Measuring The Effects Of Disturbance History And Climate On Carbon And Water Budgets In Evergreen Needleleaf Forests

by Fianna O'Brien - January 25, 2017

The effects of disturbance history, climate, and changes in atmospheric carbon dioxide (CO2) concentration and nitrogen deposition (Ndep) on carbon and water fluxes in seven North American evergreen forests are… More

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Potential Of MODIS Ocean Bands For Estimating CO2flux From Terrestrial Vegetation: A Novel Approach

by Fianna O'Brien - January 25, 2017

A physiologically-driven spectral index using two ocean-color bands of MODIS satellite sensor showed great potential to track seasonally changing photosynthetic light use efficiency (LUE) and stress-induced reduction in net primary… More

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Seasonal And Annual Respiration Of A Ponderosa Pine Ecosystem

by Fianna O'Brien - January 25, 2017

The net ecosystem exchange of CO2 between forests and the atmosphere, measured by eddy covariance, is the small difference between two large fluxes of photosynthesis and respiration. Chamber measurements of… More

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Landscape-Scale CO2 , H2O Vapour And Energy Flux Of Moist-Wet Coastal Tundra Ecosystems Over Two Growing Seasons

by Fianna O'Brien - January 25, 2017

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What The Towers Don'T See At Night: Nocturnal Sap Flow In Trees And Shrubs At Two Ameriflux Sites In California

by Fianna O'Brien - January 25, 2017

At the leaf scale, it is a long-held assumption that stomata close at night in the absence of light, causing transpiration to decrease to zero. Energy balance models and evapotranspiration… More

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Seasonal Variation In Radiative And Turbulent Exchange At A Deciduous Forest In Central Massachusetts

by Fianna O'Brien - January 25, 2017

Temperate deciduous forests exhibit dramatic seasonal changes in surface exchange properties following on the seasonal changes in leaf area index. Nearly continuous measurements of turbulent and radiative fluxes above and… More

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Mature Semiarid Chaparral Ecosystems Can Be A Significant Sink For Atmospheric Carbon Dioxide

by Fianna O'Brien - January 25, 2017

Carbon flux in arid and semiarid area shrublands, especially in old-growth shrub ecosystems, has been rarely studied using eddy covariance techniques. In this study, eddy covariance measurements over a 100-year… More

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Filtering Airborne Laser Scanning Data With Morphological Methods

by Fianna O'Brien - January 25, 2017

Filtering methods based on morphological operations have been developed in some previous studies. The biggest challenge for these methods is how to keep the terrain features unchanged while using large… More

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