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Temporal Dynamics Of Aerodynamic Canopy Height Derived From Eddy Covariance Momentum Flux Data Across North American Flux Networks

by Housen Chu - October 4, 2018

Aerodynamic canopy height (ha) is the effective height of vegetation canopy for its influence on atmospheric fluxes and is a key parameter of surface‐atmosphere coupling. However, methods to estimate ha… More

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Does day and night sampling reduce spurious correlation between canopy photosynthesis and ecosystem respiration?

by Dennis Baldocchi - February 28, 2017

It is necessary to partition eddy covariance measurements of carbon dioxide exchange into its offsetting gross fluxes, canopy photosynthesis, and ecosystem respiration, to understand the biophysical controls on the net… More

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Sap Flow In Trembling Aspen: Implications For Stomatal Responses To Vapor Pressure Deficit

by Fianna O'Brien - January 31, 2017

We monitored sap flow and estimated diurnal changes in transpiration rates of two trembling aspen (Populus tremuloides Michx.) stands, located in the southern boreal forest and aspen parkland of Saskatchewan,… More

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Similarity Theory For Local And Spatially Averaged Momentum Fluxes

by Fianna O'Brien - January 31, 2017

Tower and aircraft data from a number of field studies are analyzed to: (1) estimate the roughness lengths for local and area-averaged momentum fluxes over various surface types; (2) examine… 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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Vertical Gradients In Photosynthetic Gas Exchange Characteristics And Refixation Of Respired CO2 Within Boreal Forest Canopies

by Fianna O'Brien - January 31, 2017

We compared vertical gradients in leaf gas exchange, CO2 concentrations, and refixation of respired CO2 in stands of Populus tremuloides Michx., Pinus banksiana Lamb. and Picea mariana (Mill.) B.S.P. at… More

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Seasonal Variation And Partitioning Of Ecosystem Respiration In A Southern Boreal Aspen Forest

by Fianna O'Brien - January 31, 2017

Continuous automatic chamber and eddy covariance (EC) measurements were made at an old aspen forest (SOA) located at southern boreal treeline in Saskatchewan, Canada to examine the temporal variability in… More

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A Physiological Basis For Biosphere-Atmosphere Interactions In The Boreal Forest: An Overview

by Fianna O'Brien - January 31, 2017

Interdisciplinary field experiments for global change research are large, intensive efforts that study the controls on fluxes of carbon, water, trace gases, and energy between terrestrial ecosystems and the atmosphere… More

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Diurnal And Annual Exchanges Of Mass And Energy Between An Aspen-Hazelnut Forest And The Atmosphere: Testing The Mathematical Model Ecosys With Data From The BOREAS Experiment

by Fianna O'Brien - January 31, 2017

There is much uncertainty about the net carbon (C) exchange of boreal forest ecosystems, although this exchange may be an important part of global C dynamics. To resolve this uncertainty,… More

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Growth And Maintenance Respiration Rates Of Aspen, Black Spruce And Jack Pine Stems At Northern And Southern BOREAS Sites

by Fianna O'Brien - January 31, 2017

We measured stem respiration rates during and after the 1994 growing season of three common boreal tree species at sites near the northern and southern boundaries of the closed-canopy boreal… More

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