Publications

Publications Found: 1437

Net Ecosystem Production In A Temperate Pine Plantation In Southeastern Canada
Arain, M. A., Restrepo-Coupe, N.

Eddy covariance measurements of carbon dioxide (CO2) and water vapour fluxes were made from June 2002 to May 2003 over a 65-year-old temperate conifer plantation forest in southern Ontario, Canada. This site is part of a newly initiated long-term tower flux measurement …


Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 223-241 (2005). DOI: 10.1016/j.agrformet.2004.10.003 Sites: CA-Ca1, CA-TP1, CA-TP2, CA-TP3, CA-TP4, US-Dk3, US-GLE, US-Ho1, US-Me4, US-Me5, US-NR1

Midday Values Of Gross CO2 Flux And Light Use Efficiency During Satellite Overpasses Can Be Used To Directly Estimate Eight-Day Mean Flux
Sims, D. A., Rahman, A. F., Cordova, V. D., Baldocchi, D. D., Flanagan, L. B., Goldstein, A. H., Hollinger, D. Y., Misson, L., Monson, R. K., Schmid, H. P., Wofsy, S. C., Xu, L.

Most satellites provide, at best, a single daily snapshot of vegetation and, at worst, these snapshots may be separated by periods of many days when the ground was obscured by cloud cover. Since vegetation carbon exchange can be very dynamic on diurnal and day-to-day timescales, the limited temporal resolution of satellite data is …


Journal: Agricultural And Forest Meteorology, Volume 131 (1-2): 1-12 (2005). DOI: 10.1016/j.agrformet.2005.04.006 Sites: CA-Let, US-Blo, US-Ho1, US-MMS, US-NR1, US-Ton, US-Var

Changes In The Surface Energy Budget After Fire In Boreal Ecosystems Of Interior Alaska: An Annual Perspective
Liu, H., Randerson, J. T., Lindfors, J., Chapin, F. S.

Understanding links between the disturbance regime and regional climate in boreal regions requires observations of the surface energy budget from ecosystems in various stages of secondary succession. While several studies have characterized fire-induced differences in surface energy fluxes from boreal ecosystems during summer months, …


Journal: Journal Of Geophysical Research, Volume 110 (D13): n/a-n/a (2005). DOI: 10.1029/2004jd005158 Sites: US-Bn1, US-Bn2, US-Bn3

Assessing Bias In Evapotranspiration And Soil Moisture Estimates Due To The Use Of Modeled Solar Radiation And Dew Point Temperature Data
Mahmood, R., Hubbard, K. G.

Solar radiation and dew point temperature are important input variables for many crop growth ecological, hydrological, and meteorological models. It is also well known that solar radiation and dew point temperature (and relative humidity) data are not readily available for …


Journal: Agricultural And Forest Meteorology, Volume 130 (1-2): 71-84 (2005). DOI: 10.1016/j.agrformet.2005.02.004 Sites: US-Ne1, US-Ne2, US-Ne3

Statistical Modeling Of Ecosystem Respiration Using Eddy Covariance Data: Maximum Likelihood Parameter Estimation, And Monte Carlo Simulation Of Model And Parameter Uncertainty, Applied To Three Simple Models
Richardson, A. D., Hollinger, D. Y.

Whether the goal is to fill gaps in the flux record, or to extract physiological parameters from eddy covariance data, researchers are frequently interested in fitting simple models of ecosystem physiology to measured data. Presently, there is no consensus on the best models …


Journal: Agricultural And Forest Meteorology, Volume 131 (3-4): 191-208 (2005). DOI: 10.1016/j.agrformet.2005.05.008 Sites: US-Ho1, US-Ho2

Processing Of Yield Map Data
Ping, J. L., Dobermann, A.

Yield maps reflect systematic and random sources of yield variation as well as numerous errors caused by the harvest and mapping procedures used. A general framework for processing of multi-year yield map data was developed. Steps included (1) raw data screening, …


Journal: Precision Agriculture, Volume 6 (2): 193-212 (2005). DOI: 10.1007/s11119-005-1035-2 Sites: US-Ne1, US-Ne2, US-Ne3

A Comparison Of New Measurements Of Total Monoterpene Flux With Improved Measurements Of Speciated Monoterpene Flux
Lee, A., Schade, G. W., Holzinger, R., Goldstein, A. H.

Many monoterpenes have been identified in forest emissions using gas chromatography (GC). Until now, it has been impossible to determine whether all monoterpenes are appropriately measured using GC techniques. We used a proton transfer reaction mass spectrometer (PTR-MS) coupled with the eddy covariance (EC) technique to measure …


Journal: Atmospheric Chemistry And Physics, Volume 5 (2): 505-513 (2005). DOI: 10.5194/acp-5-505-2005 Sites: US-Blo

Net Primary Production And Canopy Nitrogen In A Temperate Forest Landscape: An Analysis Using Imaging Spectroscopy, Modeling And Field Data
Ollinger, S. V., Smith, M.

Understanding spatial patterns of net primary production (NPP) is central to the study of terrestrial ecosystems, but efforts are frequently hampered by a lack of spatial information regarding factors such as nitrogen availability and site history. Here, we examined the degree to which canopy nitrogen can serve as …


Journal: Ecosystems, Volume 8 (7): 760-778 (2005). DOI: 10.1007/s10021-005-0079-5 Sites: US-Bar

Effects Of Climate Variability On Carbon Sequestration Among Adjacent Wet Sedge Tundra And Moist Tussock Tundra Ecosystems
Kwon, H.J., Oechel, W.C., Zulueta, R.C., Hastings, S.J.

Temporal and spatial variability in the Arctic introduces considerable uncertainty in the estimation of the current carbon budget and Arctic ecosystem response to climate change. Few representative measurements are available for land-surface parameterization of the Arctic tundra in regional and global climate models. In this study, …


Journal: Journal Of Geophysical Research: Biogeosciences, Volume 111 (G3): 2005-2012 (2005). DOI: 10.1029/2005JG000036 Sites: US-Atq, US-Brw

Modeling Gross Primary Production Of An Evergreen Needleleaf Forest Using Modis And Climate Data
Xiao, X., Zhang, Q., Hollinger, D., Aber, J., Moore, B.

Forest canopies are composed of photosynthetically active vegetation (PAV, chloroplasts) and nonphotosynthetic vegetation (NPV, e.g., cell wall, vein, branch). The fraction of photosynthetically active radiation …


Journal: Ecological Applications, Volume 15 (3): 954-969 (2005). DOI: 10.1890/04-0470 Sites: US-Ho1, US-Ho2, US-Ho3