Publications

Publications Found: 1371
Spatiotemporal Measurement And Modeling Of Stand-Level Boreal Forest Soil Temperatures
Bond-Lamberty, B., Wang, C., Gower, S. T.

The spatial and temporal dynamics of soil temperature (TSOIL) strongly influence a wide range of biotic and abiotic processes in boreal forests. Relatively few spatial and temporal TSOIL measurements have been made in these systems; in addition, not all ecosystem models take into account the …


Journal: Agricultural And Forest Meteorology, Volume 131 (1-2): 27-40 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.04.008 Sites: CA-NS2, CA-NS3, CA-NS5, CA-NS6, CA-NS7

Modeling Soil CO2 Emissions From Ecosystems
Del Grosso, S., Parton, W., Mosier, A., Holland, E., Pendall, E., Schimel, D., Ojima, D.

We present a new soil respiration model, describe a formal model testing procedure, and compare our model with five alternative models using an extensive data set of observed soil respiration. Gas flux data from rangeland soils that included a large number of measurements at low temperatures were used to model soil CO2


Journal: Biogeochemistry, Volume 73 (1): 71-91 (2005), ISBN . DOI: 10.1007/s10533-004-0898-z Sites: US-GLE

Atmospheric Aerosol Light Scattering And Surface Wetness Influence The Diurnal Pattern Of Net Ecosystem Exchange In A Semi-Arid Ponderosa Pine Plantation
Misson, L., Lunden, M., McKay, M., Goldstein, A. H.

The diurnal variation of net ecosystem exchange (NEE) showed an unusual pattern at the Blodgett Forest Ameriflux site, with late afternoon NEE lower than early morning (indicating more uptake), while air temperature and atmospheric vapor pressure deficit were much higher. …


Journal: Agricultural And Forest Meteorology, Volume 129 (1-2): 69-83 (2005), ISBN . DOI: 10.1016/j.agrformet.2004.11.008 Sites: US-Blo

Modelling CO2 And Energy Exchanges In A Northern Semiarid Grassland Using The Carbon- And Nitrogen-Coupled Canadian Land Surface Scheme (C-CLASS)
Zhang, Y., Grant, R., Flanagan, L., Wang, S., Verseghy, D.

The development of carbon (C) and nitrogen (N) simulations is one of the ongoing efforts in the land surface schemes of climate models. The C- and N-coupled Canadian Land Surface Scheme (C-CLASS) was recently modified to better represent grassland ecosystems. Improvements include revised plant growth and senescence calculations that …


Journal: Ecological Modelling, Volume 181 (4): 591-614 (2005), ISBN . DOI: 10.1016/j.ecolmodel.2004.07.007 Sites: CA-Let

Objective Threshold Determination For Nighttime Eddy Flux Filtering
Gu, L., Falge, E. M., Boden, T., Baldocchi, D. D., Black, T., Saleska, S. R., Suni, T., Verma, S. B., Vesala, T., Wofsy, S. C., Xu, L.

We recommend an automated statistical method (Moving Point Test, or MPT) to determine the friction velocity (u*) thresholds in nighttime eddy flux filtering. Our intention is to make the determination of the u* thresholds objective and reproducible and to keep flux treatment consistent over …


Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 179-197 (2005), ISBN . DOI: 10.1016/j.agrformet.2004.11.006 Sites: BR-Sa1, CA-Oas, US-Shd, US-Ton, US-Var

Examining Strategies To Improve The Carbon Balance Of Corn/Soybean Agriculture Using Eddy Covariance And Mass Balance Techniques
Baker, J., Griffis, T.

There is much interest in the role that agricultural practices might play in sequestering carbon to help offset rising atmospheric CO2 concentrations. A number of management methods that might increase soil C levels have been suggested, but there are scant available data to properly support recommendations or policy changes. …


Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 163-177 (2005), ISBN . DOI: 10.1016/j.agrformet.2004.11.005 Sites: US-Ro1

Annual Carbon Dioxide Exchange In Irrigated And Rainfed Maize-Based Agroecosystems
Verma, S. B., Dobermann, A., Cassman, K. G., Walters, D. T., Knops, J. M., Arkebauer, T. J., Suyker, A. E., Burba, G. G., Amos, B., Yang, H., Ginting, D., Hubbard, K. G., Gitelson, A. A., Walter-Shea, E. A.

Carbon dioxide exchange was quantified in maize–soybean agroecosystems employing year-round tower eddy covariance flux systems and measurements of soil C stocks, CO2fluxes from the soil surface, plant biomass, and litter decomposition. Measurements were made in three cropping systems: (a) irrigated continuous maize, …


Journal: Agricultural And Forest Meteorology, Volume 131 (1-2): 77-96 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.05.003 Sites: US-Ne1, US-Ne2, US-Ne3

Gross Primary Production And Ecosystem Respiration Of Irrigated Maize And Irrigated Soybean During A Growing Season
Suyker, A. E., Verma, S. B., Burba, G. G., Arkebauer, T. J.

Using eddy covariance flux measurements, gross primary production (GPP) and ecosystem respiration (Re) of irrigated maize and soybean fields were quantified and examined in terms of relevant controlling variables. Even though the peak green leaf area index (GLAI) of the maize and soybean canopies was comparable …


Journal: Agricultural And Forest Meteorology, Volume 131 (3-4): 180-190 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.05.007 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), ISBN . DOI: 10.1016/j.agrformet.2005.05.008 Sites: US-Ho1, US-Ho2

Site-Level Evaluation Of Satellite-Based Global Terrestrial Gross Primary Production And Net Primary Production Monitoring
Turner, D. P., Ritts, W. D., Cohen, W. B., Maeirsperger, T. K., Gower, S. T., Kirschbaum, A. A., Running, S. W., Zhao, M., Wofsy, S. C., Dunn, A. L., Law, B. E., Campbell, J. L., Oechel, W. C., Kwon, H. J., Meyers, T. P., Small, E. E., Kurc, S. A., Gamon, J. A.

Operational monitoring of global terrestrial gross primary production (GPP) and net primary production (NPP) is now underway using imagery from the satellite-borne Moderate Resolution Imaging Spectroradiometer (MODIS) sensor. Evaluation of MODIS GPP and NPP products will require site-level studies across a range of biomes, with close …


Journal: Global Change Biology, Volume 11 (4): 666-684 (2005), ISBN . DOI: 10.1111/j.1365-2486.2005.00936.x Sites: US-Me4, US-Me5