Publications

Publications Found: 1378

Year-Round Observations Of The Net Ecosystem Exchange Of Carbon Dioxide In A Native Tallgrass Prairie
Suyker, A. E., Verma, S. B.

An Ameriflux site was established in mid 1996 to study the exchange of CO2 in a native tallgrass prairie of north-central Oklahoma, USA. Approximately the first 20 months of measurements (using eddy covariance) are described here. This prairie, dominated by warm season C4 grasses, is typical of the central Kansas/northern …


Journal: Global Change Biology, Volume 7 (3): 279-289 (2001), ISBN . DOI: 10.1046/j.1365-2486.2001.00407.x Sites: US-Shd

Modeling CO2 And Water Vapor Exchange Of A Temperate Broadleaved Forest Across Hourly To Decadal Time Scales
Baldocchi, D. D., Wilson, K. B.

Fluxes of carbon dioxide, water and energy between a temperate deciduous forest and the atmosphere were quantified across time scales of hours, days, seasons, years and decades. This exercise was performed using stand-level eddy covariance flux measurements and a biophysical model, CANOAK. The CANOAK model was tested with measurements …


Journal: Ecological Modelling, Volume 142 (1-2): 155-184 (2001), ISBN . DOI: 10.1016/s0304-3800(01)00287-3 Sites: US-WBW

A Comparison Of Summertime Water And CO2 Fluxes Over Rangeland For Well Watered And Drought Conditions
Meyers, T. P.

Continuous measurements of the surface energy balance components (net radiation Rn, sensible heat flux H, latent heat flux LE, ground heat flux G, and CO2 fluxes began in early June of 1995 at the Little Washita Watershed, near Chickasha, Oklahoma. A severe drought during …


Journal: Agricultural And Forest Meteorology, Volume 106 (3): 205-214 (2001), ISBN . DOI: 10.1016/s0168-1923(00)00213-6 Sites: US-LWW

Boundary Layer Clouds And Vegetation–Atmosphere Feedbacks
Freedman, J. M., Fitzjarrald, D. R., Moore, K. E., Sakai, R. K.

An analysis of boundary layer cumulus clouds and their impact on land surface–atmosphere exchange is presented. Seasonal trends indicate that in response to increasing insolation and sensible heat flux, both the mixed-layer height (zi) …


Journal: Journal Of Climate, Volume 14 (2): 180-197 (2001), ISBN . DOI: 10.1175/1520-0442(2001)013<0180:BLCAVA>2.0.CO;2 Sites: US-Ha1

Spatial And Temporal Variation In Respiration In A Young Ponderosa Pine Forest During A Summer Drought
Law, B., Kelliher, F., Baldocchi, D., Anthoni, P., Irvine, J., Moore, D., Van Tuyl, S.

Respiration rates of heterogeneous forest canopies arise from needles, stems, roots and soil microbes. To assess the temporal and spatial variation in respiration rates of these components in a heterogeneous ponderosa pine forest canopy, and the processes that control these fluxes, we conducted an intensive field study during …


Journal: Agricultural And Forest Meteorology, Volume 110 (1): 27-43 (2001), ISBN . DOI: 10.1016/s0168-1923(01)00279-9 Sites: US-Me5

Carbon Dioxide And Water Vapor Exchange By Young And Old Ponderosa Pine Ecosystems During A Dry Summer
Law, B. E., Goldstein, A. H., Anthoni, P. M., Unsworth, M. H., Panek, J. A., Bauer, M. R., Fracheboud, J. M., Hultman, N.

We investigated key factors controlling mass and energy exchange by a young (6-year-old) ponderosa pine (Pinus ponderosa Laws.) plantation on the west side of the Sierra Nevada Mountains and an old-growth ponderosa pine forest (mix of 45- and 250-year-old trees) on the east side of the Cascade Mountains, from June through …


Journal: Tree Physiology, Volume 21 (5): 299-308 (2001), ISBN . DOI: 10.1093/treephys/21.5.299 Sites: US-Me4, US-Me5

Long-Term Observations Of The Dynamics Of The Continental Planetary Boundary Layer
Yi, C., Davis, K. J., Berger, B. W., Bakwin, P. S.

Time series of mixed layer depth, zi, and stable boundary layer height from March through October of 1998 are derived from a 915-MHz boundary layer profiling radar and CO2 mixing ratio measured from a 447-m tower in northern Wisconsin. Mixed layer depths from the profiler are in good agreement with radiosonde …


Journal: Journal Of The Atmospheric Sciences, Volume 58 (10): 1288-1299 (2001), ISBN . DOI: 10.1175/1520-0469(2001)058<1288:LTOOTD>2.0.CO;2 Sites: US-PFa

Fluxes Of Oxygenated Volatile Organic Compounds From A Ponderosa Pine Plantation
Schade, G. W., Goldstein, A. H.

We present the first canopy-scale, continuous, long-term flux measurements of a suite of oxygenated volatile organic compounds (OVOCs). Fluxes were measured above a ponderosa pine plantation, adjacent to …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 106 (D3): 3111-3123 (2001), ISBN . DOI: 10.1029/2000jd900592 Sites: US-Blo

A Spectral Analysis Of Biosphere–Atmosphere Trace Gas Flux Densities And Meteorological Variables Across Hour To Multi-Year Time Scales
Baldocchi, D., Falge, E., Wilson, K.

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 fluctuations of weather variables and mass and energy flux densities occur on numerous time scales. The time scales …


Journal: Agricultural And Forest Meteorology, Volume 107 (1): 1-27 (2001), ISBN . DOI: 10.1016/s0168-1923(00)00228-8 Sites: US-WBW

Sensible Heat Flux Estimation By Flux Variance And Half-Order Time Derivative Methods
Wesson, K. H., Katul, G., Lai, C.

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. These …


Journal: Water Resources Research, Volume 37 (9): 2333-2343 (2001), ISBN . DOI: 10.1029/2001wr900021 Sites: US-Dk3