Publications

Publications Found: 1378

Comparing Independent Estimates Of Carbon Dioxide Exchange Over 5 Years At A Deciduous Forest In The Southeastern United States
Wilson, K. B., Baldocchi, D. D.

At a deciduous forest in the southeast United States (Walker Branch Watershed, Oak Ridge, Tennessee), as at other sites with tall vegetation and/or complex terrain, it is difficult to temporally integrate …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 106 (D24): 34167-34178 (2001), ISBN . DOI: 10.1029/2001jd000624 Sites: US-WBW

Similarity Theory For Local And Spatially Averaged Momentum Fluxes
Nakamura, R., Mahrt, L.

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 the applicability of the ψ-stability formulations of Paulson and Dyer for momentum fluxes; (3) investigate the possibility …


Journal: Agricultural And Forest Meteorology, Volume 108 (4): 265-279 (2001), ISBN . DOI: 10.1016/s0168-1923(01)00250-7 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp, CA-SJ3

Test Of An Extended Mathematical Approach To Calculate Maize Leaf Area Index And Leaf Angle Distribution
Antunes, M. A. H., Walter-Shea, E. A., Mesarch, M. A.

Accurate estimates of leaf area index (LAI) and leaf angle distribution (LAD) are important for estimating the exchange of energy and gases in vegetative canopies. Direct estimates of LAI and LAD are laborious, time consuming and often times destructive. Stewart and Dwyer [Agric. For. Meteorol. 66 (1993) 247] introduced a mathematical …


Journal: Agricultural And Forest Meteorology, Volume 108 (1): 45-53 (2001), ISBN . DOI: 10.1016/s0168-1923(01)00219-2 Sites: US-KFB, US-Kon

Annual Cycle Of CO2 Exchange At A Bog Peatland
Lafleur, P. M., Roulet, N. T., Admiral, S. W.

Eddy covariance measurements of the carbon dioxide flux from an ombrotrophic bog near Ottawa, Canada, were made between June 1, 1998, and May 31, 1999. Net ecosystem exchange of CO2 (NEE) showed …


Journal: Journal Of Geophysical Research: Atmospheres, Volume 106 (D3): 3071-3081 (2001), ISBN . DOI: 10.1029/2000jd900588 Sites: CA-Mer

Factors Controlling Evaporation And Energy Partitioning Beneath A Deciduous Forest Over An Annual Cycle
Wilson, K. B., Hanson, P. J., Baldocchi, D. D.

The energy balance components were measured above the ground surface of a temperate deciduous forest over an annual cycle using the eddy covariance technique. Over a year, the net radiation at the forest floor was 21.5% of that above the canopy, but this proportion was not constant, primarily because of the distinct phenological …


Journal: Agricultural And Forest Meteorology, Volume 102 (2-3): 83-103 (2000), ISBN . DOI: 10.1016/s0168-1923(00)00124-6 Sites: US-WBW

Nocturnal Mixing In A Forest Subcanopy
Mahrt, L., Lee, X., Black, A., Neumann, H., Staebler, R.

The vertical structure of the flow in the old aspen canopy in BOREAS is examined in terms of thermocouple profiles and sonic anemometers above, within, and below the aspen canopy. The data are composited for different periods in order to isolate seasonal changes of the canopy and sun angle. On clear nights, a strong surface …


Journal: Agricultural And Forest Meteorology, Volume 101 (1): 67-78 (2000), ISBN . DOI: 10.1016/s0168-1923(99)00161-6 Sites: CA-Oas

Seasonal And Interannual Variability Of Energy Fluxes Over A Broadleaved Temperate Deciduous Forest In North America
Wilson, K. B., Baldocchi, D. D.

The components of the surface energy balance were measured for 3 years over a broadleaved deciduous forest using the eddy covariance technique. Within years, the magnitude and distribution of fluxes was controlled by seasonal changes in solar radiation, drought, as well as leaf emergence and senescence. Evapotranspiration increased …


Journal: Agricultural And Forest Meteorology, Volume 100 (1): 1-18 (2000), ISBN . DOI: 10.1016/s0168-1923(99)00088-x Sites: US-WBW

Wintertime Ozone Fluxes And Profiles Above A Subalpine Spruce–Fir Forest
Zeller, K.

High rural concentrations of ozone (O3) are thought to be stratospheric in origin, advected from upwind urban sources, or photochemically generated locally by natural trace gas emissions. Ozone is known to be transported vertically downward from the above-canopy atmospheric surface layer and destroyed within stomata or …


Journal: Journal Of Applied Meteorology, Volume 39 (1): 92-101 (2000), ISBN . DOI: 10.1175/1520-0450(2000)039<0092:WOFAPA>2.0.CO;2 Sites: US-GBT

Land–Atmosphere Interaction Research, Early Results, And Opportunities In The Walnut River Watershed In Southeast Kansas: CASES And ABLE
LeMone, M. A., Grossman, R. L., Coulter, R. L., Wesley, M. L., Klazura, G. E., Poulos, G. S., Blumen, W., Lundquist, J. K., Cuenca, R. H., Kelly, S. F., Brandes, E. A., Oncley, S. P., McMillen, R. T., Hicks, B. B.

This paper describes the development of the Cooperative Atmosphere Surface Exchange Study (CASES), its synergism with the development of the Atmosphere Boundary Layer Experiments (ABLE) and related efforts, CASES field programs, some early results, and future plans and opportunities. CASES is a grassroots multidisciplinary effort …


Journal: Bulletin Of The American Meteorological Society, Volume 81 (4): 757-779 (2000), ISBN . DOI: 10.1175/1520-0477(2000)081<0757:LIRERA>2.3.CO;2 Sites: US-Wlr

The Dynamic Role Of Root-Water Uptake In Coupling Potential To Actual Transpiration
Lai, C., Katul, G.

The relationship between actual (Eact) and potential (Ep) transpiration above a grass-covered forest clearing was investigated numerically and experimentally from simultaneous measurements of soil moisture content profiles, mean meteorological …


Journal: Advances In Water Resources, Volume 23 (4): 427-439 (2000), ISBN . DOI: 10.1016/s0309-1708(99)00023-8 Sites: US-Dk3