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
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
The thermal environment of clear-cut, partially cut, and uncut forest sites in northern Wisconsin are examined for a warm year and a cool year. Temperatures at 0.5 m above and 0.05 m below ground, as well as base 5°C heat sums are computed for each site between May and …
Journal: Agricultural And Forest Meteorology, Volume 106 (4): 331-336 (2001), ISBN . DOI: 10.1016/s0168-1923(00)00220-3 Sites: US-WCr
Methodology for determining fluxes of CO2 and H2O vapor with the eddy-covariance method using data from instruments on a 447-m tower in the forest of northern Wisconsin is addressed. The primary goal of this study is the validation of the methods used to determine the net ecosystem exchange of CO2. …
Journal: Journal Of Atmospheric And Oceanic Technology, Volume 18 (4): 529-542 (2001), ISBN . DOI: 10.1175/1520-0426(2001)018<0529:LTCDFF>2.0.CO;2 Sites: US-PFa
We compared carbon storage and fluxes in young and old ponderosa pine stands in Oregon, including plant and soil storage, net primary productivity, respiration fluxes, eddy …
Journal: Global Change Biology, Volume 7 (7): 755-777 (2001), ISBN . DOI: 10.1046/j.1354-1013.2001.00439.x Sites: US-Me4, US-Me5
Measurements of CO2 exchange at the forest floor were made in shady dry areas dominated by feather mosses and open wet areas dominated by Sphagnum mosses within a 120-year-old black spruce forest in central Saskatchewan during 1996. Our objective was to study the environmental regulation of moss photosynthesis …
Journal: Agricultural And Forest Meteorology, Volume 108 (3): 165-181 (2001), ISBN . DOI: 10.1016/s0168-1923(01)00243-x Sites: CA-Obs
Journal: Tree Physiology, Volume 21 (6): 345-358 (2001), ISBN . DOI: 10.1093/treephys/21.6.345 Sites: US-WBW
Leaf area and its spatial distribution are key canopy parameters needed to model the radiation regime within a forest and to compute the mass and energy exchange between a forest and the atmosphere. A much larger proportion of available net radiation is received at the forest floor in open-canopy forests than in closed-canopy forests. …
Journal: Tree Physiology, Volume 21 (12-13): 777-787 (2001), ISBN . DOI: 10.1093/treephys/21.12-13.777 Sites: US-Me4
Leaf area and its spatial distribution are key parameters in describing canopy characteristics. They determine radiation regimes and influence mass and energy exchange with the atmosphere. The evaluation of leaf area in conifer stands is particularly challenging due to their open nature and clumping on the needle, shoot and tree …
Journal: Agricultural And Forest Meteorology, Volume 108 (1): 1-14 (2001), ISBN . DOI: 10.1016/s0168-1923(01)00226-x Sites: US-Me4
Measurements of chemical, physical, and optical properties of ambient aerosol particles were obtained at Bondville, Illinois. This research was completed to increase the spatial and temporal resolution of measured aerosol. Results from measurements describe (1) the physical and chemical characteristics of the aerosol and (2) the …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 106 (D3): 3019-3032 (2001), ISBN . DOI: 10.1029/2000jd900126 Sites: US-Bo1