Journal: Tree Physiology, Volume 22 (15-16): 1079-1092 (2002), ISBN . DOI: 10.1093/treephys/22.15-16.1079 Sites: US-Ha2
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 the Blodgett Forest Research Station (38°53′42.9″N, 120°37′57.9″W, 1315 m elevation), with a fully automated relaxed …
Journal: Journal of Geophysical Research-Atmospheres, Volume 106 (D3): 3111-3123 (2001), ISBN . DOI: 1029/2000JD900592 Sites: US-Blo
Soil respiration is an important component of the annual carbon balance of forests, but few studies have addressed interannual variation in soil respiration. The objectives of this study were to investigate the seasonal and interannual variation in soil respiration, temperature, precipitation, and soil water content in two New England …
Journal: Global Biogeochemical Cycles, Volume 15 (2): 337-350 (2001), ISBN . DOI: 10.1029/1999gb001248 Sites: US-Ha1, US-Ho1
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
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
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
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
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
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
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