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
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 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
Assessments of carbon (C) fluxes in the Arctic require detailed data on both how and why these fluxes vary across the landscape. Such assessments are complicated because tundra vegetation has diverse structure and function at both local and regional scales. To investigate this diversity, the Arctic Flux Study has used the eddy covariance …
Journal: Global Change Biology, Volume 6 (S1): 116-126 (2000), ISBN . DOI: 10.1046/j.1365-2486.2000.06016.x Sites: US-Upa
Journal: Tree Physiology, Volume 20 (4): 265-270 (2000), ISBN . DOI: 10.1093/treephys/20.4.265 Sites: US-UMB
Net ecosystem productivity (NEP), net primary productivity (NPP), and water vapour exchange of a mature Pinus ponderosa forest (44°30′ N, 121°37′ W) growing …
Journal: Global Change Biology, Volume 6 (2): 155-168 (2000), ISBN . DOI: 10.1046/j.1365-2486.2000.00291.x Sites: US-Me4
We examined the effects of forest harvesting on the net exchange of methane (CH4) between the atmosphere and sandy soils in two mature slash pine (Pinus elliottii Engelm. var. elliottii) plantations in northern Florida. Before each of the stem-only harvests, soils in these plantations were net sinks for CH4 …
Journal: Canadian Journal Of Forest Research, Volume 30 (10): 1534-1542 (2000), ISBN . DOI: 10.1139/cjfr-30-10-1534 Sites: US-SP1, US-SP2, US-SP3, US-SP4
A bulk ABL similarity approach was used to make regional estimates of the sensible heat flux by combining surface temperature measurements with mixed layer temperature and wind speed profiles. The mixed layer profiles were measured by a 915 MHz Profiler/Radio Acoustic Sounding …
Journal: Advances In Water Resources, Volume 23 (4): 339-348 (2000), ISBN . DOI: 10.1016/s0309-1708(99)00028-7 Sites: US-Wlr
Results from the first full year of measurements (1998–1999) of above canopy CO2 and energy fluxes at the AmeriFlux site in the Morgan-Monroe State Forest, IN, USA, are presented. The site is located in an extensive secondary successional broadleaf forest in the maple-beech to oak-hickory transition zone. The …
Journal: Agricultural And Forest Meteorology, Volume 103 (4): 357-374 (2000), ISBN . DOI: 10.1016/s0168-1923(00)00140-4 Sites: US-MMS
Abandonment and reforestation of agricultural lands has been a major influence on the landscape of eastern North America. Cultivation and soil amendments can dramatically alter soil nutrient pools and cycling, yet few studies have examined the long-term (>50 yr) influence of pasturing and cultivation on soil processes in the forests …
Journal: Ecology, Volume 81 (8): 2314-2330 (2000), ISBN . DOI: 10.1890/0012-9658(2000)081[2314:ltioao]2.0.co;2 Sites: US-LPH