Soil temperature and moisture influence soil respiration at a range of temporal and spatial scales. Although soil temperature and moisture may be seasonally correlated, intra and inter-annual variations in soil moisture do occur. There are few direct observations …
Journal: Biogeochemistry, Volume 73 (1): 149-182 (2005). DOI: 10.1007/s10533-004-5166-8 Sites: US-WCr
Forest canopies are composed of photosynthetically active vegetation (PAV, chloroplasts) and nonphotosynthetic vegetation (NPV, e.g., cell wall, vein, branch). The fraction of photosynthetically active radiation …
Journal: Ecological Applications, Volume 15 (3): 954-969 (2005). DOI: 10.1890/04-0470 Sites: US-Ho1, US-Ho2, US-Ho3
Eddy covariance measurements of carbon dioxide (CO2) and water vapour fluxes were made from June 2002 to May 2003 over a 65-year-old temperate conifer plantation forest in southern Ontario, Canada. This site is part of a newly initiated long-term tower flux measurement …
Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 223-241 (2005). DOI: 10.1016/j.agrformet.2004.10.003 Sites: CA-Ca1, CA-TP1, CA-TP2, CA-TP3, CA-TP4, US-Dk3, US-GLE, US-Ho1, US-Me4, US-Me5, US-NR1
Many monoterpenes have been identified in forest emissions using gas chromatography (GC). Until now, it has been impossible to determine whether all monoterpenes are appropriately measured using GC techniques. We used a proton transfer reaction mass spectrometer (PTR-MS) coupled with the eddy covariance (EC) technique to measure …
Journal: Atmospheric Chemistry And Physics, Volume 5 (2): 505-513 (2005). DOI: 10.5194/acp-5-505-2005 Sites: US-Blo
Observed responses of upland-oak vegetation of the eastern deciduous hardwood forest to changing CO2, temperature, precipitation and tropospheric ozone (O3) were derived from field studies and interpreted with a stand-level model for an 11-year range of environmental variation upon which scenarios of future …
Journal: Global Change Biology, Volume 11 (9): 1402-1423 (2005). DOI: 10.1111/j.1365-2486.2005.00991.x Sites: US-WBW
Understanding links between the disturbance regime and regional climate in boreal regions requires observations of the surface energy budget from ecosystems in various stages of secondary succession. While several studies have characterized fire-induced differences in surface energy fluxes from boreal ecosystems during summer months, …
Journal: Journal Of Geophysical Research, Volume 110 (D13): n/a-n/a (2005). DOI: 10.1029/2004jd005158 Sites: US-Bn1, US-Bn2, US-Bn3
A unique dataset obtained with combinations of minisodars and 915-MHz wind profilers at the Atmospheric Boundary Layer Experiments (ABLE) facility in Kansas was used to examine the detailed characteristics of the nocturnal low-level jet (LLJ). In contrast …
Journal: Journal Of Applied Meteorology, Volume 44 (10): 1593-1606 (2005). DOI: 10.1175/jam2294.1 Sites: US-Wlr
Solar radiation and dew point temperature are important input variables for many crop growth ecological, hydrological, and meteorological models. It is also well known that solar radiation and dew point temperature (and relative humidity) data are not readily available for …
Journal: Agricultural And Forest Meteorology, Volume 130 (1-2): 71-84 (2005). DOI: 10.1016/j.agrformet.2005.02.004 Sites: US-Ne1, US-Ne2, US-Ne3
Journal: Biogeosciences, Volume 2 (2): 175-187 (2005). DOI: 10.5194/bg-2-175-2005 Sites: BR-Sa1, BR-Sa3
During the summer of 2001, NO2, total peroxy nitrates (ΣPNs), total alkyl nitrates (ΣANs), HNO3, volatile organic compounds (VOC), CO2, O3, and meteorological variables were measured at Granite Bay, CA. The diurnal variation in ΣPNs, ΣANs and HNO3 were all strongly correlated …
Journal: Atmospheric Chemistry And Physics Discussions, Volume 5 (4): 4801-4843 (2005). DOI: 10.5194/acpd-5-4801-2005 Sites: US-Blo