Continuous measurements of whole canopy isoprene emissions over an entire growing season are reported from Harvard Forest (42°32′N, 72°11′W). Emissions were calculated from the ratio of observed CO2 …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 103 (D23): 31045-31056 (1998), ISBN . DOI: 10.1029/98jd02708 Sites: US-Ha1
We analyzed the relationship between net ecosystem exchange of carbon dioxide (NEE) and irradiance (as photosynthetic photon flux density or PPFD), using published and unpublished data that have been collected during midgrowing season for carbon balance studies at seven peatlands in North America and Europe. NEE measurements included …
Journal: Global Biogeochemical Cycles, Volume 12 (1): 115-126 (1998), ISBN . DOI: 10.1029/97gb03367 Sites: CA-Mer
The authors compared methods for estimating surface fluxes under clear-sky conditions over a large heterogeneous area from a limited number of ground measurements and from satellite observations using data obtained from the southern Great Plains Cloud and …
Journal: Journal Of Applied Meteorology, Volume 37 (1): 5-22 (1998), ISBN . DOI: 10.1175/1520-0450(1998)037<0005:ECSRSF>2.0.CO;2 Sites: US-Wlr
A better understanding of the soil aggregation process is needed to address a variety of concerns, including soil quality and erosion, agricultural sustainability, soil C sequestration, the mobility of hazardous chemicals and remediation of contaminated sites. We used data …
Journal: Soil Biology And Biochemistry, Volume 30 (7): 905-916 (1998), ISBN . DOI: 10.1016/s0038-0717(97)00207-1 Sites: US-IB1, US-IB2
Energy budgets were measured at Arctic tundra ecosystems in Alaska, USA. Measurements were carried out over coastal tundra at Prudhoe Bay in 1994, and at wet sedge, moist and dry tussock tundra around Happy Valley in 1995. Sensible heat flux, H, and latent heat flux, lE, were determined by an eddy correlation technique.
Over …
Journal: Hydrological Processes, Volume 12 (13-14): 2163-2183 (1998), ISBN . DOI: 10.1002/(SICI)1099-1085(19981030)12:13/14<2163::AID-HYP727>3.0.CO;2-Y Sites: US-HVa
Based on prior evidence of coordinated multiple leaf trait scaling, we hypothesized that variation among species in leaf dark respiration rate (Rd) should scale with variation in traits such as leaf nitrogen (N), leaf life-span, specific leaf area (SLA), and net photosynthetic capacity …
Journal: Oecologia, Volume 114 (4): 471-482 (1998), ISBN . DOI: 10.1007/s004420050471 Sites: US-NR1
We describe a simple method for sampling soil gas at different profile depths and analyzing CO2 concentration in the gas sample. Soil gas samples were taken on the soil surface from each chosen depth through a gas circulation system and analyzed in situ …
Journal: Soil Biology And Biochemistry, Volume 30 (14): 2107-2112 (1998), ISBN . DOI: 10.1016/s0038-0717(98)00088-1 Sites: US-SP1, US-SP2
The objectives of this study are to establish a climatology of gravity waves in a forest and to gain insights into the dynamics of this motion type. The site is part of the BOREAS (Boreal Ecosystem—Atmosphere Study) flux monitoring network. The analysis relies mainly on 5 Hz temperature time series observed with two arrays of fine-wire …
Journal: Quarterly Journal Of The Royal Meteorological Society, Volume 124 (549): 1403-1419 (1998), ISBN . DOI: 10.1002/qj.49712454904 Sites: CA-Cbo
Measurements of nitrogen deposition and concentrations of NO, NO2, NOy (total oxidized N), and O3have been made at Harvard Forest in central Massachusetts since 1990 …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 103 (D7): 8355-8368 (1998), ISBN . DOI: 10.1029/98jd00168 Sites: US-Ha1
Measurements of net ecosystem CO2 exchange (NEE) and energy balance were made using chamber-, tower-, and aircraft-based measurement techniques in Alaskan arctic tundra ecosystems during the 1994–1995 …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 103 (D22): 28993-29003 (1998), ISBN . DOI: 10.1029/1998jd200015 Sites: US-HVa, US-Upa