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Bremer, D. J., Ham, J. M.
Spring burning of dead biomass in tallgrass prairie is a common practice that may influence heat and water vapor transport from the landscape. Bowen ratio methods were used to measure the surface energy balances and evapotranspiration (ET) from burned (B) and unburned (UB) prairie near Manhattan, KS, USA. Data were collected from …
Journal: Agricultural And Forest Meteorology, Volume 97 (1): 43-54 (1999), ISBN . DOI: 10.1016/s0168-1923(99)00034-9 Sites: US-KFB, US-Kon
Anthoni, P. M., Law, B. E., Unsworth, M. H.
Eddy covariance measurements of carbon dioxide and water vapor exchange were made above a ponderosa pine (Pinus ponderosa Dougl. ex P. and C. Laws.) forest located in a semiarid environment in central Oregon. The stand is a mixture of old-growth and young trees. Annual net carbon gain by the ecosystem (NEE) was 320 ± 170 gC m−2year−1 …
Journal: Agricultural And Forest Meteorology, Volume 95 (3): 151-168 (1999), ISBN . DOI: 10.1016/s0168-1923(99)00029-5 Sites: US-Me4
Lee, X., Fuentes, J. D., Staebler, R. M., Neumann, H. H.
This paper reports the results of the analysis of eddy covariance CO2 data obtained at a successional forest of maple and aspen at Camp Borden in southern Ontario, Canada, between July 1995 and December 1997. Main findings are (1) The Michaelis-Menton model explains >50–65% of the observed variance of the daytime …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D13): 15975-15984 (1999), ISBN . DOI: 10.1029/1999jd900227 Sites: CA-Cbo
Schade, G. W., Goldstein, A. H., Lamanna, M. S.
Monoterpene mixing ratios and fluxes were measured above a ponderosa pine plantation in the Sierra Nevada mountains from July to October 1998. Data were obtained during a variety of weather regimes including periods of extreme heat and dryness as well as during rain. Monoterpene emissions were highly elevated during and after the …
Journal: Geophysical Research Letters, Volume 26 (14): 2187-2190 (1999), ISBN . DOI: 10.1029/1999gl900444 Sites: US-Blo
Gu, L., Shugart, H. H., Fuentes, J. D., Black, T., Shewchuk, S. R.
An integrated model of canopy micrometeorology and exchanges of mass and energy was developed and tested for a two-story boreal forest. Roles of different elements of this forest ecosystem in determining net ecosystem exchanges (NEEs) of sensible heat, water vapor and CO2 were analyzed by using the model. In this model, …
Journal: Agricultural And Forest Meteorology, Volume 94 (2): 123-148 (1999), ISBN . DOI: 10.1016/s0168-1923(99)00006-4 Sites: CA-Oas
Gu, L., Fuentes, J. D., Shugart, H. H., Staebler, R. M., Black, T. A.
We analyzed half-hourly tower-based flux measurements of carbon dioxide (CO2) from a boreal aspen forest and a temperate mixed deciduous forest in Canada to examine the influences of clouds on forest carbon uptake. We showed that the presence of clouds consistently and significantly increased the net ecosystem exchanges …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D24): 31421-31434 (1999), ISBN . DOI: 10.1029/1999jd901068 Sites: CA-Cbo
Pryor, S. C., Barthelmie, R. J., Jensen, B.
This paper presents observations of ammonia, nitric acid and size segregated chemically speciated aerosols above the canopy of a secondary successional deciduous forest in Indiana during spring. Average nitric acid concentrations range between 0.1–1 µg m−3 and vertical gradients from 1 to 9 ng m−3 / m. …
Journal: Geophysical Research Letters, Volume 26 (6): 691-694 (1999), ISBN . DOI: 10.1029/1999gl900066 Sites: US-MMS
Flanagan, L. B., Kubien, D. S., Ehleringer, J. R.
We measured the stable isotope ratio of respired carbon dioxide at two spatial scales in a black spruce forest in northern Canada: CO2 released from the forest floor and CO2 released from the entire ecosystem at night. Despite wide variation in the δ13C values of organic matter among above-ground plant species, …
Journal: Tellus Series B-Chemical and Physical Meteorology., Volume 51 (2): n/a-n/a (1999), ISBN . DOI: 10.3402/tellusb.v51i2.16306 Sites: CA-Let
Amiro, B., MacPherson, J. I., Desjardins, R. L.
Fire is the dominant stand-replacing agent in the Canadian boreal forest, but few quantitative measurements are available on the micrometeorological effects of fire. Airborne flux measurements during the BOREAS experiment were referenced to age of burn along a 500-km transect …
Journal: Agricultural And Forest Meteorology, Volume 96 (4): 199-208 (1999), ISBN . DOI: 10.1016/s0168-1923(99)00050-7 Sites: CA-Man
Roujean, J.
This paper shows the results of solar flux measurements routinely collected within boreal conifer forests during BOREAS 1994. Such vegetation have open canopies with a high level of clumping and covered by crowns which yields strong directional effects on the spectral hemispherical …
Journal: Agricultural And Forest Meteorology, Volume 93 (1): 1-6 (1999), ISBN . DOI: 10.1016/s0168-1923(98)00110-5 Sites: CA-Obs, CA-Ojp