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37 results on '"P.A. Brivio"'

30. Surface energy balance estimates in the Po river plain using Landsat TM, NOAA AVHRR and meteorological data

Author

P.A. Brivio, Gianpaolo Pennati, and G. Ober

Subjects
Boundary layer, Meteorology, Heat flux, Planetary boundary layer, Thematic Mapper, Energy balance, Environmental science, Humidity, Relative humidity, Atmospheric sciences, Wind speed
Abstract

The aim of this work is to assess the effectiveness of approaches for energy fluxes estimation at the boundary layer by TM, AVHRR and ground meteorological measurements, comparing the results to ground measurements. These include, besides meteorological records such as air temperature, relative humidity, air pressure and wind speed, other parameters such as total and net solar radiation, soil temperature and heat flux at different depths. The ground station is located at S. Pietro Capofiume in the south eastern Po river plain and is managed jointly by ENEL and CISE. Following experiments reported in the literature the energy balance parameters have been evaluated and compared in the authors' case from remotely sensed measurements obtained from Thematic Mapper and NOAA multitemporal datasets registered in the same days of year.

Published
2002
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37. Accumulation parameters and seasonal trends for PCBs in temperate and boreal forest plant species

Author

Nizzetto L., Pastore C., Liu X., Camporini P., Stroppiana D., Infantino A., Herbert B., Zhang G., M. Boschetti, P.A. Brivio, Jones K.C., and Di Guardo A.

Subjects
Hydrology, PCB, seasonal trend, Specific leaf area, Climate, fungi, Taiga, Growing season, Bioconcentration, General Chemistry, Vegetation, Polychlorinated Biphenyls, Intraspecific competition, Trees, LAI, Species Specificity, Boreal, Environmental chemistry, Temperate climate, Environmental Chemistry, Environmental science, Environmental Pollutants, Seasons, Forest
Abstract

The concentration of polychlorinated biphenyls (PCBs) in the air and vegetation was measured periodically in two alpine forests, during the growing season. Foliage samples from nine plant species typical of the temperate and boreal environment were collected and analyzed. Leaf concentrations of tri- and tetra-CBs showed fast response times with changing temperature and gas-phase concentrations, suggesting that a partitioning equilibrium is approached relatively rapidly (few days) in the field. Heavier compounds showed kinetically limited accumulation trends, not reaching equilibrium during the growing season. Results were used to estimate the bioconcentration factors or equilibrium plant/air partition coefficient (KPA) for each species. Values of log KPA (calculated on a mass/volume basis) ranged between 0.78 and 1.96 and were correlated to the log KOA. Uptake trends of the higher chlorinated compounds showed intraspecific differences which were partially explained by the specific leaf area (SLA).

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