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61.
Precipitation scavenging coefficient: influence of measured aerosol and raindrop size distributions 总被引:2,自引:0,他引:2
Mihaela Mircea Sabina Stefan Sandro Fuzzi 《Atmospheric environment (Oxford, England : 1994)》2000,34(29-30)
Precipitation scavenging coefficients, widely used in pollution studies, are derived from microphysical parameterisations of aerosol particles and raindrop populations and parameterisations of their interactions. The present study investigates the effects of measured aerosol and raindrop size distributions in a microphysical polydisperse framework. The interactions between aerosol and raindrops parameterised as collision efficiency are explicitly included to account for Brownian diffusion, inertial impaction and interception. Estimated values of the polydisperse scavenging coefficients exhibit variations of orders of magnitude depending on the aerosol type and almost no variation with the raindrop size distributions. For practical use, linear relationships between the scavenging coefficients and rain intensity for different aerosol types are derived. 相似文献
62.
63.
The Barigui River watershed is located in the metropolitan region of Curitiba, southern Brazil, passing through several neighboring counties. In recent years, due to growth and disorderly occupation along the river, in addition to lack of sanitation, the Basin suffered a very large inflow of untreated domestic sewage. Current programs to monitor the watershed use traditional physical-chemical parameters and generally the analysis is performed only with water samples. This study analyzes the presence of fecal sterols in sediment samples. Sediment samples were collected from six points along the river and the stanols were extracted, purified and analyzed by GC-MS. Eight compounds were analyzed, among sterols and ketones. The presence of coprostanol was also identified. Coprostanol is a stanol containing a large amount in human feces. It is found near sources of pollution and can be associated with contamination by domestic sewage. The results showed high concentrations of coprostanol, ranging from 0.25 to 196 mug g( - 1). The ratio of coprostanol and epicoprostanol, was below 0.20 at most stations, indicating that the sewage discharged into the river does not undergo prior treatment. Contamination by untreated sewage was also confirmed by ratios of isomeric forms of sterols and ketones 5beta/(5beta + 5alpha). 相似文献
64.
Landscape-fragmentation change due to recent agricultural expansion in the Brazilian Savanna,Western Bahia,Brazil 总被引:1,自引:0,他引:1
65.
Courbet C Rivière A Jeannottat S Rinaldi S Hunkeler D Bendjoudi H de Marsily G 《Journal of contaminant hydrology》2011,126(3-4):315-329
66.
Robyn R.M. Gershon Author Vitae Julie M. Pearson Author Vitae Author Vitae David Vlahov Author Vitae Author Vitae Melissa Tracy Author Vitae Author Vitae Sandro Galea Author Vitae 《Journal of Safety Research》2008,39(6):583-588