RADIOACTIVE TRANSFER

Author: CAMPMANY PONS ELIES.
Year: 2004.
University: BARCELONA [www.ub.es].
Place of defense: FACULTAT DE FÍSICA.
Place of preparation: UNIVERSITAT DE BARCELONA.

Summary: SUMMARY: The prediction of the UV Index is to identify the irradíancia biologically effective impact in a later time from knowledge of the factors that inteNienen in this: ozone, the zenith angle, the elevation of the site, the dispersion of air, the clouds and albedo. The influence of these factors is evident in the formulation of radiative transfer equations that solve numerically models spectral irradiance. This thesis has worked with 2 dispersion models Simplex (SMARTS2 and UVAGOA) who believe the atmosphere as a single layer and 2 models of multiple scattering (SBDART and STAR), which takes into account the no-homogeneidad vertical atmosphere and divided into an overlay layer. There has been a comparative study between them and has concluded that the models of multiple scattering get a better deal with differences between them of 2 to 3% for angles cenitales under 600.También are compared with measures instrumental and have found differences ranging between 2 and e115% in the central hours of the day. The measures instrumentals used both to compare with the departures of these models to determine its input parameters were: 4 years of írradiancia UV spectrum (285 to 400 nm every 0.5 nm) of a espectroradiómetro Bentham 300, 3 years of the UV Index measures a piranómetro ESR and 3 piranómetros Solar Light, 4 years of daily actions of a photometer Microtops and 1 year of a photometer measures CIMEL. For the determination of total column ozone has been used measures of espectroradiómetro Bentham and the photometer Microtops and have found differences of 9%. By comparison with measurements of remote sensing (TOMS and GOME) is reached RMSE of 4% for Microtops. As for the scattering due to aerosols were used as input parameters the optical thickness calculated from photometer CIMEL, while the mass of precipitable water, linked to the growth of aerosols hygroscopic, it has been determined from CIMEL light meters and Microtops and also from radiosonde. Differences obseNadas are around 12-15% among light meters and radiosonde. All these measures have been applied to model SBDART for predicting UV index in Catalonia during the years 2000-2002, using the assumption persistence of total column ozone in this work has been found to have an error of 6% summer days of clear skies. The results have been validated with piranómetro ESR and have obseNado differences around 14%. In the year 2003, he joined the prediction of ozone Deutscher Wetterdienst to 36 hours and for days of clear skies, the results improved significantly from a gap of 20% to 16%.

Author: Marín Fernández María José.
Year: 2006.
University: VALENCIA [www.uv.es].
Place of defense: Salón de grados, Facultat de Farmàcia.
Place of preparation: Facultat de Física, Universitat de València.

Summary: The overall objective of this study is to characterize the irradiance UVER in the geographical scope of the Community of Valencia. To carry it out have been established some partial objectives such as first the design, tuning and analysis of network data measurement of UVB in the Community of Valencia, which has allowed characterize irradiance UVER and predict the index UV in five locations in the territory of the Community. Moreover these results were compared with those obtained in other similar networks at national or autonomous regions in the Mediterranean. As a step in this characterization has been chosen by the directional improvement in the description of ultraviolet radiation through the development of experimental systems that allow the measurement of diffuse component and inclined planes of UVER and different orientations. We have designed a band of shade, have been studied and their potential correction has been used radiative transfer model to validate the results of the values obtained for the diffuse component of UVER to that received on inclined planes.