Uvb surface albedo measurements using biometers

Autor(es)

Marcelo de Paula Correa ^[1] ; Juan Carlos Ceballos ^[2]

Afiliação do(s) autor(es)

^[1] Universidade Federal de Itajuba. Instituto de Recursos Naturais - Brasil

^[2] Instituto Nacional de Pesquisas Espaciais. Centro de Previsão de Tempo e Estudos Climaticos - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Revista Brasileira de Geofísica; v. 26, n. 4, p. 411-416, 2008-12-00.

Resumo

This work describes ultraviolet-B albedo measurements performed over several surfaces and different atmospheric conditions. These results provide a complement to previous studies as Blumthaler & Ambach (1988), widely used as albedo reference for the main UV radiative transfer models. A custom-built albedometer composed of apair of Solarlight UVB501 biometer was used to measure the albedo over the following surfaces: green and yellowish grass, sand, wood (natural and painted), formica (synthetic plate), and iron. Influence of clouds and the sensor's response to temperature variations are also discussed. Presence of clouds on surface albedo measurement seems negligible, but athermo-regulated instrument is indispensable to an accurate analysis. Comparison with previous works shows the need for studies on the detailed characterization of the type of surface. (AU)

• Processo FAPESP: 04/00937-3 - Estudo da influência de fatores atmosféricos e geográficos sobre os níveis de radiação ultravioleta em regiões de alta densidade populacional do Estado de São Paulo
• Beneficiário: Juan Carlos Ceballos
• Modalidade de apoio: Auxílio à Pesquisa - Regular