Title: Meteorological pre-processing of incoming solar radiation and heat flux over a sparse boreal forest at a northern site during winter conditions

Authors: S.-E. Gryning, E. Batchvarova

Addresses: Riso National Laboratory, PO Box 49, DK-4000 Roskilde, Denmark. National Institute of Meteorology and Hydrology, 1784 Sofia, Bulgaria

Abstract: Measurements from Northern Finland on radiation and turbulent fluxes over a sparse boreal forest with snow-covered ground were analysed. The measurements represent harsh winter conditions characterised by low sun angles. The absorption of incoming solar radiation in clear skies (turbidity) was found to be a strong function of the solar elevation. At low solar elevation angles, commonly used expressions for turbidity did not fit the measurements well. A simple energy balance type met-processor performed well during daytime, but it was not satisfactory during night time. Simplifications and possible improvements in the energy balance model are discussed.

Keywords: meteorological processor; sensible and latent heat fluxes; solar radiation; winter conditions.

DOI: 10.1504/IJEP.2001.000649

International Journal of Environment and Pollution, 2001 Vol.16 No.1/2/3/4/5/6, pp.550-559

Published online: 09 Jul 2003 *

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