%0 Research note
%T Measuring the vertical albedo profile of a subarctic boreal forest canopy
%A Riihelä, Aku
%A Manninen, Terhikki
%D 2008
%J Silva Fennica
%V 42
%N 5
%R doi:10.14214/sf.228
%U https://silvafennica.fi/article/228
%X The validation of airborne and satellite-derived albedo measurements  suffers from the fact that the surface albedo of forest is difficult to  measure in-situ over large areas. The goal of this study is to examine  whether or not the estimation of the surface albedo of a forest stand  from ground level measurements is possible. In addition, knowledge about  the vertical behavior of albedo, and therefore transmitted solar  radiation, is important in the modeling of interactions of sunlight with  the forest canopy. Such modeling is useful for forest growth  estimations among other things. To achieve these goals, an albedometer  set-up capable of vertical albedo profiling has been used to obtain data  from a boreal forest stand in Northern Finland during periods in summer  2006 and winter 2007. The results show a strong relationship between  the data and fitted power-law regression curves. Power-law regression  fits best likely because of the radiation transmission characteristics  of boreal forest.