Geographical gradients in boreal forest albedo and structure in Finland

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http://hdl.handle.net/10138/144121

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Lukes , P , Rautiainen , M , Manninen , T , Stenberg , P & Mottus , M 2014 , ' Geographical gradients in boreal forest albedo and structure in Finland ' , Remote Sensing of Environment , vol. 152 , pp. 526-535 . https://doi.org/10.1016/j.rse.2014.06.023

Title: Geographical gradients in boreal forest albedo and structure in Finland
Author: Lukes, Petr; Rautiainen, Miina; Manninen, Terhikki; Stenberg, Pauline; Mottus, Matti
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Geosciences and Geography
Date: 2014
Language: eng
Number of pages: 10
Belongs to series: Remote Sensing of Environment
ISSN: 0034-4257
URI: http://hdl.handle.net/10138/144121
Abstract: Land surface albedo is an essential climate variable controlling the planetary radiative energy budget, yet it is still among the main uncertainties of the radiation budget in the current climate modeling. To date, albedo satellite products have not been linked to extensive forest inventory data sets due to the lack of ground reference data. Here, we used comprehensive and detailed maps of forest inventory variables to couple forest structure and MODIS albedo products for both winter and summer conditions. We investigated how the relationships between forest variables and albedo change seasonally and along latitudinal gradients in the forest biomes of Finland between 60° and 70° N. We observed an increase in forest albedo with increasing latitude in winter but not in summer. Also, relationships between forest variables and the black-sky albedo or directional–hemispherical reflectance (DHR) at different latitudes were tighter in winter than in summer, especially for forest biomass. Summer albedo was only weakly correlated with the traditional inventory variables. Our findings suggest that the relationships between forest variables and DHR depend on latitude.
Subject: Albedo
Boreal forest
Forest inventory
MODIS
SEASONAL-VARIATION
SURFACE ALBEDO
REFLECTANCE
SNOW
SIMULATIONS
RETRIEVALS
VARIABLES
1172 Environmental sciences
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