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Forest summer albedo is sensitive to species and thinning: How should we account for this in Earth system models?

Otto, J.; Berveiller, D.; Bréon, F.-M. et al.

2014 • In Biogeosciences, 11 (8), p. 2411-2427

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https://hdl.handle.net/2268/209498

DOI
10.5194/bg-11-2411-2014

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Abstract :

[en] Although forest management is one of the instruments proposed to mitigate climate change, the relationship between forest management and canopy albedo has been ignored so far by climate models. Here we develop an approach that could be implemented in Earth system models. A stand-level forest gap model is combined with a canopy radiation transfer model and satellite-derived model parameters to quantify the effects of forest thinning on summertime canopy albedo. This approach reveals which parameter has the largest affect on summer canopy albedo: we examined the effects of three forest species (pine, beech, oak) and four thinning strategies with a constant forest floor albedo (light to intense thinning regimes) and five different solar zenith angles at five different sites (40° N 9° E-60° N 9° E). During stand establishment, summertime canopy albedo is driven by tree species. In the later stages of stand development, the effect of tree species on summertime canopy albedo decreases in favour of an increasing influence of forest thinning. These trends continue until the end of the rotation, where thinning explains up to 50% of the variance in near-infrared albedo and up to 70% of the variance in visible canopy albedo. <br><br> The absolute summertime canopy albedo of all species ranges from 0.03 to 0.06 (visible) and 0.20 to 0.28 (near-infrared); thus the albedo needs to be parameterised at species level. In addition, Earth system models need to account for forest management in such a way that structural changes in the canopy are described by changes in leaf area index and crown volume (maximum change of 0.02 visible and 0.05 near-infrared albedo) and that the expression of albedo depends on the solar zenith angle (maximum change of 0.02 visible and 0.05 near-infrared albedo). Earth system models taking into account these parameters would not only be able to examine the spatial effects of forest management but also the total effects of forest management on climate. © 2014 Author(s).

Disciplines :

Earth sciences & physical geography

Author, co-author :

Otto, J.; LSCE, CEA-CNRS-UVSQ, Gif-sur-Yvette, France

Berveiller, D.; CNRS, Université Paris-Sud-AgroParisTech, Orsay, France

Bréon, F.-M.; LSCE, CEA-CNRS-UVSQ, Gif-sur-Yvette, France

Delpierre, N.; CNRS, Université Paris-Sud-AgroParisTech, Orsay, France

Geppert, G.; Max Planck Institute for Meteorology, Hamburg, Germany

Granier, A.; Institut Nationale de la Recherche Agronomique, Unité Ecophysiologie Forestières, Champenoux, France

Jans, W.; Alterra, Wageningen University and Research Centre, Wageningen, Netherlands

Knohl, A.; Georg August University of Göttingen, Göttingen, Germany

Kuusk, A.; Tartu Observatory, Tõravere, Estonia

Longdoz, Bernard ; Institut Nationale de la Recherche Agronomique, Unité Ecophysiologie Forestières, Champenoux, France

More authors (5 more)

Language :

English

Title :

Forest summer albedo is sensitive to species and thinning: How should we account for this in Earth system models?

Publication date :

2014

Journal title :

Biogeosciences

ISSN :

1726-4170

eISSN :

1726-4189

Publisher :

European Geosciences Union

Volume :

11

Issue :

8

Pages :

2411-2427

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

242564

Funders :

ERC - European Research Council [BE]

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