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Multiple Steady-states in the Terrestrial Atmosphere-biosphere System: a Result of a Discrete Vegetation Classification? : Volume 4, Issue 1 (22/02/2007)

By Kleidon, A.

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Book Id: WPLBN0003976919
Format Type: PDF Article :
File Size: Pages 19
Reproduction Date: 2015

Title: Multiple Steady-states in the Terrestrial Atmosphere-biosphere System: a Result of a Discrete Vegetation Classification? : Volume 4, Issue 1 (22/02/2007)  
Author: Kleidon, A.
Volume: Vol. 4, Issue 1
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Low, C., Fraedrich, K., & Kleidon, A. (2007). Multiple Steady-states in the Terrestrial Atmosphere-biosphere System: a Result of a Discrete Vegetation Classification? : Volume 4, Issue 1 (22/02/2007). Retrieved from http://www.ebooklibrary.org/


Description
Description: Biospheric Theory and Modelling Group, Max-Planck-Institut für Biogeochemie, Postfach 10 01 24, 07701 Jena, Germany. Multiple steady states in the atmosphere-biosphere system can arise as a consequence of interactions and positive feedbacks. While atmospheric conditions affect vegetation productivity in terms of available light, water, and heat, different levels of vegetation productivity can result in differing energy- and water partitioning at the land surface, thereby leading to different atmospheric conditions. Here we investigate the emergence of multiple steady states in the terrestrial atmosphere-biosphere system and focus on the role of how vegetation is represented in the model: (i) in terms of a few, discrete vegetation classes, or (ii) a continuous representation. We then conduct sensitivity simulations with respect to initial conditions and to the number of discrete vegetation classes in order to investigate the emergence of multiple steady states. We find that multiple steady states occur in our model only if vegetation is represented by a few vegetation classes. With an increased number of classes, the difference between the number of multiple steady states diminishes, and disappears completely in our model when vegetation is represented by 8 classes or more. Despite the convergence of the multiple steady states into a single one, the resulting climate-vegetation state is nevertheless less productive when compared to the emerging state associated with the continuous vegetation parameterization. We conclude from these results that the representation of vegetation in terms of a few, discrete vegetation classes can result (a) in an artificial emergence of multiple steady states and (b) in a underestimation of vegetation productivity. Both of these aspects are important limitations to be considered when global vegetation-atmosphere models are to be applied to topics of global change.

Summary
Multiple steady-states in the terrestrial atmosphere-biosphere system: a result of a discrete vegetation classification?

Excerpt
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