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Predicting the Response of the Amazon Rainforest to Persistent Drought Conditions Under Current and Future Climates: a Major Challenge for Global Land Surface Models : Volume 7, Issue 4 (08/08/2014)

By Joetzjer, E.

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Book Id: WPLBN0004009714
Format Type: PDF Article :
File Size: Pages 46
Reproduction Date: 2015

Title: Predicting the Response of the Amazon Rainforest to Persistent Drought Conditions Under Current and Future Climates: a Major Challenge for Global Land Surface Models : Volume 7, Issue 4 (08/08/2014)  
Author: Joetzjer, E.
Volume: Vol. 7, Issue 4
Language: English
Subject: Science, Geoscientific, Model
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Fisher, R., Ciais, P., Meir, P., Delire, C., L. Da Cost, A. C., Christoffersen, B.,...Ferreira, L. V. (2014). Predicting the Response of the Amazon Rainforest to Persistent Drought Conditions Under Current and Future Climates: a Major Challenge for Global Land Surface Models : Volume 7, Issue 4 (08/08/2014). Retrieved from

Description: CNRM-GAME UMR3589, Groupe d'étude de l'atmosphère météorologique, Toulouse, France. While a majority of Global Climate Models project dryer and longer dry seasons over the Amazon under higher CO2 levels, large uncertainties surround the response of vegetation to persistent droughts in both present-day and future climates.

We propose a detailed evaluation of the ability of the ISBACC Land Surface Model to capture drought effects on both water and carbon budgets, comparing fluxes and stocks at two recent ThroughFall Exclusion (TFE) experiments performed in the Amazon. We also explore the model sensitivity to different Water Stress Function (WSF) and to an idealized increase in CO2 concentration and/or temperature.

In spite of a reasonable soil moisture simulation, ISBACC struggles to correctly simulate the vegetation response to TFE whose amplitude and timing is highly sensitive to the WSF. Under higher CO2 concentration, the increased Water Use Efficiency (WUE) mitigates the ISBACC's sensitivity to drought.

While one of the proposed WSF formulation improves the response of most ISBACC fluxes, except respiration, a parameterization of drought-induced tree mortality is missing for an accurate estimate of the vegetation response. Also, a better mechanistic understanding of the forest responses to drought under a warmer climate and higher CO2 concentration is clearly needed.

Predicting the response of the Amazon rainforest to persistent drought conditions under current and future climates: a major challenge for global land surface models

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