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MAIDENiso: a multiproxy biophysical model of tree-ring width and oxygen and carbon isotopes

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MAIDENiso is a new version of the process-based biogeochemical model MAIDEN of tree growth. Isotopic modules have been implemented to simulate stable oxygen and carbon isotopes in tree-ring cellulose (TRC). In addition to annual increment biomass, this new model version estimates δ18O and δ13C associated with the daily amount of carbon allocated to the stem. MAIDENiso only requires daily input data: minimal and maximal air temperatures, amount of precipitation, CO2 atmospheric concentration, and δ13C in CO2. MAIDENiso simulates tree-ring width, δ18O in precipitation (δ18OP), δ18O in soil water (δ18OSW), δ18O in xylem water (δ18OXW), δ18O in cellulose (δ18OTRC), and δ13C in cellulose (δ13CTRC). The model has been calibrated and validated with tree-ring series sampled in the Fontainebleau Forest (France) from 1953 to 2000. We first calibrated several parameters for the 1977–2000 period and then validated it for the independent 1953–1976 period. Over the complete interval (1953–2000), we obtained correlations between observations and simulations above 0.5 for both isotopic series and above 0.65 for tree growth series. An important feature of the model is its ability to simulate not only extreme values of tree growth, such as the effect of 1976 drought, but also its persistence over several years.

Document Type: Research Article


Affiliations: 1: LSCE, UMR-CEA/CNRS/UVSQ 8212, Domaine du CNRS, F-91198 Gif-sur-Yvette CEDEX, France. 2: CEFE, UMR 5175 CNRS/Université de Montpellier, F-34293 Montpellier, France. 3: Aix-Marseille Université, CNRS, CEREGE UMR 7330, F-13545 Aix-en-Provence, France.

Publication date: September 17, 2012

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