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

Abstract

International audienceMAIDENiso 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 delta O-18 and delta C-13 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 delta C-13 in CO2. MAIDENiso simulates tree-ring width, delta O-18 in precipitation (delta O-18(P)), delta O-18 in soil water (delta O-18(SW)), delta O-18 in xylem water (delta O-18(XW)), delta O-18 in cellulose (delta O-18(TRC)), and delta C-13 in cellulose (delta C-13(TRC)). 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

Ecophysiological modeling of photosynthesis and carbon allocation to the tree stem in the boreal forest

“…and Quercus spp. (Gaucherel et al, 2008a, b;Danis et al, 2012;Misson, 2004;Misson et al, 2004;Boucher et al, 2014;Gea-Izquierdo et al, 2015, 2017. Thus far, the model has never been used to simulate forest growth under boreal conditions.…”

Towards the assimilation of tree-ring-width records using ensemble Kalman filtering techniques

“…Accordingly, the assimilation of a given proxy type should be pursued on its own merits, using a forward model able to simulate the climate recording processes specific to that particular kind of proxy record. Nowadays, there exist forward models for many different proxy types, most notably TRW Evans et al 2006;Tolwinski-Ward et al 2011), treering isotopes (Roden et al 2000;Danis et al 2012;Evans 2007), coral isotopes (Thompson et al 2011), ocean sediments (Heinze 2001;Schmidt 1999) and stalagmite isotopes (Baker et al 2012). There are also initiatives to model the transport of isotopes within the atmosphere (Sturm et al 2010).…”

An inverse modeling approach for tree-ring-based climate reconstructions under changing atmospheric CO<sub>2</sub> concentrations

“…Here, we present a reconstruction performed from the inversion of the MAIDENiso model (Danis et al, 2012), an updated version of the MAIDEN model (Misson, 2004) that accounts for carbon and oxygen isotope fractionation. MAIDENiso is a full ecophysiological model, meaning that the links between meteorological (input) variables and (output) tree ring variables (e.g tree ring widths, carbon and oxygen isotopes) are not empirically parametrized as in a regression, but explicitly represented as mathematical equations within the model.…”

“…Recently, the model was completed by Danis et al (2012) to capture the main variations of δ 18 O and δ 13 C of tree ring cellulose found in sessile oak (Quercus petraea Matt.). In the forward mode, it uses relatively simple meteorological inputs: daily precipitation (cm d −1 ), minimum and maximum temperature ( • C).…”

“…For an extensive review of the processes and how they are modeled, readers are referred to the original works by Misson (2004) and Danis et al (2012). The algorithm includes several allocation rules that distribute biomass production, carbon and oxygen isotopes in various reservoirs such as leafs, bole, roots, and storage.…”