“…Unfortunately, such observations were not available for N. pumilio, and therefore the parameterization obtained for the GPP of P. mariana was also used for the western Argentinian sites but constraining the simulations with phenological observations extracted from the literature. For example, to respect the annual cycle of the leaf area index (LAI) for N. pumilio (Magnin et al, 2014;Rusch, 1993), in MAIDENiso we used a seasonal LAI annual cycle with a development of leaves (LAI increase) between October and November, a maximum LAI (set at 5 leaf area/ground area) from November to April, a decreasing LAI (leaf fall) between April and May, and finally a leafless period (null LAI) from June to September (Magnin et al, 2014;Rusch, 1993). Furthermore, based on the finding that δ 18 O TR annual time series were more correlated with climate variables of specific months of the growing season (Lavergne et al, 2016), we also computed δ 18 O TR annual values by weighting the δ 18 O TR daily values (Eq.…”