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We investigated the tree growth and physiological response of five pine forest stands in relation to changes in atmospheric CO2 concentration (ca) and climate in the Iberian Peninsula using annually resolved width and δ13C tree‐ring chronologies since ad 1600. 13C discrimination (Δ≈ci/ca), leaf intercellular CO2 concentration (ci) and intrinsic water‐use efficiency (iWUE) were inferred from δ13C values...