ABSTRACT Rationale Tree‐ring cellulose stable isotopes (δ 18 O and δ 13 C) are high‐resolution proxies for reconstructing past climate variability. However, measuring carbon and oxygen isotopes separately requires substantial sample material and is time‐consuming and costly. Methods Here, using subfossil and living wood from the southern Yamal Peninsula, Russia, we extracted α‐cellulose with a plate‐based method and evaluated the reliability of pyrolysis‐derived cellulose δ 13 C (1350°C) using paired measurements against conventional combustion (1020°C; n = 954). Results The two δ 13 C datasets were strongly correlated ( r = 0.96). Pyrolysis‐derived δ 13 C showed slightly reduced variance, along with a stable proportional bias and a small mean offset (+0.17‰). No systematic drift with run order was detected. After constructing multicore mean chronologies, the two δ 13 C chronologies showed nearly identical interannual variability ( r = 0.99) and consistently captured a dominant June–August temperature signal. Moreover, δ 13 C variations in subfossil wood closely tracked those in living trees, and preservation state did not increase the inter‐method offset. Conclusions Overall, under the analytical conditions applied here, pyrolysis‐derived δ 13 C is suitable for chronology development and climate signal extraction, providing an efficient and reproducible basis for constructing dual‐isotope tree‐ring chronologies.
Lin et al. (Sat,) studied this question.