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The 14 C content of tree‐rings serves as a valuable proxy for inferring past solar activity and environment change. Here we present an annually resolved tree‐ring Δ 14 C record (1850–1933 CE) from eastern China, where Δ 14 C data are rare. The weighted mean deviation between our record and IntCal20 calibration curve is −0.40 ± 0.26‰, revealing no significant regional offset. In addition, our record exhibits a strong El Niño‐Southern Oscillation (ENSO) signal and a weak solar activity signal compared to those from high‐latitude regions. During El Niño events, weakened Walker Circulation and reduced equatorial Pacific upwelling result in less 14 C‐depleted CO 2 being transported to eastern China, leading to trees using more 14 CO 2 during photosynthesis, imprinting the ENSO signal in tree‐ring Δ 14 C. This finding enhances our understanding of the global distribution of 14 C and underscores the pervasive influence of ENSO on the atmospheric circulation in tropical and subtropical regions.
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Lin et al. (2026) studied this question.
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