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<p>The Western Sichuan Plateau (WSP) is highly sensitive to climate change and is currently experiencing complex climate fluctuations. In this study, we investigated the historical variability and the driving mechanisms of the climate in the northern WSP before the instrument meteorological observation period. A regional tree-ring width chronology was developed based on samples collected from four sites in northern WSP. It shows the highest correlation with the annual mean temperature (from October of the previous year to September of the current year). Therefore, we reconstructed the annual mean temperature history since AD 1800. The reconstruction explained 59.9% (<i>R</i><sub>adj</sub><sup>2</sup> = 59.2%, <i>p</i> &lt; 0.001) variance of the instrumental temperature records during the calibration period (1962–2018). This 219-year record shows agreement with regional observed data and reconstruction series, indicating our reconstruction can be a representative and reliable proxy of the temperature history in northern WSP. In addition, using the Ensemble Empirical Modal Decomposition (EEMD) method, we analyzed the multi-time-scale variation characteristics of our reconstruction. Variance contributions and correlation analysis of EEMD components indicated that Atlantic Multi-decadal Oscillation (AMO) is the primary driver of the temperature variation in northern WSP. Our reconstruction revealed that the influence of AMO can be traced back to the nineteenth century. We analyzed the atmospheric circulation system and revealed the physical mechanisms of AMO’s influence. The AMO influenced the temperature in the northern WSP through the propagation of Silk Road Pattern (SRP) wave trains.</p>

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A 219-year tree-ring evidence revealing the influence of the Atlantic Multi-decadal oscillation on annual mean temperature in the northern Western Sichuan Plateau

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Xu Wu,
  • Jinjian Li,
  • Linlin Cui,
  • Xiaofei Wu,
  • Kaiqing Yang,
  • Alma Lorelei de Jesus

摘要

The Western Sichuan Plateau (WSP) is highly sensitive to climate change and is currently experiencing complex climate fluctuations. In this study, we investigated the historical variability and the driving mechanisms of the climate in the northern WSP before the instrument meteorological observation period. A regional tree-ring width chronology was developed based on samples collected from four sites in northern WSP. It shows the highest correlation with the annual mean temperature (from October of the previous year to September of the current year). Therefore, we reconstructed the annual mean temperature history since AD 1800. The reconstruction explained 59.9% (Radj2 = 59.2%, p < 0.001) variance of the instrumental temperature records during the calibration period (1962–2018). This 219-year record shows agreement with regional observed data and reconstruction series, indicating our reconstruction can be a representative and reliable proxy of the temperature history in northern WSP. In addition, using the Ensemble Empirical Modal Decomposition (EEMD) method, we analyzed the multi-time-scale variation characteristics of our reconstruction. Variance contributions and correlation analysis of EEMD components indicated that Atlantic Multi-decadal Oscillation (AMO) is the primary driver of the temperature variation in northern WSP. Our reconstruction revealed that the influence of AMO can be traced back to the nineteenth century. We analyzed the atmospheric circulation system and revealed the physical mechanisms of AMO’s influence. The AMO influenced the temperature in the northern WSP through the propagation of Silk Road Pattern (SRP) wave trains.