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<p>The progressive annual reduction of forest resources and the associated changes in their ecological environment in the Lesser Khingan Mountains (LKM), northeast China have attracted considerable attention. However, the existing long-term climate records for this region exhibit significant spatial and temporal deficiencies, making long-term paleoclimate reconstruction studies based on tree-ring data particularly crucial. This study utilized tree-ring width data from <i>Pinus koraiensis</i> in the LKM to reconstruct the mean April-November temperature variations from 1789 to 2022. The results indicate that over the past 234 years, the LKM region has experienced two warm periods (1876–1904, 2008–2022) and two cold periods (1808–1825, 1953–1972). Multi-taper method analysis reveals the existence of the 44.2-year multidecadal cycle, 9.8-12.6-year decadal cycles, and 2.6-3.9-year interannual cycles in the LKM temperature. Moreover, the Greater Khingan Mountains also experienced two significant warming periods similar with the LKM. The available evidence suggests a potential association between these two warm events and the synergistic effects of large-scale climate drivers, such as the Pacific decadal oscillation and solar activity. Conversely, the warming trend in the Laobai Mountains region has been comparatively weaker, likely influenced by topographical factors and the Atlantic multidecadal oscillation.</p>

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Solar activity and Pacific decadal oscillation caused abnormally warming in the Khingan Mountains of Northeast China during 1876–1904

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Zhuoying Li,
  • Changfeng Sun,
  • Yu Liu,
  • Xuan Wu,
  • Mengdan Jing,
  • Jiachuan Wang,
  • Qiufang Cai,
  • Meng Ren,
  • Huiming Song,
  • Qiang Li

摘要

The progressive annual reduction of forest resources and the associated changes in their ecological environment in the Lesser Khingan Mountains (LKM), northeast China have attracted considerable attention. However, the existing long-term climate records for this region exhibit significant spatial and temporal deficiencies, making long-term paleoclimate reconstruction studies based on tree-ring data particularly crucial. This study utilized tree-ring width data from Pinus koraiensis in the LKM to reconstruct the mean April-November temperature variations from 1789 to 2022. The results indicate that over the past 234 years, the LKM region has experienced two warm periods (1876–1904, 2008–2022) and two cold periods (1808–1825, 1953–1972). Multi-taper method analysis reveals the existence of the 44.2-year multidecadal cycle, 9.8-12.6-year decadal cycles, and 2.6-3.9-year interannual cycles in the LKM temperature. Moreover, the Greater Khingan Mountains also experienced two significant warming periods similar with the LKM. The available evidence suggests a potential association between these two warm events and the synergistic effects of large-scale climate drivers, such as the Pacific decadal oscillation and solar activity. Conversely, the warming trend in the Laobai Mountains region has been comparatively weaker, likely influenced by topographical factors and the Atlantic multidecadal oscillation.