The interdecadal relationship (10–100 years) between the Indian Summer Monsoon (ISM) and arid climate is pivotal in comprehending Asian hydroclimate dynamics. Despite extensive tree-ring based climate reconstructions conducted across both monsoonal and arid regions in the Tibetan Plateau (TP) and surroundings, the correlation between the ISM and arid climate on interdecadal scales remains contentious. In this study, we assembled a tree-ring network from 242 moisture-sensitive sites around the TP. We established composite chronologies over three regions each in southern and northern TP, revealing more pronounced interdecadal fluctuations than those identified using traditional methods. These moisture-sensitive composite chronologies demonstrated synchronous variations on interdecadal timescales throughout their common period from 1517 to 2003, encompassing the most severe drought. The concurrent hydroclimate changes around the TP exhibited the strongest correlations with the ISM-dominated Himalayan region on interdecadal scales, signifying ISM-driven synchronous changes. Furthermore, the synchronous interdecadal hydroclimate changes displayed positive associations with solar irradiance. Notably, the driest periods coincided with the most intense solar Maunder Minimum (∼1645–1715) and Dalton Minimum (∼1790–1830), further underscoring the influence of solar activity on regional hydroclimate conditions.

中文翻译：

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印度夏季风驱动青藏高原及周边地区同步年代际水文气候变化

印度夏季季风 (ISM) 与干旱气候之间的年代际关系（10-100 年）对于理解亚洲水文气候动态至关重要。尽管在青藏高原及其周边地区的季风区和干旱区进行了广泛的基于树木年轮的气候重建，但年代际尺度上的 ISM 与干旱气候之间的相关性仍然存在争议。在这项研究中，我们利用青藏高原周围 242 个湿度敏感点构建了树木年轮网络。我们对青藏高原南部和北部的三个区域建立了综合年代学，揭示了比使用传统方法确定的年代际波动更明显的年代际波动。这些对湿度敏感的复合年表显示了从 1517 年到 2003 年整个共同时期年代际时间尺度的同步变化，包括最严重的干旱。青藏高原周边水文气候变化在年代际尺度上与ISM主导的喜马拉雅地区表现出最强的相关性，表明ISM驱动的同步变化。此外，同步年代际水文气候变化与太阳辐照度呈正相关。值得注意的是，最干燥的时期恰逢太阳活动最强烈的蒙德极小期（~1645-1715）和道尔顿极小期（~1790-1830），进一步强调了太阳活动对区域水文气候条件的影响。