Deciphering past climate variability in the Western Pacific Warm Pool (WPWP), the Earth’s largest heat and moisture centre, is vital for understanding the global climate system. Nevertheless, its long-term evolution remains controversial, largely due to ambiguities in existing proxy interpretations and discrepancies between records. Here, we present a weathering and erosion reconstruction from the WPWP spanning the last 140,000 years, based on the mineralogy and geochemistry of a sediment core from offshore of northern New Guinea. The paleo-weathering reconstruction is consistent with the simulated precipitation evolution on nearby islands, thereby suggesting a close coupling between climate variability and island weathering in a tropical setting. In addition, our combined data-model interpretation of WPWP climate history shows many similarities to the East Asian Summer Monsoon (EASM) variability over orbital timescales. Overall, our study highlights the critical role of precession-paced interhemispheric energy redistribution, via the West Pacific meridional sea-surface pressure gradient, in linking orbital-scale WPWP climate and EASM variability.

破译地球最大的热量和水分中心西太平洋暖池（WPWP）过去的气候变化对于了解全球气候系统至关重要。然而，其长期演变仍然存在争议，这主要是由于现有代理解释的含糊性和记录之间的差异。在这里，我们基于新几内亚北部近海沉积物核心的矿物学和地球化学，展示了过去 14 万年的 WPWP 的风化和侵蚀重建。古风化重建与附近岛屿的模拟降水演化一致，从而表明热带环境中气候变化与岛屿风化之间存在密切联系。此外，我们对 WPWP 气候历史的组合数据模型解释显示出与东亚夏季风（EASM）在轨道时间尺度上的变化有许多相似之处。总体而言，我们的研究强调了进动节奏的半球间能量重新分配通过西太平洋经向海面压力梯度在连接轨道尺度 WPWP 气候和 EASM 变化方面的关键作用。