The oxygen isotopic composition of precipitation is sensitive to the atmospheric dynamics (Dansgaard, 1964;Jouzel et al., 1994). Therefore, the tree-ring cellulose δ 18 O is increasingly used for paleoclimate reconstruction of recent centuries (e.g.,
The Western Pacific Warm Pool (WPWP) region is an important component of the global climate, which responds to changes in solar irradiance, stratospheric volcanic aerosols, and greenhouse gas concentrations via changes in the Hadley and Walker circulations, the position of the intertropical convergence zone, interhemispheric monsoons, and the El Niño-Southern Oscillation (ENSO), and in turn affects extratropical climates (e.g., Biasutti et al., 2018;Mohtadi et al., 2016; Schneider et al., 2014, references therein). To understand the variability in the hydrology of the WPWP over different time scales, paleoclimate studies are necessary because instrumental records are temporally limited.Centennial to millennial climate variability in the Holocene (the past 11,700 years) is an important research target to understand the influence of climate change on human society (e.g., Masson-Delmotte et al., 2013). Previous studies have shown that there were a number of climatic variations over different temporal and spatial scales during the Holocene. However, there are still too few paleoclimatic records with high enough temporal resolution to understand the timing of variability, its causes, and propagation mechanisms (Masson-Delmotte et al., 2013;Wanner et al., 2011). To elucidate any high-frequency climate variability, paleoclimate records with high temporal resolution are needed.Borneo is an island within the WPWP with a tropical climate and high year-round temperature and precipitation (Figure 1a). The precipitation is influenced by both the East Asian winter monsoon (EAWM) and ENSO. In the boreal winter, the strong EAWM brings moisture and enhances precipitation in NW Borneo
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