Tree-ring cellulose oxygen isotope (δ¹⁸O) in monsoon Asia (MA) is affected collectively by local hydroclimate and remote oceanic-atmospheric variations. Variations of tree-ring δ¹⁸O have been widely used for quantitative reconstructions of monsoon-season precipitation, relative humidity and drought severity. However, local hydroclimate and remote large-scale circulation's influences on tree-ring δ¹⁸O has not been fully resolved. Here, we collected 24 tree-ring δ¹⁸O chronologies covering the period of 1884–1999 across a wide range of MA and investigated the common signals of these chronologies using principal component analysis. The first principal component (PC1) of the 24 tree-ring δ¹⁸O chronologies explained 25.2% of the total variances and showed significant positive correlations with the observed Asian summer monsoon oxygen isotope index (r = 0.69) during the period of 1978–1999, suggesting that a common signal of precipitation δ¹⁸O does exist in MA and that it is highly correlated with El Niño–Southern Oscillation (ENSO) (r = 0.72) and the South Asian summer monsoon precipitation (r = −0.66). South Asian summer monsoon precipitation and ENSO are the main factors controlling this common signal of tree-ring δ¹⁸O across MA. PC1 of tree-ring δ¹⁸O chronologies in MA also depicted a negative (positive) correlation with the Atlantic Multidecadal Oscillation (Pacific Decadal Oscillation), indicating the large-scale circulation influences. After removing the large-scale circulation influences on tree-ring δ¹⁸O chronologies, however, the residual tree-ring δ¹⁸O chronologies exhibit negative correlations with the regional hydroclimate, highlighting the role local hydroclimate on the individual tree-ring δ¹⁸O variations.

亚洲季风 (MA) 的树轮纤维素氧同位素 (δ ¹⁸ O) 受当地水文气候和远程海洋大气变化的共同影响。树木年轮 δ ¹⁸ O 的变化已被广泛用于季风季节降水、相对湿度和干旱严重程度的定量重建。然而，局地水文气候和偏远大尺度环流对树轮δ ¹⁸ O的影响尚未完全解决。在这里，我们收集了涵盖 1884-1999 年期间的24 个树轮 δ ¹⁸ O 年代学，涵盖了广泛的 MA，并使用主成分分析研究了这些年代学的共同信号。24 年轮的第一主成分 (PC1) δ ¹⁸O年表解释了总方差的25.2%，并与1978-1999年期间观测到的亚洲夏季风氧同位素指数（r = 0.69）呈显着正相关，表明MA中确实存在降水δ ¹⁸ O的共同信号并且它与厄尔尼诺-南方涛动（ENSO）（r = 0.72）和南亚夏季风降水（r = -0.66）高度相关。南亚夏季风降水和 ENSO 是控制MA中树轮 δ ¹⁸ O 的这种共同信号的主要因素。年轮 δ ^{18 的}PC1MA 中的 O 年表也描述了与大西洋年代际涛动（Pacific Decadal Oscillation）的负（正）相关，表明大尺度环流的影响。移除树木年轮上的大尺度环流影响δ后^18个Ø年表，但是，剩余的树轮δ ^18个Ø年表表现出与区域hydroclimate的负相关关系，突出δ个别树木年轮上的角色本地hydroclimate ¹⁸ Ø变化。