Annual time series of stable oxygen isotope and snow accumulation rate retrieved from Kuokuosele and Zuoqiupu ice cores in Tibetan Plateau

We developed the annual time series (1942-2011CE) of stable oxygen isotope (δ18O) and snow accumulation rate retrieved from Kuokuosele (38°11′34.32″ N, 75°10′57.90″ E, 5700 m a.s.l.) and Zuoqiupu (29°11′56.65″ N, 96°54′11.68″ E, 5580 m a.s.l.) ice cores in northwestern and southeastern Tibetan Plateau (TP), respectively. The annual mean δ18O record of Kuokuosele ice core shows a fluctuating warming trend from the beginning of the record to the late 1990s and then a distinct cooling until 2011.The precipitation at high elevation in the northwestern TP indicated by snow accumulation record shows an overall decreasing trend from the 1940s to the 1970s, followed by an increase with fluctuation to a peak in the late 2000s. In the southeastern TP, the reconstructed Zuoqiupu ice core snow accumulation record exhibits a short-lived wetting during the 1940s-1950s, followed by a general drying trend in the subsequent decades until present.本研究构建了1942—2011年的年际时间序列数据集，包含稳定氧同位素（stable oxygen isotope, δ¹⁸O）与积雪积累速率两项指标，数据分别取自青藏高原（Tibetan Plateau，TP）西北部的阔克赛勒（Kuokuosele）冰芯（坐标：38°11′34.32″ N, 75°10′57.90″ E，海拔5700 m a.s.l.）与东南部的左其铺（Zuoqiupu）冰芯（坐标：29°11′56.65″ N, 96°54′11.68″ E，海拔5580 m a.s.l.）。 阔克赛勒冰芯的年平均δ¹⁸O记录显示，自序列起始至20世纪90年代末呈波动增温趋势，1990年代末至2011年则出现显著降温过程。 由积雪积累记录指示的青藏高原西北部高海拔区域降水，整体呈现1940年代至1970年代的下降趋势，随后经历波动上升阶段，并于2000年代末达到峰值。 在青藏高原东南部，经重建的左其铺冰芯积雪积累记录显示，1940年代至1950年代存在短暂湿润期，此后数十年间整体呈干旱化趋势直至当前。