树木年轮指示的柴达木东北缘近千年夏季气温变化

Summer Temperature in Northeast of Qaidam Basin Retrieved from Tree-Ring Chronology

依据采自青海海西德令哈、乌兰的树木年轮资料序列与柴达木东北缘1961～2001年夏季（6～8）平均气温资料序列之间较好的同期相关特征，重建了柴达木东北缘夏季（6～8）平均气温千年历史资料序列。运用乘积平均值、误差缩减值等方法对重建方程进行了检验，证明重建序列可信。通过分析发现，在重建的1098年中，有7个主要的冷期和6个主要的暖期，重建的气温序列存在15个主要突变时段。周期分析表明柴达木东北缘夏季气温存在46、52、61、73、91、183年和366年左右的长周期以及6．8年和2～3年的短周期。

Based on the relationship between the tree-ring data series and summer （June to August） temperature from 1962 to 2001, about thousand year＇ s summer temperature in northeast of Qaidam Basin was retrieved by using the tree-ring chronology which developed from samples collected in Delingha and Wulan in western Qinghai. Using those methods just as the Mean Value of Product and the Reduction of Error, the retrieved series was proved through testing retrieved equation. The analyses show that seven major colder periods and six warmer periods existed in retrieved series in 1098 years. Fifteen major interrupt regions existed in retrieved temperature series. The cycle analyses show that the summer temperature series in northeast of Basin has longer periods of 46 years, 52 years, 61 years,73 years,91 years, 183 years and 366 years, and shorter periods of 6.8 years and 2 -3years.