Reconstruction of precipitation variation from tree rings in recent 1000 years in Delingha, Qinghai

摘要: Using seven well-replicated Qilian juniper (Sabina przewalskii Kom.) ring-width chronologies developed at Zongwulong and Shalike Mts. in the northeastern part of Qaidam Basin annual precipitation from previous July to current June recent 1000 years was re- constructed for Delingha. The reconstruction can capture 63.1% variance equation stable over time. For reconstructed precipitation, wet periods occurred AD1520—1633 1933—2001, whereas dry intervals 1429—1519 1634—1741. In ad- dition, magnitude variation lower before 1430 with about 15 mm, but it increased 30 mm during period 1850. After 1850, de- creased again. contrast increase temperature, a decrease evident since 1990s. agreement low-frequency between glacier accumulation particulate content Dunde ice cores several hundred suggested that this study rather reliable, represented regional signal. This 1000-year could benefit our understanding climatic decadal century-scale region, provide basic data climate models prediction future 21st century.