Climatic significance of tree-ring delta O-18 in the Qilian Mountains, northwestern China and its relationship to atmospheric circulation patterns
| 作者: |
Liu, X.H., et al. |
| 期刊名称: |
Chemical Geology |
| 发表年度: |
2009 |
| 卷: |
268 |
| 期: |
1-2 |
| 联系作者: |
|
| 页码: |
147-154 |
| 学科: |
|
| 外单位作者单位 : |
|
| 单位代码: |
|
| 全文链接: |
http://dx.doi.org/10.1016/j.chemgeo.2009.08.005 |
| 论文全文: |
|
| 第一作者所在部门: |
|
| 论文出处: |
|
| 论文类别: |
|
| 参与作者: |
|
| 其它备注: |
|
| 摘要: |
It is important to understand the history and dynamics of climate in a transitional region between areas with different atmospheric circulation patterns, where the vegetation and ecosystems are vulnerable to environmental change. We investigated variations in the long-term oxygen isotope composition (delta O-18) in tree rings of Qinghai spruce (Picea crassifolia) and their relationships to climatic parameters in the and Qilian Mountains of northwestern China from 1870 to 2006. We found that the mean temperature from the previous November to the current February was significantly and positively correlated with the tree-ring delta O-18 values. The temperature effect, (the positive relationship between the temperature and the precipitation delta O-18 value) can explain the connection between temperature and the tree-ring delta O-18 values. Due to pooling of the earlywood and latewood into yearly tree-ring samples, it appears that the cellulose delta O-18 may be influenced by isotopically nonhomogeneous water sources and climatic conditions during the previous and current growing seasons. Subtle shifts and amplitude deviations in cellulose delta O-18 which abruptly became more positive around 1977-1978, may be attributed to the shifting climatic regime in China and to temperature variations, respectively. Our results illustrated the potential for investigating climatic or atmospheric circulation patterns based on oxygen isotope records in tree rings in regions near the interface between different large-scale synoptic circulations. (C) 2009 Elsevier B.V. All rights reserved.
|
|
论文链接 |
|
