Moisture variations over the past millennium characterized by Qaidam Basin tree-ring δ 18O

详细信息    查看全文

• 作者：WenZhi Wang (1) (2)
  XiaoHong Liu (1) (2)
  GuoBao Xu (1) (2)
  XueMei Shao (3)
  DaHe Qin (1)
  WeiZhen Sun (1)
  WenLing An (1) (2)
  XiaoMin Zeng (1) (2)
  
• 关键词：tree ; ring δ 18O ; moisture variation ; medieval climate anomaly ; little ice age ; Qaidam Basin
• 刊名：Chinese Science Bulletin
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：58
• 期：32
• 页码：3956-3961
• 全文大小：
• 作者单位：WenZhi Wang (1) (2)
  XiaoHong Liu (1) (2)
  GuoBao Xu (1) (2)
  XueMei Shao (3)
  DaHe Qin (1)
  WeiZhen Sun (1)
  WenLing An (1) (2)
  XiaoMin Zeng (1) (2)
  
  1. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
  3. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
  
• ISSN：1861-9541

文摘

High-resolution tree-ring δ 18O chronologies covering the last millennium, although scarce, are essential in understanding patterns of climatic changes in the northeastern region of the Qinghai-Tibetan Plateau. For this study, a tree-ring δ 18O chronology with a temporal resolution of 3-years was developed from the long-lived Qilian juniper (Sabina przewalskii Kom.), extending back in time to AD 991. This long δ 18O chronology was significantly correlated with the yearly δ 18O in tree rings during the common period from 1800 to 2006, and was an effective proxy for relative humidity during the growing season. A low-frequency moisture pattern signified the occurrence of a slight drought during the Medieval Climate Anomaly, a marked occurrence of a wet period during the Little Ice Age, and a trend in increasing moisture levels, although lower than average, alongside the Twentieth Century warming trend. Comparisons to other hydroclimatic reconstructions indicate that this tree-ring δ 18O chronology serves as a reliable paleo-humidity proxy for the Qaidam Basin as well as documenting details of past humidity levels in the region.