PROGRESS IN GEOGRAPHY ›› 2018, Vol. 37 ›› Issue (7): 946-953.doi: 10.18306/dlkxjz.2018.07.008

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Climatic significance of tree-ring δ18O in Shennongjia Mountain

Fangfang ZHANG1(), Yonghong ZHENG1,*(), Guoyan PAN2, Shuai YUAN1, Fanxi KONG1, Yongdong QI1, Dan WANG1   

  1. 1. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, China
    2. School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China
  • Received:2017-11-12 Revised:2018-03-07 Online:2018-07-28 Published:2018-07-28
  • Contact: Yonghong ZHENG E-mail:zffang0803@163.com;zhengyh@whu.edu.cn
  • Supported by:
    National Natural Science Foundation of China, No. 41771227

Abstract:

In this study, a stable oxygen isotope chronology from tree-ring cellulose (δ18O) in Bashan fir(Abies forrestii) from Mt. Shennongjia in Hubei Province was correlated with meteorology records of the Badong meteorological station, circulation index data, and sea surface temperature of the South China Sea (SST). The chronology spans the time period of 1790-2011. The results indicate that the tree-ring δ18O chronology is closely correlated with local climate factors. The tree-ring δ18O chronology has a significantly positive correlation with March to April monthly mean temperature, has a significantly negative correlation with June to July monthly mean precipitation and June to July monthly mean relative humidity. Meanwhile, the tree-ring δ18O chronology has a significantly positive correlation with February to March area index of the northern hemisphere subtropical high (5E-360), September area index of the South China Sea subtropical high (100E-120E), January polar vortex area index of the Pacific Ocean (Zone 2, 150E-120W), and April to May sea surface temperature of the South China Sea (SST). A significantly negative correlation was found between the tree-ring δ18O chronology and January southern oscillation index (SOI). These indicate that the tree-ring δ18O chronology records at a large scale of atmospheric circulation information.This study is helpful to further understand the potential value of tree ring stable oxygen isotopes in the past climate change studies in Mt.Shennongjia, and provide a scientific basis for further research on climate reconstruction.

Key words: tree-ring, stable oxygen isotope, precipitation, sea surface temperature of the South China Sea (SST), circulation index