River flow reconstruction using stalagmite oxygen isotope δ18O: An example of the Jialingjiang River, China.
River flow reconstruction using stalagmite oxygen isotope δ18O: An example of the Jialingjiang River, China.
复制标题
使用石笋氧同位素 δ18O 重建河流流量：以中国嘉陵江为例。
DOI：
10.1016/j.jhydrol.2014.12.020
复制
发表时间：
2015
影响因子：
6.4
通讯作者：
Jiongxin Xu
中科院分区：
文献类型：
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作者：
Jiongxin Xu
The instrument-based hydrometric data from most rivers in China and in the world are only 50–60 years and there is an urgent need for reconstruction of river flow using various proxy data. We have found that the stalagmite oxygen isotope δ18O record can be used for this purpose. Zhang et al. (2008) established a 1800-year high-resolution cave δ18O record from the Wanxiang Cave located in the drainage basin of the Jialingjiang River, a major tributary of the Changjiang River. These data were used in the present study to reconstruct the precipitation and river flow. We found that the 5-year averages of annual precipitation over the Jialingjiang River basin (Pm,J,5m) and the annual river flow at Beibei hydrometric station (Qw,B,5m) are closely correlated with the 5-year average of the Wanxiang cave δ18O (δ18O5m). The regression equations betweenPm,J,5mand δ18O5mwere established, withR2= 0.4852,F(1, 46) = 43.360,p= 3.83 × 10−8, standard error of estimate SE = 0.04335. The regression equations betweenQw,B,5mand δ18O5mwas also established, withR2= 0.6177,F(1, 42) = 67.869,p= 2.6 × 10−10, SE = 0.09732. The δ18O5mvariation can explains 48.5% and 61.8% of the variations inPm,J,5mandQw,B,5m, respectively. Based on the two equations and using the δ18O5mdata from 192 to 1951,Pm,J,5mandQw,B,5mover the past 1800 years have been reconstructed, which show a decreasing first-order trend between ca. 600 and 1600 AD followed by an increasing trend. At shorter timescales, 11 sub-periods were divided. The eleven sub-periods may be classified as two types: slowly changing over long timescales (Type I) and rapidly changing over short timescales (Type II).
