Isotopic composition of atmospheric precipitation and its tracing significance in the Laohequ Basin, Loess plateau, China

The Science of the Total Environment
Hao WanMeng Xing

Abstract

Based on the δ18O and δD values in precipitation and related meteorological parameters in the Chinese Loess Plateau (CLP) from June 2014 to April 2016, the effects of temperature and precipitation amount effect on stable isotopic compositions were analyzed, as well as the tracing significance of deuterium excess. The results show that the Local Meteoric Water Line (LMWL) was defined as δD = 7.08δ18O + 4.73(R2 = 0.99), with a slope of <8, indicating that a non-equilibrium evaporation process occurred when the drops fell below the cloud base in the arid and semi-arid environment. The temperature effect was defined as δD = 0.4536T-46.937.44 (r = 0.113, n = 150, p = 0.168), which shows a weak positive correlation between temperature and isotopic composition. Meanwhile, the precipitation amount effect was defined as δD = -0.7883P-34.152 (r = -0.223, n = 150, p = 0.011), which shows a weak negative correlation between temperature and isotope composition. The slopes in cross plotting δD - δ18O records were 8.3, 7.7, 7.4, and 6.3, displaying a decreasing trend in the temperature gradient of T ≤ 0 °C, 0 < T ≤ 10 °C, 10 < T ≤ 20 °C and T > 20 °C, respectively. The amount effect is significant (δD = -7.0946P + 48.686, r = -0.548, n = 20, ...Continue Reading

Citations

Jun 17, 2019·Environmental Science and Pollution Research International·Zanfang JinYasheng Shi

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