Arid Zone Research ›› 2019, Vol. 36 ›› Issue (2): 373-386.doi: 10.13866/j.azr.2019.02.13

• Water and Climate • Previous Articles     Next Articles

Sub-Cloud Secondary Evaporation Effect of Precipitation Isotopes in Shaanxi Province from 1960 to 2016

JIAO Rong1, WANG Sheng-jie1,2, ZHANG Ming-jun1, LU Ai-gang2, WANG Xiao-yan2   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, Gansu,China;
    2. Shaanxi Province Key Laboratory for Ecology and Environment of River Wetlands, Weinan 714099, Shaanxi,China
  • Received:2018-06-22 Revised:2018-11-30 Published:2025-10-18

Abstract: A modified Stewart model was applied to simulate the variation of d-excess (Δd) in raindrops based on the daily meteorological data from 36 meteorological stations in Shaanxi Province during the period from 1960 to 2016. The relationships between Δd and other factors including relative humidity, remaining fraction and evaporation rate of raindrops were analyzed. The results showed that: ① Regarding the seasonal variations,all the highest Δd values in northern, central and southern Shaanxi Province occurred in September, and the lowest ones were found in different months. The Δd value in northern Shaanxi was lower than that of the provincial mean, and it was relatively higher in central and southern Shaanxi. During the study period, Δd in southern Shaanxi was in an increase trend, but it was slightly decreased in northern and central Shaanxi. According to the Mann-Kendall test, the abrupt changes of Δd for northern, central and southern Shaanxi occurred in 2011, 1972 and 1977 respectively; ② There was a spatial difference of Δd value in Shaanxi Province on both monthly and annual scales. The Δd value, relative humidity and remaining fraction showed an increasing pattern from the north to the south, and the trend of evaporation rate was opposite; ③ There was a significant correlation between Δd and other factors, such as relative humidity, remaining fraction and evaporation rate on the monthly and interannual scales.

Key words: Sub-Cloud secondary evaporation, precipitation, stable isotopes, deuterium excess, Shaanxi Province