Environmental Significance of Precipitation Stable Isotopic in Dadongshu Mountain of Middle Qilian Mountains

ZHANG Baijuan; LI Zongxing; WANG Yu; FENG Qi; ZOU Haiming; LI Aijun

doi:10.7522/j.issn.1000-0534.2018.00139

Plateau Meteorology >

2019 , Vol. 38 >Issue 5: 1099 - 1107

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00139

Environmental Significance of Precipitation Stable Isotopic in Dadongshu Mountain of Middle Qilian Mountains

ZHANG Baijuan ,
LI Zongxing ,
WANG Yu ,
FENG Qi ,
ZOU Haiming ,
LI Aijun

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College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;China Key Laboratory of Eco-hydrology of In-land River Basin, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences/Gansu Qilian Mountains Ecological Research Center, Lanzhou 730000, Gansu, China;Zhimenda Hydrological Station, Qinghai Hydrology and Water Resources Survey Bureau, Yushu 815100, Qinghai, China;Hydrology and Water Resources Bureau of Gansu Province, Lanzhou 730000, Gansu, China

Received date: 2018-09-18

Online published: 2019-10-28

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Abstract

To investigate the environmental significance of precipitation stable isotopic in Dadongshu Mountain of middle Qilian Mountains,the characteristics of precipitation stable isotopic and the correlations between precipitation stable isotopes and local meteorological factors were analyzed in this paper based on 145 precipitation samples from Dadongshu pass site (4146.8 m) and meteorological data at the same period in 2014.The results showed that:(1) The stable isotopes of precipitation showed a significant inter-annual fluctuations and an obvious seasonal variations.The characteristics of precipitation stable isotopes appears as a high value in Summer and autumn season,and a low value in winter and spring season.(2) Temperature effect of δ¹⁸O was significant in all precipitation events.The δ¹⁸O increases by 0.62‰ for every 1℃ temperature increasing,while the precipitation effect was not noticeable.A weak precipitation effect of δ¹⁸O only appeared in summer precipitation events which can be conclude that the temperature is the mainly factor of precipitation stable isotope evolution in present study area.(3) The δ¹⁸O and d-excess in this study area were significantly positively correlated with the averaged vapor pressure.It indicated that the stable isotopes of precipitation is significant effected on the sub-cloud evaporation in this research area.The present study provided a further understand of isotopic hydrology in inland river basins at the Qilian Mountains.

Key words： The central Qilian M; precipitation; stable isotopes; environmental signif

Cite this article

ZHANG Baijuan , LI Zongxing , WANG Yu , FENG Qi , ZOU Haiming , LI Aijun . Environmental Significance of Precipitation Stable Isotopic in Dadongshu Mountain of Middle Qilian Mountains[J]. Plateau Meteorology, 2019 , 38(5) : 1099 -1107 . DOI: 10.7522/j.issn.1000-0534.2018.00139

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