亚洲中部高山降水稳定同位素空间分布特征

摘要/Abstract

摘要： 为了揭示中亚高山地区大气降水稳定同位素的时空分布特征，开展不同尺度下干旱区水文循环的研究，分析了亚洲中部天山、昆仑山、祁连山地区18个站点的降水氢氧稳定同位素资料。结果表明：天山、昆仑山和祁连山地区降水稳定同位素季节变化较为明显，表现出夏半年高、冬半年低的变化趋势。3个地区降水稳定同位素的空间分布也呈现出显著的季节差异。除昆仑山外，天山和祁连山大气降水线方程的斜率均低于全球大气降水线，说明这些地区的降水受到较强的蒸发影响。研究区各站点降水稳定同位素均呈显著的温度效应，区域内降水量效应不明显。春、夏季昆仑山地区3站点的降水δ¹⁸O高程效应较明显，降水δ¹⁸O随海拔上升而降低，其余地区没有明显的高程效应。除昆仑山地区西合休外，亚洲高山地区氘盈余(d值)总体表现出冬半年高，夏半年低的变化趋势。

关键词: 高山, 降水, 稳定同位素, 时空分布, 亚洲中部

Abstract: As an input factor of water cycle,precipitation is a primary source of surface water and groundwater,especially in arid Central Asia.As a useful tracer,the precipitation isotopic composition has become as an important tool for researching the regional water cycle.In order to reveal the spatial and temporal distribution of precipitation stable isotope in arid area in Central Asia,this paper analyzed the precipitation isotopic composition samples collected from 18 stations in the Tianshan Mountains (Wuqia,Akqi,Shali Guilanke,Shenmuyuan,Bayanbulak,Balguntay,Huangshuigou,Urumqi River Hero Bridge,Barkol and Yiwu),Kunlun Mountains (Sharman,Xihexiu and Jiangka) and Qilian Mountains (Yeniugou,Dayekou,Daiqian,Jinqiangyi and Anyuan) in Central Asia.According to the results,a clearly seasonal variation of the values of precipitation isotopic composition could be observed,and the values were high in summer but low in winter in these three regions.The seasonal fluctuation of the values in the three study regions was significant.The slopes of the atmospheric precipitation equation of the Tianshan Mountains and Qilian Mountains were lower than that of the global one except that of the Kunlun Mountains,which revealed that the regional precipitation in these regions was affected by the strong evaporation.Precipitation at all the stations was mainly affected by temperature.The values of precipitation δ¹⁸O at the three stations in the Kunlun Mountains in spring and summer was obviously affected by altitude,and they were decreased with the increase of altitude but affected slightly in other regions.The d values of the alpine zones in Central Asia were holistically high in winter but low in summer expect at Xihexiu Station in the Kunlun Mountains.

Key words:

alpine zone')">

alpine zone, precipitation, stable isotope, spatiotemporal distribution, Central Asia

孙从建, 张子宇, 陈伟, 李伟, 陈若霞.

亚洲中部高山降水稳定同位素空间分布特征 [J]. 干旱区研究, 2019, 36(1): 19-28.

SUN Cong-jian, ZHANG Zi-yu, CHEN Wei, LI Wei, CHEN Ruo-xia. Spatial Distribution of Precipitation Stable Isotopes in the Alpine Zones in Central Asia[J]. Arid Zone Research, 2019, 36(1): 19-28.

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