| 乌鞘岭南、北坡降水稳定同位素特征及水汽来源对比 |
| 摘要点击 3638 全文点击 1081 投稿时间：2019-04-22 修订日期：2019-07-30 |
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| 中文关键词 乌鞘岭 南北坡 降水 氢氧同位素 水汽来源 |
| 英文关键词 Wushaoling Mountain northern and southern slope precipitation hydrogen and oxygen isotope vapor source |
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| 中文摘要 |
| 为了揭示季风边缘区降水中稳定同位素特征及水汽来源，利用2016年10月至2017年10月采集的97个降水样品，采用相关分析和HYSPLIT模型，对乌鞘岭南、北坡降水稳定同位素的特征、大气水线方程、温度和降水量效应、水汽来源进行了对比分析.结果表明，南坡大气降水线的斜率与截距低于全球大气水线（GMWL）和北坡大气降水线；南、北坡的同位素温度效应和季节效应明显，但北坡的温度效应比南坡更为明显；除北坡夏季和南坡降水量小于5 mm时降水稳定同位素表现出微弱的降水量效应，南、北坡其它季节或其它降水量级均无明显的降水量效应；来自西北和北方的水汽占90%以上，北坡受季风水汽影响极少，南坡夏季会受到东南季风影响，局地水汽再循环对乌鞘岭南、北坡水汽也有贡献.本研究可提高对高寒山区降水同位素演化的认知，为寒旱区同位素水文学的进一步研究奠定基础. |
| 英文摘要 |
| We analyze the stable isotope characteristics and vapor source of precipitation in a monsoon marginal area in the southern and northern slopes of Wushaoling Mountain, northwestern China, using 97 precipitation samples collected from October 2016 to October 2017. Correlation analysis and HYSPLIT model are used to study the characteristics of stable isotopes in precipitation, local meteoric water line equation, temperature and precipitation effects, and vapor source. The study found the following results. ① The slope and intercept of the southern slope local meteoric water line were lower than of those of the northern slope and global averages. ② Although the isotope temperature effects and seasonal effects of both slopes were obvious, the temperature effect of the northern slope was more obvious than of that of the southern slope. ③ The stable isotopes of precipitation during the summer on the northern slope and the precipitation on the southern slope<5 mm revealed that the precipitation effect was weak. There was no obvious precipitation effect in other seasons or in other precipitation levels on both slopes. ④ Vapor from the northwest and north accounted for>90% of the total. The northern slope was rarely affected by monsoon vapor, but the southern slope was affected by the southeast monsoon during the summer. Local water vapor recycling contributed to water vapor in the southern and northern slopes of Wushaoling Mountain. This study could improve the cognition of precipitation isotopic evolution in alpine regions, and lays a foundation for further research on isotope hydrology in cold and arid regions. |
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