College of Environmental Sciences and Engineering, Peking University, Yiheyuan Road, No. 5, Haidian District, Beijing, 100871, China.
Department of Chemistry and Environmental Science, Tibet University, Lhasa, 850000, China.
Environ Sci Pollut Res Int. 2019 Sep;26(27):28243-28255. doi: 10.1007/s11356-019-05945-x. Epub 2019 Jul 31.
The Tibetan Plateau is known as the "Asian water tower," and the Yarlung Tsangpo (YT) River is the largest river that originates in and flows across the southern Tibetan Plateau. Although the solute source of YT River has been extensively and qualitatively analyzed, there is a lack of the quantitative analysis for the whole basin and seasonal variation of hydrochemical characteristics. Here, 212 samples obtained in the mainstream and tributary of YT River in different (wet, normal, and dry) periods were used for the solute apportionment using the mass balance model. The results showed that the solutes in YT River water were mainly derived from the carbonate and silicate rock weathering that accounts 42.2% and 26.9% in the total solute source, respectively, as the complex geological conditions in the basin. A part of the ions (7.5%) was also originated from the atmospheric precipitation as the abundant rainfall in the wet period. Meanwhile, the contribution of solute sources had no significantly seasonal variation in the upstream, whereas it had significantly seasonal variation in the downstream with the tropical climate and heavy rainfall. Importantly, the rock weathering of the basin could consume so much atmospheric CO (0.54% of the consumption at global with the only 0.16% of the global surface area) that could mitigate the global warming, which followed an increasing trend from upstream to downstream. The quantitative analysis of the solute source for YT River fills in the gaps in the chemically characteristic cognition of the basin. It is beneficial for the water resource management for the Asian. The proportion of solute sources in the YT River and its tributaries for wet (W), normal (N), and dry (D) periods.
青藏高原被称为“亚洲水塔”，雅鲁藏布江是发源于并流经藏南地区的最大河流。尽管已经对雅鲁藏布江的溶质来源进行了广泛的定性分析，但对于整个流域和水化学特征的季节性变化，缺乏定量分析。在这里，我们使用质量平衡模型，对雅鲁藏布江干流和支流在不同（湿、正常和干）时期采集的 212 个样本进行了溶质分配。结果表明，雅鲁藏布江水中的溶质主要来源于碳酸盐和硅酸盐岩的风化，分别占总溶质源的 42.2%和 26.9%，这是由于流域内复杂的地质条件。一部分离子（7.5%）也来源于大气降水，因为在湿期降雨丰富。同时，在上游地区，溶质来源的贡献没有明显的季节性变化，而在下游地区，由于热带气候和强降雨，溶质来源的贡献有明显的季节性变化。重要的是，流域内的岩石风化可以消耗大量的大气 CO（占全球消耗量的 0.54%，而全球表面积仅占 0.16%），从而减轻全球变暖的影响，这种趋势从上游到下游逐渐增加。雅鲁藏布江溶质来源的定量分析填补了该流域化学特征认知的空白。它有利于亚洲的水资源管理。雅鲁藏布江及其支流在湿（W）、正常（N）和干（D）时期的溶质来源比例。
