Gao Yang, Hao Zhuo, Yang Tiantian, He Nianpeng, Tian Jing, Wen Xuefa
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, People's Republic of China.
Department of Civil and Environmental Engineering, University of California, Irvine, CA, 92697, USA.
Environ Sci Pollut Res Int. 2016 Oct;23(20):20388-20401. doi: 10.1007/s11356-016-7254-4. Epub 2016 Jul 25.
In order to better understand air pollution in deve-loping regions, such as China, it is important to investigate the wet deposition behavior of atmospheric trace metals and its sources in the subtropical watershed. This paper studies the seasonal change of trace metal concentrations in precipitation and other potential sources in a typical subtropical watershed (Jiazhuhe watershed) located in the downstream of the Yangtze River of China. The results show that typical crustal elements (Al, Fe) and trace element (Zn) have high seasonal variation patterns and these elements have higher contents in precipitation as compared to other metals in Jiazhuhe watershed. In addition, there is no observed Pb in base flow in this study, and the concentration magnitudes of Al, Ba, Fe, Mn, Sr, and Zn in base flow are significantly higher than that of other metals. During different rainfall events, the dynamic export processes are also different for trace metals. The various trace metals dynamic export processes lead to an inconsistent mass first flush and a significant accumulative variance throughout the rainfall events. It is found that in this region, most of the trace metals in precipitation are from anthropogenic emission and marine aerosols brought by typhoon and monsoon.
为了更好地了解中国等发展中地区的空气污染情况，研究亚热带流域大气痕量金属的湿沉降行为及其来源至关重要。本文研究了位于中国长江下游的典型亚热带流域（夹竹河流域）降水中痕量金属浓度的季节变化以及其他潜在来源。结果表明，典型地壳元素（铝、铁）和痕量元素（锌）具有较高的季节变化模式，与夹竹河流域的其他金属相比，这些元素在降水中的含量更高。此外，本研究中基流中未观测到铅，且基流中铝、钡、铁、锰、锶和锌的浓度显著高于其他金属。在不同降雨事件中，痕量金属的动态输出过程也不同。各种痕量金属的动态输出过程导致降雨事件中质量首冲不一致且累积方差显著。研究发现，该地区降水中的大多数痕量金属来自人为排放以及台风和季风带来的海洋气溶胶。
