It has become general for surface waters being polluted by micro organic compounds. In order to know the current pollution situation and the properties of micro organic compounds in the Changjiang River, a test was pe...It has become general for surface waters being polluted by micro organic compounds. In order to know the current pollution situation and the properties of micro organic compounds in the Changjiang River, a test was performed on micro organic compounds in the water, bottom material and fish bodies which were sampled from major city river reaches of the Changjiang River. Based on the test result, researchers described and analyzed the sorts, concentration level and distribution features of micro organic compounds. A comprehensive evaluation was conducted by adopting the method of MEG (Multimedia Environmental Goals). The study indicated that ① the water body of major city river reaches of the Changjiang River has been generally polluted. In the test, totally 12 types with 308 kinds of organic compounds were detected. The main pollutants were paraffins, PAHs and lipids; and ② micro organic pollutant content in fish bodies was generally higher than that in bottom material which is in turn higher than that in water; and ③ pollution is relatively severe in the river reaches of mid-to-large comprehensive industrial cities with fairly great TAS (Total Ambient Severity) of public health and ecological system.展开更多
文摘It has become general for surface waters being polluted by micro organic compounds. In order to know the current pollution situation and the properties of micro organic compounds in the Changjiang River, a test was performed on micro organic compounds in the water, bottom material and fish bodies which were sampled from major city river reaches of the Changjiang River. Based on the test result, researchers described and analyzed the sorts, concentration level and distribution features of micro organic compounds. A comprehensive evaluation was conducted by adopting the method of MEG (Multimedia Environmental Goals). The study indicated that ① the water body of major city river reaches of the Changjiang River has been generally polluted. In the test, totally 12 types with 308 kinds of organic compounds were detected. The main pollutants were paraffins, PAHs and lipids; and ② micro organic pollutant content in fish bodies was generally higher than that in bottom material which is in turn higher than that in water; and ③ pollution is relatively severe in the river reaches of mid-to-large comprehensive industrial cities with fairly great TAS (Total Ambient Severity) of public health and ecological system.
文摘挥发性有机物VOCs (Volatile Organic Compounds)是对流层O_(3)以及二次细颗粒物(PM_(2.5),Fine Particulate Matter)的重要前体物,资料同化系统对VOCs浓度及源排放的处理策略会显著影响空气污染物预报的准确性.提出了一种基于相关性的VOCs指数,用于定量筛选资料同化过程中由观测数据更新的VOCs模式变量及源排放清单项.采用WRF-Chem (Weather Research and Forecasting model coupled with Chemistry)模式以及EnSRF (Ensemble Square Root Filter)资料同化算法,针对2022年7-8月长三角地区极端高温事件进行了个例分析,结果表明:在源排放反演上,通过VOCs指数筛选更新变量,后验总VOCs源排放具有与O_(3)观测相似的日间峰值,这样的日间峰值使该模式能更好地修正其对O_(3)预报偏低的系统性误差;在对O_(3)和PM_(2.5)的预报中,通过VOCs指数筛选更新变量的同化策略的表现最优,与未进行更新变量筛选的同化策略相比,其72 h预报的均方根误差分别下降了5.5%和7.2%.
