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湖泊科学  2003 

广州麓湖大气多环芳烃的干湿沉降

DOI: 10.18307/2003.0301

Keywords: 多环芳烃,大气沉降,颗粒物,麓湖

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Abstract:

以广州麓湖为小型城市湖泊的代表,对大气中多环芳烃的颗粒态沉降进行了连续一年的采样与分析.结果表明,年均颗粒态多环芳烃的沉降通量为0.47mg/(m2·a).全年直接由大气输入到麓湖的颗粒态多环芳烃总量约为0.1kg.不同季节相比,夏季多环芳烃的沉降通量略高于秋季,而冬春季最高.对比大气总悬浮颗粒物中多环芳烃的组成发现,当降雨量增大时,沉降颗粒物中多环芳烃的组成逐渐趋近于大气总悬浮物中多环芳烃的组成.广州地区雨热同期、干冷咸至的季风气候特点,以及由此导致的大气颗粒物粒径变化和PAHs的气-粒分配变化,与大气PAHs污染程度一起,共同控制着沉降颗粒物中PAHs相对组成的季节变化.

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