论北京降水的酸性  

On the Precipitation Acidity in Beijing

作　　者：王文兴[1] 张婉华[1] 

机构地区：[1]中国环境科学研究院

出　　处：《环境科学研究》1997年第4期6-9,共4页Research of Environmental Sciences

基　　金：国家"八五"科技攻关项目

摘　　要：１９９４～１９９５年在北京市区安慧里进行了降水观测，分析了降水离子浓度，对夏季典型气象条件下的降水事件进行了后推气流轨迹分析。结果表明，北京市区年降水ｐＨ均值为５左右，夏季ｐＨ值最低，平均为４８８，说明北京出现了酸雨。气流轨迹分析显示，Ｓ－Ｅ扇形方向来流的降水酸度高；Ｎ－Ｗ扇形方面来流的降水酸度低。The precipitation measurements were conducted in Beijing from 1994 to 1996, and back trajectories for typical precipitation were analyzed. Results show that the annual avergage pH of precipitation in Beijing is around 5, the lowest pH is 4.88 in summer. The back trajectories show that the precipitation pH is lowest when the air flows from S-E sector, on the contrary, the pH is highest when the air flows from N-W sector.

关 键 词：降水 酸性 后推气流轨迹 离子浓度 酸雨 北京 

分 类 号：P426.612[天文地球—大气科学及气象学]