我国西部清洁大气中SO_2和NO_2的观测和分析

OBSERVATION AND ANALYSIS OF SO 2 AND NO 2 IN CLEAN AIR OF WESTERN CHINA

在我国青海省瓦里关大气本底基准观象台（海拔３８１０ｍ，１００°５４′Ｅ，３６°１７′Ｎ），利用浸渍膜法采集大气中的ＳＯ２和ＮＯ２，使用离子色谱分析其浓度。１９９４年８月至１９９５年７月的测量结果表明，ＳＯ２和ＮＯ２的平均浓度分别为０．１４７×１０－９和０．０５５×１０－９，ＳＯ２和ＮＯ２两者具有较好的相关性，其相关系数ｒ＝０．８７，它们的平均比值为２．６左右．ＳＯ２和ＮＯ２的浓度受季节和风向的影响，偏东风时浓度较高，偏西风时浓度较低．冬季ＳＯ２和ＮＯ２的浓度水平较低。

Atmospheric SO 2 and NO 2 were sampled during the period from August 1994 to July 1995 by using filter packs (FP) method, and the concentrations of these gases were analysed with ion chromatography (IC) at Waliguan backgroud baseline station (3810 m asl, 100°54′E, 36°17′N) of Qinghai Province, western China. It is found that the average concentrations of SO 2 and NO 2 are 0.147×10 -9 and 0.055×10 -9 , respectively. There is a good correlation between SO 2 and NO 2 concentrations with a coefficient of 0.87, the ratio of SO 2 to NO 2 derived from the linear regression is about 2.6. Furthermore, the concentrations of SO 2 and NO 2 vary with seasons and wind directions. Higher concentrations are from easterly, and lower from westerly. The concentrations of SO 2 and NO 2 are lower in winter season and higher in summer.