北京市区大气氮沉降研究

2009年3～9月,使用离子交换树脂柱法对北京市区大气氮沉降进行了观测.2009年3～6月,北京市区大气硝态氮沉降平均值为40.59 mg.m-2,大气亚硝态氮沉降平均值为14.66 mg.m-2.2009年6～9月,北京市区大气硝态氮沉降平均值为75.13 mg.m-2,大气亚硝态氮沉降平均值为20.67 mg.m-2.观测表明,大气硝态氮和亚硝态氮沉降有明显的局部分异特点,沉降量大的地点主要是交通干线和热电厂周边地区,显示了大气硝态氮和亚硝态氮的线源和点源特征.2009年3～6月,北京市区大气氨态氮沉降平均值为12.19 mg.m-2.2009年6～9月,北京市区大气氨态氮沉降平均值为8.46 mg.m-2.结果表明,各观测点之间大气氨态氮沉降变化明显小于硝态氮和亚硝态氮,显示了大气氨态氮的非点源特征.

Atmospheric Nitrogen Deposition in Urban Area of Beijing

Using ion exchange resin columns method, atmospheric nitrogen deposition was observed in the urban area of Beijing from March to September in 2009. The average value of atmospheric nitrate nitrogen deposition was 40.59 mg·m^-2 and that of atmospheric sulfite nitrogen deposition was 14.66 mg·m^-2 from March to Jun. The average value of atmospheric nitrate nitrogen deposition was 75.13 mg·m^-2 and that of atmospheric sulfite nitrogen deposition was 20.67 mg·m^-2 from June to September. Observational results show that atmospheric nitrate and sulfite nitrogen deposition had obvious local difference, that is to say, there was relatively large amount of deposition around traffic arteries and power plants, which shows the character of line/point source of atmospheric nitrate and sulfite nitrogen deposition. The average value of atmospheric ammonia nitrogen deposition was 12.19 mg·m^-2 from March to June, and 8.46 mg·m^-2 from June to September. Observational results show that the change of atmospheric ammonia nitrogen deposition among observation points was obvious smaller than atmospheric nitrate and sulfite nitrogen deposition, which shows the character of non-point source of atmospheric ammonia nitrogen deposition.