青岛大气氮干湿沉降特征  

Characteristics of Dry and Bulk Deposition of Atmospheric Nitrogen in Qingdao

作　　者：房增国[1] 晁会珍 赵秀芬[1] FANG Zengguo;CHAO Huizhen;ZHAO Xiufen(College of Resource and Environment,Qingdao Agricultural University,Qingdao 266109,China;College of Resource and Environment Science,Nanjing Agricultural University,Nanjing 210095,China)

机构地区：[1]青岛农业大学资源与环境学院,山东青岛266109 [2]南京农业大学资源与环境科学学院,江苏南京210095

出　　处：《环境科学与技术》2021年第11期10-17,共8页Environmental Science & Technology

基　　金：山东省大型科学仪器设备升级改造技术研究项目(2012SJGZ14);青岛农业大学项目(620986,661-1116014)。

摘　　要：该研究利用雨量器和被动采样器定点采集降水和气体样品的方法,研究了青岛市城阳区2015-2019年间降水及干沉降中不同形态氮浓度、氮沉降量的月、季动态变化特征,并分析比较了年际间大气氮沉降量的特点。结果表明:监测期内青岛区域NH_(3)-N、NO_(2)-N、NH_(4)^(+)-N和NO_(3)^(-)-N的年均浓度依次为10.9μg/m^(3)、10.1μg/m^(3)、1.23 mg/L和1.07 mg/L;NH_(3)-N浓度除6-7月份较高外,其他月份间以及1-12月NO_(2)-N浓度均变幅较小,NH_(4)^(+)-N和NO_(3)^(-)-N浓度变化趋势基本一致,8月份浓度最低;NH_(4)^(+)-N浓度表现为冬季最高,夏季最低,NH_(3)-N浓度则相反,NO_(3)^(-)-N和NO_(2)-N浓度均是冬春秋季较高,夏季最低。监测期内青岛NH_(3)-N、NO_(2)-N、NH_(4)^(+)-N和NO_(3)^(-)-N年均沉降量分别是15.68、5.05、6.51和5.64 kg/hm^(2);1-12月的NO_(2)-N沉降量变幅较小,而1-12月NH_(3)-N以及降水中NH_(4)^(+)-N和NO_(3)^(-)-N沉降量则呈抛物线变化,干湿/混合沉降峰值分别在7月和8月;各季度NH_(3)-N沉降量均显著高于NO_(2)-N沉降量,且NH_(3)-N沉降量表现为夏季最高,冬季最低,NO_(2)-N则是秋季最高,冬季最低;NH_(4)^(+)-N和NO_(3)^(-)-N沉降量均是夏季最高,冬季最低,其夏季沉降量占各自形态全年沉降量的53.5%和46.5%。监测期内青岛大气氮干湿/混合沉降的范围分别为17.45~27.34 kg/(hm^(2)·a)和7.41~16.75 kg/(hm^(2)·a),年均沉降量则分别为20.73 kg/hm^(2)和12.16 kg/hm^(2),干沉降占总沉降量的62.9%。This study conducted a full five-year(2015-2019)measurement of dry and bulk deposition of atmospheric inor?ganic nitrogen(N)in Qingdao.Dry N deposition fluxes were calculated by multiplying the atmospheric concentrations of NH_(3)and NO_(2) measured using passive samplers with the modeled dry deposition velocities provided by the GEOS-Chem global chemical transport model,while bulk N deposition fluxes were measured using precipitation gauge.The results showed that annual concentrations of NH_(3)-N,NO_(2)-N,NH_(4)^(+)-N and NO_(3)^(-)-N at Chengyang of Qingdao during the monitoring period averaged 10.9μg/m^(3),10.1μg/m^(3),1.23 mg/L and 1.07 mg/L,respectively.Both NH_(3)-N concentration of other months and NO_(2)-N concentration from January to December had a little variation range,except that NH_(3)-N concentration from June to July was higher.Both NH_(4)^(+)-N concentration and NO_(3)^(-)-N concentration was the lowest in August,and their variation trends were similar.NH_(4)^(+)-N concentration was the highest in winter and the lowest in summer,but NH_(3)-N concentration was on the opposite.Both NO_(3)^(-)-N concentration and NO_(2)-N concentration behaved the higher in winter,spring and autumn,and the lower value was found in summer.Annual deposition fluxes of NH_(3)-N,NO_(2)-N,NH_(4)^(+)-N and NO_(3)^(-)-N in Qingdao in 2015-2019 averaged 15.68 kg/hm^(2),5.05 kg/hm^(2),6.51 kg/hm^(2)and 5.64 kg/hm^(2),respectively.The deposition of NO_(2)-N changed little from January to December.From January to December,dry deposition of NH_(3)-N and bulk deposition of NH_(4)^(+)-N and NO_(3)^(-)-N in precipitation changed according to a parabolic curve with the peak at July and August,respectively.NH_(3)-N deposition was significantly greater than NO_(2)-N deposition in all seasons.The deposition of all nitrogen species had an obvious seasonal change,and NO_(2)-N deposition behaved higher in autumn and lower in winter,the deposition of NH_(3)-N,NH_(4)^(+)-N and NO_(3)^(-)-N behaved higher in summer and lower in winter.The

关 键 词：青岛 降水 大气氮 湿沉降 干沉降 

分 类 号：X51[环境科学与工程—环境工程]