摘要
基于东亚酸沉降监测网(EANET)观测数据,结合气象数据和社会经济数据,分析了2008-2020年重庆市降水中电导率、pH值和水溶性离子浓度及沉降量的演变特征和影响因素。结果表明:2008-2020年重庆市降水的pH、电导率、水溶性离子、硫湿沉降通量、硝态氮湿沉降通量和铵态氮湿沉降通量平均值分别为5.33、8.64mS/m、37.03mg/L、2731kg/(km^(2)·a)、273kg/(km^(2)·a)和1748kg/(km^(2)·a)。降水中水溶性离子浓度大小排序为:SO_(4)^(2)>NO_(3)>Ca^(2+)>NH_(4)^(+)>Cl>K^(+)>Mg^(2+)>Na^(+)>F^(-),其中SO_(4)^(2-)、NO_(3)^(-)、Ca^(2+)和NH_(4)^(+)分别占总离子浓度的45.2%、23.9%、13.0%和11.7%。降水污染存在显著的年际和逐月变化,年际变化主要受到污染物排放源的影响,逐月变化则主要受气象条件的影响。2008-2014年强酸性降雨占比(52.37%)较高,降水污染较重;2015-2020年强酸性降雨占比显著降低(3.74%),降水污染显著改善。2008-2010年为硫酸型降水,在2011-2020年为硫酸、硝酸混合型降水。夏季降水较多、大气扩散条件较好,降水中的污染物浓度较低,降水电导率最低,pH最高;冬季反之,降水电导率最高,pH最低。不同水溶性离子浓度占比的逐月变化较小。污染物的浓度对湿沉降通量年际变化的影响要大于降水量的影响,降水量对湿沉降通量逐月变化的影响要大于污染物浓度的影响。
Based on the observations of the East Asian Acid Deposition Monitoring Network(EANET),combined with meteorological and socioeconomic data,the changes and influencing factors of the electrical conductivity(EC),pH,water-soluble ions(WSIs)and wet precipitation fluxes in Chongqing from 2008 to 2020 were analyzed.The results showed that the average values of pH,EC,WSIs,fluxes of sulfur,nitrate-nitrogen,and ammonium-nitrogen in Chongqing wet precipitation during observational periods were 5.33,8.64 mS/m,37.03 mg/L,2731 kg/(km^(2)·a),273 kg/(km^(2)·a)and 1748 kg/(km^(2)·a),respectively.The concentration of WSIs in wet precipitation ranks in the order of SO_(4)^(2)>NO_(3)>Ca^(2+)>NH_(4)^(+)>Cl>K^(+)>Mg^(2+)>Na^(+)>F^(-),among which ions of SO_(4)^(2-)、NO_(3)^(-)、Ca^(2+) and NH_(4)^(+) accounted for 45.2%,23.9%,13.0%and 11.7%of the total ions'concentration,respectively.There were significant inter-annual and monthly variations in pollutants in wet precipitation.Inter-annual variations were mainly affected by pollutant source emissions,while monthly variations were primarily impacted by meteorological conditions.The probability of strong acid rain(52.37%)was relatively high from 2008 to 2014,accompanying stronger pollution.In comparison,strong acid rain occurred significantly less frequently(3.74%)during 2015-2020,and pollution in wet precipitation improved considerably.The wet precipitation in Chongqing from 2008 to 2010 was sulfuric acid type,and from 2011 to 2020,a mixture of sulfuric acid and nitric acid type.In summer,due to the increased amount of wet precipitation and better atmospheric diffusion conditions,the pollutant concentration in wet precipitation was lower with the lowest conductivity and highest pH levels.Conversely,in winter,the conductivity of wet precipitation is the highest,with the lowest pH levels.The monthly variations in the proportions of different WSI concentrations were slight.The impact of pollutant concentrations on the inter-annual variation of pollutant deposition fluxes was more sign
作者
沈利娟
刘常悦
王红磊
刁一伟
施双双
赵天良
SHEN Lijuan;LIU Changyue;WANG Honglei;DIAO Yiwei;SHI Shuangshuang;ZHAO Tianliang(School of Atmosphere and Remote Sensing,Wuxi University,Wuxi Jiangsu 214105,China;China Meteorological Administration Aerosol-Cloud and Precipitation Key Laboratory,Nanjing University of Information Science and Technology,Nanjing 210044,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2024年第5期576-587,共12页
Earth and Environment
基金
国家自然科学基金项目(42275196、41830965)
无锡学院引进人才科研启动专项经费(2023r035)
江苏省自然科学基金项目(BK20231300)。
关键词
重庆
大气降水
酸雨
湿沉降
水溶性离子
时间演变
Chongqing
atmospheric precipitation
acid rain
wet deposition
water-soluble ions
temporal evolution
