中国鲁西南地区大气氮硫湿沉降特征研究

Study on Characteristics of Nitrogen and Sulfur in Wet Deposition in Southwest of Shandong Province

对2016年-2020年鲁西南核心区菏泽市两个湿沉降监测点位N、S湿沉降量进行了连续监测,考察了其年际、季节变化特征以及与大气中NO_(2)、SO_(2)、PM_(10)、PM_(2.5)之间的关系。结果表明该地区N、S湿沉降量年际差异明显,在调查时间段内,N、S的沉降量均在2018年达到顶峰,分别为18.47 kg/hm^(2)和21.37 kg/hm^(2)。NH^(+)_(4)-N、NO^(-)_(3)-N、SO^(2-)_(4)-S湿沉降量的季节变化具有较强规律性变化特征,均在夏季达到最高,其在全年沉降量中的占比分别达到46.2%~76.3%、39.8%~59.7%、48.4%~70.7%。NH^(+)_(4)、NO^(-)_(3)、SO_(2)-4浓度均与空气中PM_(10)、PM_(2.5)浓度有一定正相关性,NO-3还与空气中NO_(2)正相关。

A continuous investigation of nitrogen and sulfur wet deposition was conducted to analyze their annual and seasonal characteristics and correlation with atmospheric polluted factors in Heze city,the core area of Southwest of Shandong Province in five-year period(from 2016 to 2020).The results showed that there was an obvious difference between the deposition of nitrogen and sulfur in precipitation.During the investigated period,the wet deposition of nitrogen and sulfur reached the peak with 18.47 kg/hm^(2) and 21.37 kg/hm^(2) respectively in 2018.The seasonal wet deposition of ammonium nitrogen,nitrate nitrogen and sulfate sulfur had a regular change and all reached the peaks in summer with the ratio in total annual deposition varying from 46.2%to 76.3%,from 39.8%to 59.7%and from 48.4%to 70.7%,respectively.There were positive correlations between NH^(+)_(4),NO^(-)_(3),SO^(2-)_(4) in wet deposition and PM_(10),PM_(2.5) in atmosphere.In addition,there was a certain positive correlation between NO^(-)_(3) and NO_(2) in atmosphere.