Temporal and spatial patterns of nitrogen wet deposition in different weather types in the Pearl River Delta (PRD), China
Temporal and spatial patterns of nitrogen wet deposition in different weather types in the Pearl River Delta (PRD), China
复制标题
珠江三角洲不同天气类型氮湿沉降时空格局
DOI：
10.1016/j.scitotenv.2020.139936
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发表时间：
2020
影响因子：
9.8
通讯作者：
Xuemei Wang
中科院分区：
文献类型：
--
作者：
Lianming Zheng;Weihua Chen;Shiguo Jia;Luolin Wu;Buqing Zhong;Wenhui Liao;Ming Chang;Weiwen Wang;Xuemei Wang
研究了珠江三角洲不同天气类型下氮湿沉降的时空分布特征。该研究在2010年至2017年期间在具有可靠气象数据的27个监测点进行。大的空间变异数据表明，无论是体积加权平均（VWM）浓度和通量的高，在珠江三角洲中部地区，而在外围地区较低。年平均浓度和通量分别为0.8-1.3 mg N L− 1和10.9-20.6 kg N ha− 1 yr −1。月平均浓度和通量分别为0.1至0.2 mg N L− 1和0.4至2.4 kg N ha−1。此外，研究数据显示，NH 4 +/NO3−的比值为1.1，远低于北方中国、四川盆地、美国和欧洲等其他地区报告的比值。在城市站点的NH 4+的通量是农村站点相媲美，这意味着潜在的非农业NH3的排放可能是高的珠三角。前三位的天气类型是E，C和SE，总的贡献超过一半的通量。采用多元线性回归方法建立了预测年通量随天气条件变化的方程。结果表明，在未来30年内，珠江三角洲的年通量变化趋于稳定。考虑到对生态系统的影响越来越大，未来应加大力度减少氮湿沉降。
The temporal and spatial patterns of nitrogen wet deposition were investigated in the Pearl River Delta (PRD) under different weather types. The study was carried out in 27 monitoring sites with reliable meteorological data from 2010 to 2017. Large spatial variation data showed that both annual volume weighted mean (VWM) concentrations and fluxes were higher in the central PRD while lower in the outer area. The annual mean concentrations and fluxes were in the range of 0.8–1.3 mg N L−1and 10.9–20.6 kg N ha−1yr−1, respectively. The monthly mean concentrations and fluxes ranged from 0.1 to 0.2 mg N L−1and 0.4 to 2.4 kg N ha−1, respectively. Further the study data revealed that the ratio of NH4+/NO3−was 1.1 which was much lower than the ratio reported in other regions like Northern China, Sichuan Basin, the US and Europe. The flux of NH4+in urban sites was comparable to rural sites, implying that potential non-agricultural NH3emissions were likely to be high in the PRD. The top three weather types were E, C and SE, with the total contribution of more than a half to the flux. Multiple linear regression was used to set up an equation to predict the variation of annual fluxes under the changes in weather conditions. The result hints that the variation on annual fluxes in the PRD tends to be stable in the next 30 years. Considering the increasing impact on the ecosystem, more effort should be exerted to reduce nitrogen wet deposition in the future.