台风“ 纳沙 ” 和 “ 海棠 ” 降水氮沉降特征及其来 源分析
首发时间:2018-10-12
摘要:随着氮湿沉降特征及其环境效应研究的深入,台风降水作为强降水事件,其降水中氮沉降的特征、来源及其动态变化仍然认识不足。通过对2017年福州降水、2017年第9号强台风纳沙和第10号台风海棠活动时段福州、莆田和南平市三地台风降水的采集和不同形态氮的测定,讨论了台风降水过程中氮沉降的动态特征及氮来源变化。结果表明,降水中的氮组成均以无机氮为主,DON低于全球平均水平。台风降水中NH4+-N浓度高于NO3- -N,其NH4+ -N/NO3- -N值范围为0.88~6.56,福州月尺度降水以NO3- -N为主,其NH4+ -N/NO3- -N值范围为0.04~0.84,表明工业和交通等污染源对台风降水中氮的影响较弱。就氮湿沉降而言,福州大气降水氮沉降通量为16.63 kg hm-2,呈现明显的季节性差异,春夏季高于秋冬季,台风纳沙和海棠的氮沉降总量达全年的5.8%。纳沙与海棠降水过程监测显示,不同形态可溶性氮浓度随台风降水过程呈现规律性变化,总体呈现高-低-高的阶段性变化特征,揭示出台风强降水过程氮来源的动态变化特征。
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The characteristics and Source of nitrogen deposition in the precipitation of Typhoon
Abstract:With the deep research on the characteristics of nitrogen wet deposition and its environmental effects, typhoon precipitation as a strong precipitation event, the characteristics, sources and dynamic changes of nitrogen deposition in precipitation are still insufficiently understood. Concentrations of different forms of nitrogen were measured in 2017 Fuzhou precipitation, No.9 Typhoon Neast and No.10 Typhoon Haitang period precipitation samples collected from Fuzhou, Putian and Nanping in Fujian provincThe characteristics and Source of nitrogen deposition in the precipitation of Typhoon "Neast" and "Haitang"e, the dynamic characteristics of nitrogen in typhoon precipitation and its source changes are discussed. The results shows that the nitrogen composition of precipitation is dominated by inorganic nitrogen, The characteristics and Source of nitrogen deposition in the precipitation of Typhoon "Neast" and "Haitang"and DON is lower than the global average. The concentration of NH4+ -N in typhoon precipitation is higher than that of NO3- -N, and the range of NH4- -N/NO3+ -N value is 0.88~6.56. The month precipitation of Fuzhou is dominated by NO3- -N, and the range of NH4+ -N/NO3- -N value is 0.04~0.84. Analysis showed that the effects of industrial and traffic pollution sources on nitrogen in typhoon precipitation are weak. The nitrogen deposition flux in atmospheric precipitation in Fuzhou was 16.63 kg hm-2, showed marked seasonal differences, which in spring and summer was higher than that in autumn and winter, and the total amount of dissolved nitrogen in two typhoons accounted for 5.8% of the whole year. The monitoring of precipitation process in typhoon Neast and Haitang showed that various forms of nitrogen appeared regular changes, which presents the characteristics of high-low-high stage change , revealing the dynamic variation characteristics of nitrogen source during typhoon strong precipitation.
Keywords: typhoons precipitation nitrogen wet deposition
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台风“ 纳沙 ” 和 “ 海棠 ” 降水氮沉降特征及其来 源分析
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