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台风纳沙和海棠降水氮湿沉降特征及其来源分析

发表时间:2018-12-29  浏览量:657  下载量:37
全部作者: 胡蝶,朱芸,米宝良
作者单位: 福建师范大学地理科学学院,湿润亚热带山地生态国家重点实验室培育基地;福建师范大学地理研究所
摘 要: 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、莆田和南平三地台风降水的采集和不同形态氮的测定,讨论台风降水过程中氮湿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,溶解性有机氮(dissolved organic nitrogen,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比值的范围为0.88~6.56,表明台风降水氮湿沉降主要来自农业源;福州月尺度降水以NO3-N为主,其NH4+-N/NO3-N比值的范围为0.04~0.84,表明大气氮湿沉降主要来自工业和交通等污染源。就氮湿沉降而言,福州大气降水氮湿沉降通量为16.63 kg•hm2,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湿沉降总量占全年的5.8%. 对纳沙和海棠的降水过程监测显示,不同形态氮的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中氮来源的动态变化特征。
关 键 词: 大气科学;降水;台风;氮湿沉降;特征
Title: Analysis on characteristics and source of nitrogen wet deposition in the precipitation of typhoon Neast and Haitang
Author: HU Die, ZHU Yun, MI Baoliang
Organization: State Key Laboratory of Subtropical Mountain Ecology (Funded by Ministry of Science and Technology and Fujian Province), School of Geographical Sciences, Fujian Normal University; Institution of Geography, Fujian Normal University
Abstract: Concentrations of different forms of nitrogen were measured and precipitation samples were collected from Fuzhou, Putian and Nanping in Fujian province, during Fuzhou precipitation, No.9 typhoon Neast and No.10 typhoon Haitang period in 2017. The dynamic characteristics of nitrogen in typhoon precipitation and its source changes are discussed. The results showed that, the nitrogen composition of precipitation was dominated by inorganic nitrogen, and dissolved organic nitrogen (DON) was below the global average level. The concentration of NH4+-N in typhoon precipitation was higher than that of NO3-N, and the range of NH4+-N/NO3-N value was 0.88-6.56, it showed that the nitrogen wet deposition of typhoon precipitation was mainly from agricultural sources. In contrast, the month precipitation of Fuzhou was dominated by NO3-N, and the range of NH4+-N/NO3-N value was 0.04-0.84, indicating that the main source of atmospheric nitrogen wet deposition resulted from industrial and traffic pollution. In terms of nitrogen wet deposition, the nitrogen wet deposition flux in atmospheric precipitation in Fuzhou was 16.63 kg•hm2, showed marked seasonal differences, which in spring and summer was higher than that in autumn and winter, and the total amount of nitrogen wet deposition 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 concentration appeared regular changes, which presents the characteristics of high to low to high stage change, revealing the dynamic variation characteristics of nitrogen source during typhoon strong precipitation.
Key words: atmospheric sciences; precipitation; typhoon; nitrogen wet deposition; characteristics
发表期数: 2018年12月第24期
引用格式: 胡蝶,朱芸,米宝良. 台风纳沙和海棠降水氮湿沉降特征及其来源分析[J]. 中国科技论文在线精品论文,2018,11(24):2464-2475.
 
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