2013年夏秋季黄海溶解无机氮的分布及季节变化特征

发布时间：2019-04-07 19:35

【摘要】：依据2013年夏季和秋季对黄海海域两个航次的调查结果,对该海域溶解无机氮的季节变化,垂直变化,平面分布状况及其影响因素进行了初步分析和探讨。结果表明,该海域溶解无机氮的分布及组成存在明显的季节性:秋季NO3-N的平均浓度为(7.09±4.15)μmol/dm3,远高于夏季(3.21±3.31)μmol/dm3;夏季NH4-N含量(0.99±0.95)μmol/dm3较秋季(0.79±0.82)μmol/dm3高;夏、秋两个季节溶解无机氮的主要组成部分均为NO3-N,其比例约为70%和90%。受浮游植物生长、海水层化以及黄海冷水团存留的影响,调查海域夏季表层溶解无机氮的浓度较低,底层浓度较高;此外,研究海域表层溶解无机氮的分布明显受陆源输入控制,表层溶解无机氮的整体呈现出近岸高外海低的现象,NH4-N的高值区主要出现在靠近城市的近岸海区。该论文可以为该海域氮盐的海洋化学循环研究及赤潮等有害藻华的预防提供科学的理论依据。
[Abstract]:Based on the investigation results of the two voyages of Huang Hai in summer and autumn of 2013, the seasonal variation, vertical variation, plane distribution and its influencing factors of dissolved inorganic nitrogen in the sea area of Huang Hai were analyzed and discussed. The results show that the distribution and composition of dissolved inorganic nitrogen in the sea area are seasonal: the average concentration of NO3-N in autumn is (7.09 卤4.15) 渭 mol/dm3, which is much higher than that in summer (3.21 卤3.31) 渭 mol/dm3;. The content of NH4-N in summer was (0.99 卤0.95) 渭 mol/dm3 higher than that in autumn (0.79 卤0.82) 渭 mol/dm3, and the main components of dissolved inorganic nitrogen in summer and autumn were both NO3-N, (70% and 90%). Under the influence of phytoplankton growth, sea water stratification and the retention of Huang Hai cold water mass, the concentration of dissolved inorganic nitrogen was lower in the surface layer and higher in the bottom layer of the investigated sea area in summer. In addition, the distribution of dissolved inorganic nitrogen in the surface of the sea area is obviously controlled by the input of land-based sources, and the whole surface dissolved inorganic nitrogen shows the phenomenon of high offshore sea level and low surface dissolved inorganic nitrogen, and the high value area of NH4-N mainly occurs in the coastal area close to the city. This paper can provide a scientific theoretical basis for the study of the ocean chemical cycle of nitrogen and salt and the prevention of harmful algal blooms such as red tide in this sea area.
【作者单位】：中国海洋大学化学化工学院;
【基金】：国家自然科学基金(41376106)
【分类号】：P734.4

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