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根据 1998年 5月的调查资料 ,分析并讨论了春季黄海南部海区溶解无机氮的分布特征。结果表明 :( 1)因受长江冲淡水及沿岸流的影响 ,NH+4 - N、NO-2 - N浓度的平面分布基本呈周边高、中央低 ,NO-3 - N的浓度则基本呈长江口外海域高、中北部深水区低的分布规律。 ( 2 )调查海域深水区的溶解无机氮存在明显的层化现象 ,且底层等值线上凸密集。 10 m以浅水体 ,NO-3 - N的浓度分布均匀 ,10 m以深水体 ,NO-3 - N的浓度急剧增加 ,且呈现出随深度增加而增加的趋势 ,NH+4 - N、NO-2 - N浓度的垂直分布比较均匀。 ( 3)黄海南部表层叶绿素 a的浓度呈现周边高、中央低的分布特征。
According to the May 1998 survey data, the distribution characteristics of dissolved inorganic nitrogen in the southern Yellow Sea in spring were analyzed and discussed. The results showed that: (1) Due to the influence of the fresh water and the coastal flow in the Yangtze River, the distribution of NH + 4 - N and NO - 2 - N was basically high in the periphery and low in the center. The concentration of NO 3 - N was basically The distribution pattern of low and deep water areas in the high and mid-north of the Changjiang Estuary. (2) There is obvious stratification of dissolved inorganic nitrogen in the deepwater area of the survey sea area, and the contour lines on the bottom are convex intensively. The concentration of NO 3 - N in the shallow water body was 10 m, the concentration of NO 3 - N was uniform, the concentration of NO 3 - N sharply increased in the depth of 10 m, and showed a trend of increasing with the increase of the depth. The NH 4 -N, NO -2 - N concentration of the vertical distribution of more uniform. (3) The concentration of surface chlorophyll a in the southern part of the Yellow Sea shows the distribution characteristics of high and low central periphery.