黄海南部的溶解无机氮

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。

Dissolved Inorganic Nitrogen in the Southern Yellow Sea

Based on the investigation data from the project “Res earch onthe Dynamic of Seawater Circulation and Mass Long-Term Transportation ”, which was implemented in May 1998, the distribution patterns of dissolved in organic nitrogen (DIN) in the Southern Yellow Sea in May were discussed. The major results could be summarized as (1) The horizontal distribution features of am monia and nitrite show high concentrations in the coastal area and relatively low concentrations in the central area. In the light of the distribution of nitrate, high concentration was identified in the area off the Changjiang River estuary. In the central and northern part of the Southern Yellow Sea, the depth is great and the concentration of nitrate is low. The input of the Changjiang River fr esh water with high concentration nutrients and the alongshore currents should be responsible for the distribution pattern. (2) In the deep-water area, the vertical profiles of DIN stratified obviously. The isopleth of DIN has a significant trend of going up, which is caused by the upwelling Yellow Sea Cold Water. The concentration of nitrate increases from surface to bottom, with a sudden increa se at the 10m layer. (3) The content of chl-a at the surface is high in the alongshore area, but low in the central area.