春、秋季北黄海生源要素的平面分布特征

根据春季和秋季对北黄海2个航次的调查数据,分析了北黄海春秋两季节生源要素的平面分布特征,并简要讨论了其成因.结果表明:(1) 春季北黄海DIN,PO4-P,SiO3-Si的平均浓度分别为(3.46±2.66),(0.18±0.17)和(3.29±3.06)μmol·dm-3,含量较低;到秋季则分别升高至(6.45±3.64),(0.40±0.24)和(7.64±3.84)μmol·dm-3;DO则表现出了相反的变化,秋季较低,春季为秋季的1.42倍.(2) 春季DIN,PO4-P,SiO3-Si在各个层次的分布趋势较为类似,表层和10 m层表现为北黄海中部低,近岸较高,30 m层以下则在冷水团盘踞区及海域东部有高值.DO表层和10 m层变化趋势不显著,但在30 m以下表现出与营养盐相反的分布规律.秋季,DIN,PO4-P,SiO3-Si在各个层次分别具有相同的分布趋势,表层和10 m层表现为北黄海中部低,近岸较高,30 m层以下则在冷水团盘踞区含量较高.而DO由表到底都表现出与营养盐相反的趋势.

The Horizontal Distribution of Biogenic Elements in Spring and Autumn of North Yellow Sea

Based on the two cruises carried out in spring and autumn in the North Yellow Sea, the horizontal distribution of biogenic elements and its causes were disscussed. Results were as follows: (1) The concentration of nutrients in spring was at a low level when the mean value of DIN, PO4-P, SiO3-Si were respectively(3.46±2.66),(0.18±0.17) and(3.29±3.06)μmol·dm-3, which increased to(6.45±3.64), (0.40±0.24) and(7.64±3.84)μmol·dm-3 in autumn. On the contrary, the mean valve of DO was 1.42 times in spring than that in autumn. (2) In spring, DIN, PO4-P, SiO3-Si had similar patterns in each layer, which the value was high in coastal area but low in offshore area in the surface and the 10 m layer. There was high nutrients concentration in the cold water mass area and the east area of the North Yellow Sea. DO didn't change significantly in the surface and 10 m layer while it had opposite distribution with nutrients in the 30 m layer and the bottom. In autumn, DIN, PO4-P, SiO3-Si had similar patterns in each layer, which was the same as these were in spring in the surface and the 10 m layer, while these were high below 30 m layer in the cold water mass area. But DO displayed contrary tendency with nutrients from the surface to the bottom.