夏季黄渤海生源要素的平面分布特征

Horizontal distribution features of biogenic elements in Bohai Sea and the Yellow Sea in summer

依据2013年6月22日～7月9日对黄渤海海域调查结果，分析了该海域生源要素（DIN、PO4-P、SiO3-Si、DO）的含量及平面分布特征，并初步探讨了莱州湾内连续站P2各项要素的日变化规律及其影响因素。结果表明：夏季DIN含量表现为渤海高于黄海，而DO、PO4-P及Si03-Si却表现出黄海高于渤海的特征。渤海表层DIN、SiO3-Si浓度高于其底层浓度，黄海底层DIN、PO4-P、SiO2-Si浓度高于其表层浓度，渤、黄海表层DO高于底层DO。平面分布上，调查海区营养盐整体呈现南高北低，近岸高、外海低的分布特征。营养盐的高值区主要出现在长江口、黄河入海口及江苏近岸海区以及黄海底层中部海区，其分布受长江冲淡水、黄河水及黄海冷水团的影响明显。DO则呈现北高南低的分布特征，南黄海海区较低，高值区出现在北黄海底层。受黄河冲淡水对该站位的影响，P2连续站营养盐及DO浓度均表现为表层高于10m层、底层，Si03-Si和DIN受潮汐影响较大，其变化规律与盐度基本一致，DO受潮汐与生物共同作用，高值出现在下午16时左右。

Based on the survey carried out from 22 June to 9 July 2013 in the Bohai Sea and the Yellow Sea, the con- centrations and horizontal distribution features of biogenic elements （including DIN, PO4-P and SiO3-Si ） and DO were analyzed, and daily variation patterns and influence factor of parameters of anchor station P2 in Laizhou Bay were preliminary discussed. Results showed that in summer, DIN was higher in the Bohai Sea than in the Yellow Sea, but DO, PO4-P and SiO3-Si were on the contrary. In the Bohai Sea, DIN and SiO3-Si were higher in surface layer than in bottom layer, but they were on the contrary in the Yellow Sea. DO was higher in surface layer than in bottom layer in both the Bohai Sea and the Yellow Sea. Nutrient distributions showed a descending trend from north to south and from coast to offshore. High value area of nutrient mainly appeared in Yangtze River Estuary, Yellow River Estuary, Jiang- su Coast and bottom of central area of the Yellow Sea, their distributions were obviously affected by Yangtze River Di-luted Water, Yellow River Diluted Water and Yellow Sea Cold Water Mass. DO distribution showed a descending trend from north to south. DO was relatively low in the south Yellow Sea and high value area of DO appeared in bot- tom layer in north Yellow Sea. Affected by the Yellow River Diluted Water, nutrients and DO in surface layer of an- chor station P2 were higher than in 10m and bottom layer, SiO3-Si and DIN were significantly affected by tide and their variation patterns were similar with that of salinity. DO was affected by the combined action of tide and biological activities, and it reached maximum value at 1600 hour in the afternoon.