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基于2006～2007年4个季度月的现场调查资料,研究了南黄海冷水域35°N断面化学水文学特征及营养盐的季节变化.结果表明,冬季,黄海暖流明显影响着断面东侧的水文状况,且垂直混合作用在深水域并未到达海底,使各要素在断面东西侧呈现出不同的分布状况,其西侧呈上下均匀分布,而东侧则表现为上层的垂直均匀分布状态和下层的梯度分布状态;春季,黄海暖流残留水的存在和青岛冷水团的出现是该断面上最显著的水文特征,上层海水增温和垂直对流作用的减弱也使水体稳定性逐渐增强,与冬季相比,断面深水域DO、pH和各营养盐等值线走势更趋于转向水平方向,且随“春华期”的到来,上层水体中的营养盐浓度较冬季也明显下降,并开始出现次表层叶绿素最大值现象;夏季,水体层化结构清晰,断面上存在强大的温跃层及黄海冷水团,并伴随有DO最大值和pH最大值现象,各项营养盐均呈上层低、下层高的趋势,且上层水体中的营养盐浓度较春季时又进一步降低,而跃层以下水体中的营养盐浓度较春季时则有明显升高;秋季,海面降温及垂直对流作用的加强使水体稳定性降低,但深水域水体的垂直交换依然不畅,且断面东侧下层水体中各项营养盐浓度比夏季有明显升高.本研究进一步揭示了混合和层化等主要物理过程对各要素垂向分布及其季节变化规律的影响机制.
Based on the field survey data of 4 quarters from 2006 to 2007, the chemical and hydrographic characteristics of 35 ° N section and the seasonal variation of nutrients in the cold waters of the southern Yellow Sea were studied. The results show that in winter, the warm current of the Yellow Sea obviously affects the hydrology And the vertical mixing did not reach the seafloor in the deep water so that the various elements showed different distributions on the east and west sides of the section with a uniform distribution up and down on the west side and a vertically uniform distribution on the east side and the lower level In the spring, the presence of residual water from the Yellow Sea warm water and the appearance of the cold water mass in Qingdao are the most significant hydrological features in this section. The warming of the upper seawater and the weakening of the vertical convection also increased the stability of the water body. The trend of DO, pH and nutrient value contours in the deep-water section of the section tended to turn towards the horizontal direction. With the advent of the “Spring Festival”, the nutrient concentrations in the upper water bodies also dropped significantly compared with those in the winter and started The phenomenon of subsurface chlorophyll maximum appeared. In summer, the stratigraphic structure of water body was clear, and there was a strong thermocline and the Yellow Sea cold water mass on the cross section accompanied by the phenomenon of DO maximum and pH maximum. The nutrients in the upper water bodies were lower than those in the spring, while the nutrient concentrations in the water bodies below the thermocline were significantly higher than those in the spring. In autumn, the sea surface temperature was decreased And the vertical convection enhanced the stability of the water body to reduce, but the vertical exchange of the deep water body was still sluggish, and the nutrient concentration in the lower part of the eastern section of the section was significantly higher than that in summer.This study further revealed that the mixing and layer And other major physical processes on the vertical distribution of the factors and seasonal changes in the mechanism of influence.