东海冬季环流中溶解氧和营养盐分布特征

DISTRIBUTION OF DISSOLVED OXYGEN AND NUTRIENTS IN WINTER CIRCULATION IN EAST CHINA SEA

利用1905年1～2月份断面调查资料,探讨了东海环流中溶解氧和营养盐的空间分布,并进一步分析了与物理参数的关系。结果表明:溶解氧和营养盐分布特征与冬季形成的东海环流系统有关,而且不同物理特性水团显示了不同含量。因此,当不同理化特性的水团交汇时形成了强的浓度梯度。溶解氧和硝酸盐与温、盐存在着良好的线性关系,但是有迹象表明沿岸水团受气象条件影响较强,而营养盐受理化、生物等过程影响比氧更复杂,最后计算了测区4种水团中的N:P原子比,结果发现各类水团的N:P比差异较大。

Based on the section-survey data in January and February, 1985, the spatial distribution of dissolved oxygen (DO) and nutrients in the winter circulation in the East China Sea is analysed in relation to certain physical parameters of the water. It is found that DO and nutrients' contents were connected with the physical properties of the water masses. So large ranges of concentration gradient were formed where the water masses displaying different properties met. Water masses alongshore were subject to the influence of the meterological factors. The atomic ratios of N to P of the four water masses in the surveyed region are calculated and considerable discrepancies are found among the results.