冬季黄东海颗粒有机碳的时空分布特征

根据2007年1～2月对黄东海大面调查的资料,分析研究了黄东海颗粒有机碳(POC)的时空分布特征。结果表明,冬季黄东海POC的浓度范围是2.49～1 658.96μg/L,平均浓度为125.88μg/L。在垂直方向上,POC由上而下随着水深的增加浓度逐渐降低,到底层后浓度又升高。在平面分布上,POC整体上呈现西部近岸浓度较高、东部离岸浓度较低的特点;POC的高值区集中在浙江近岸海区,特别是浙江舟山群岛南部近海,POC浓度非常高,这是受陆源输入和沉积物再悬浮的共同作用。在周日变化上,受潮汐作用和海区生物活动的影响,东海陆架中部海域除底层以外,其它各层POC在午后、傍晚、凌晨出现浓度的高峰值,而西南海域,除了底层外,其它各层均表现出全日周期变化。

Spatial and temporal distribution of particulate organic carbon in the Yellow Sea and the East China Sea in winter

Based on the data from the cruises that were carried out in the Yellow Sea and East China Sea from Jan to Feb,2007,the spatial and temporal distributions of particulate organic carbon(POC) were analyzed.The results showed that the concentration of POC in the Yellow Sea and the East China Sea ranged from 2.49 μg/L to 1 658.96 μg/L in spring and the average content was 125.88 μg/L.In vertical orientation with the increase of water depth,POC concentration reduced gradually except the bottom layer.In horizontal distribution,higher POC content appeared in the western coastal zones and decreased toward the far eastern shore.The highest concentration of POC appeared in the coastal waters of Zhejiang Province.Especially the POC in the southern coastal zones of Zhoushan islands both in surface layer and bottom layer were of high content,which was mainly affected by the joint effect of terrestrial inputs and re-suspension of sediments.Under the influence of tides and biological activity,the diurnal change of POC in the middle of the East China Sea was higher at afternoon,dusk and the early morning than other time.However,in the southwest zones POC showed the full-cycle variation excluding the bottom layer.