冬季黄东海溶解有机碳的分布特征

于2007-01-02对黄东海溶解有机碳(DOC)进行采样并用高温催化氧化法进行测定,分析了其质量浓度和平面分布特征。结果表明,DOC的质量浓度范围为0.440～2.491mg/L,平均质量浓度为(0.967±0.284)mg/L;DOC的平面分布呈现近岸高外海低的特征,近岸高值主要集中在长江口以南海域,主要受陆源输入的影响;外海DOC高值区主要集中在28°N以南,126°E以西的海域,来源于浮游植物的初级生产;东海东南部为DOC的低值区,主要受贫营养的黑潮水控制。垂直方向上,DOC由表到底变化较小,表层和10m层受生物活动影响质量浓度相对较高,底层高值主要来自于沉积物再悬浮的作用。

Distribution of Dissolved Organic Carbon in the Yellow Sea and East China Sea in Winter

Dissolved Organic Carbon(DOC) was collected during January and February in 2007 in the Yellow Sea and East China Sea.DOC concentration was determined by high temperature catalytic oxidation(HTCO) method and the horizontal distribution of DOC was studied.The results showed that the concentration of DOC ranged from 0.440 to 2.491 mg/L and the average concentration was(0.967±0.284) mg/L.The horizontal distribution showed that the highest DOC content was in the coastal area and it tended to decrease in the offshore region.The high DOC value was in the southern part of Yangtze River Estuary which was mainly affected by the terrestrial inputs.The high values of DOC in open sea were mainly found in an area between southern of 28°N and western of 126°E,and were mainly from the primary production of phytoplankton.The lowest value was mainly in the southeast part of East China Sea because of the influence of oligotrophic Kuroshio.In vertical distribution,the change of DOC was smaller from surface to bottom,its concentration in both surface and 10m layers were relatively high because of the effect of biological activity,the high value of bottom layer was mainly from the sediment resuspension.