Seasonal variation and reserves estimation of particulate organic carbon (POC) in the central Bohai Sea

被引：0

作者：

Li, Chun-Chuan ^{[1
,2
]}

Wang, Li-Sha ^{[1
,2
]}

Tang, Hong-Jie ^{[1
,2
]}

Zhang, Hai-Bo ^{[1
,2
]}

机构：

[1] College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao,266100, China

[2] Key Laboratory of Marine Chemistry Theory and Technology/Ministry of Education, Ocean University of China, Qingdao,266100, China

来源：

Zhongguo Huanjing Kexue/China Environmental Science | 2020年 / 40卷 / 05期

关键词：

Barium compounds - Organic carbon - Offshore oil well production - Lakes - Marine biology;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

According to the seasonal investigations in the central Bohai Sea, spatial-temporal characteristics of particulate organic carbon (POC) concentrations, POC pools in the seawater and the possible influencing factors were compared in this study. Results show that the average concentrations of POC in the study area were (338±146)μg/L in spring, (491±136)μg/L in summer, (358±228)μg/L in autumn, and (2534±2601)μg/L in winter. Affected by strong hydrodynamic forces in winter, the average concentration of POC in the study area is about 7times as much as that in spring. During different seasons, POC distributions in the study area show a similar pattern, in which POC contents decreased along the offshore direction. The POC zones with high concentrations were observed along the northern coast of the study area, nearby the Yellow River estuary and Bohai Bay. The distribution patterns of POC were affected by variable factors during the different seasons. In spring, summer and autumn, the distribution of POC was affected mainly by the terrigenous input and phytoplanktonic production. In winter, the distribution of POC was affected majorly by the resuspension of sediments. To trace the source of POC of Bohai Sea, we determined the C/N ratio of samples in different seasons, the results showed that the C/N ratio of 45.3% samples was between 2.6~4.3while 52.8% of the samples was 4~10in spring, the C/N ratio of 38.7% samples was between 2.6~4.3while 32.3% of the samples was 4~10in summer, the C/N ratio of 84.4% samples was between 4~10in autumn, and the C/N ratio of 72% samples was above 12in winter. Consequently the sources of POC in the study area varied seasonally. In spring and summer, POC in the study area mainly came from the metabolic activities of marine organisms. In autumn, the POC mainly came from the phytoplanktonic production. In winter, POC in the study area mainly came from re-suspended sediments with rich organic matters. POC pools in the study area varied seasonally as well. In winter, the POC pool was about 2.5×106t, higher than the values ranging from 6×105t and 7×105t during other seasons. © 2020, Editorial Board of China Environmental Science. All right reserved.

引用

页码：2204 / 2213