夏季南极普里兹湾碳的生物地球化学循环Ⅱ:POC的分布特征

THE BIOGEOCHEMISTRY OF CARBON CYCLE IN SUMMER OF THE PRYDZ BAY,ANTARCTICA Ⅱ:CHARACTERISTICS OF POC DISTRIBUTION

在中国第 1 5次南极考察期间对普里兹湾的颗粒有机碳 (POC)进行了研究。结果表明 :夏季普里兹湾 POC表层含量在 94.2 0 - 1 1 2 4 .0 0μg/L ,平均 2 79.1 1μg/L ,POC含量由湾内向湾外递减。湾内平均含量 5 2 7.1 4μg/L,湾外平均含量 1 71 .72 μg/L,湾内 POC含量远远大于湾外。断面分布表明水体上层 POC含量高于底层含量 ,在 1 0 0 m附近含量达到最低 ,且变化显著。 POC与叶绿素 a的高度相关性 (r=0 .889,n=91 )表明普里兹湾 POC主要由 POCB组成即主要来自于浮游植物的贡献。 POC/chl a值为 1 1 0 .3 3与 Ross海相近 ,但高于太平洋等海域。 POC与DIN、PO4 3 - 之间均呈现良好的负相关 ,相关系数分别为 - 0 .6 0 7、- 0 .486 (n=86 )。

The distribution and content of particulate organic carbon (POC) in Prydz Bay were investigated during CHINARE 15. The results showed that the concentration of POC in the surface layer of Prydz Bay was 94.20-1124.00μg/l,average concentration was 279.11μg/l . The surface POC distribution in summer shows that POC is much higher in Prydz Bay than that out of Prydz Bay. From the POC concentrations with the depth, we can see that the POC content in upper layer is higher than that in bottom, and in 100m the POC content is the highest. POC content has good correlation with chl a ( r=0.889, n=91 ) suggests that POC was mainly from the biological production in the local water columns. The value of POC/chl a in Prydz Bay is higher than that in other areas but similar to the value in Ross Sea. Furthermore there was negative relationship between POC and inorganic nutrient(DIN?PO 3- 4 ), the value of the ' r ' is -0.607 and -0.486( n =86)respectively.