夏季南极普里兹湾碳的生物地球化学循环Ⅰ:DOC的含量与分布

本文通过南极第 1 5次科学考察 ,对夏季普里兹湾的溶解有机碳 (DOC)进行研究。结果表明 :调查期间普里兹湾及邻近海域DOC平均含量较高 ,表层含量在 68.2 3- 1 2 5 .92 μM之间变化 ,平均值为 1 0 2 .32 μM ,大于典型的大洋表层DOC含量 ( 70- 80 μM )。垂直分布表明水体上层DOC含量高于底层 ,在 2 5- 5 0m附近含量出现最高值。在普里兹湾及邻近海域难降解有机物是DOC的主要部分 ,经估算湾内难降解DOC含量 92 .34μM占总DOC的 77% ,湾外难降解DOC含量为 76.89μM ,占总DOC的 82 %。

THE BIOGEOCHEMISTRY OF CARBON CYCLE IN SUMMER OF THE PRYDZ BAY, ANTARCTIC Ⅰ: CHARACTERISTICS OF DOC DISTRIBUTION

The distributions and changes of dissolved organic carbon in the Prydz Bay and outer open sea were investigated during CHINARE 15 (the 15th Chinese National Antarctic Research Expendition). The results showed that the content of DOC was higher in the Prydz Bay and outer open sea compared to those typical surface oceanic levels (70—80μM), average content of DOC in the surface water was 102.32μM, the range was 68.23—125.92μM. The vertical distribution of DOC in the water column was similar to many ocean sites, that is to say, the content of upper water is higher than deep water, a subsurface maximum persisted between 25—50m. The DOC pool in the Prydz Bay consisted of labile, semi labile and refractory pools, in which refractory pools was main part. The concentration of refractory DOC was 92.34 and 76.89μM in Prydz Bay and outer open sea, and accounted 77% and 825 for total DOC, respectively.