南极普里兹湾真光层下水体中有机碳和无机碳分解比例的估算

DECOMPOSITION OF ORGANIC CARBON AND INORGANIC CARBON BENEATH EUPHOTIC ZONE IN PRYDZ BAY,ANTARCTICA

本文利用中国第25次南极科学考察数据,运用数学模型对南极普里兹湾有机碳与无机碳的分解比例进行了估算。结果表明:普里兹湾及其邻近海域表层POC的浓度范围为24.38—446.40μg·dm-3,平均值为118.16μg·dm-3,分布趋势呈现湾内高,湾外低的特点。利用简化的数学模型,在普里兹湾P2断面陆架区,上层水体中的有机碳和无机碳向下层水体输出埋藏过程中,两者分解速率比(摩尔比)为1.27,有机质中N、P分解比例为19.29。

As the most important carbon pool in the ocean,particulate organic carbon（POC） plays an important role in marine carbon cycling.During the 25th Chinese National Antarctic Research Expedition（CHINARE-25）,the decomposition ratio of organic carbon and inorganic carbon of Prydz Bay was calculated with a mathematical model.The results showed that the POC concentration of Prydz Bay ranged from 24.38 to 446.40μg ·dm-3,with an average of 118.16μg·dm-3,decreasing offshore.Based on the observed data（dissolved inorganic carbon,dissolved O2 and nutrients）,during the burial processes of organic matter,the ratio of the decompositions of organic carbon and inorganic carbon（mole ratio）was 1.27,and the decomposition ratio of N/P elements was 19.29,at the P2 section on the continental shelf of Prydz Bay.