摘要
2004年9月18—10月4日调查了南海东北部海水中氧化亚氮(N2O)浓度。表层海水中的N2O浓度平均值为8.40±0.79 nmol.L-1,饱和度平均为123%±11.6%,是大气N2O的源。不同区域表层海水中的N2O浓度存在明显差异,在水深200m层呈现南高、北低的分布特征。各层次海水中的N2O浓度均处于过饱和状态,N2O浓度由海水表层到底层呈上升趋势。ΔN2O与AOU间有显著的正线性相关性,说明海洋内部的硝化作用是产生N2O的主要机制。N2O的海-气通量平均值为0.72±0.36μmol.(m2.d)-1。
The concentration of seawater nitrous oxide was investigated in the northeastern South China Sea during Sep. 18-24, 2004. The average concentration of N2O in the surface seawater was 8.40±0.79 nmol ·L ^-1 , with a saturation of 123%±11.6%. This area was found to be one of the sources which release N2O into the atmosphere. The concentration of N2O showed obvious differences both horizontally and vertically, even down to the depth of 200m layer. All the seawater layers were saturated with N2O, and the vertical profile of N2O concentration indicated an increasing trend toward the bottom. The correlation between AN2O and AOU was notably positive, suggesting that nitrification might be a major mechanism of N2O formation in the sea. The average N2O flux between air and sea was determined to be 0.72± 0.36μmol. （m2· d）^-1.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2006年第4期66-74,共9页
Journal of Tropical Oceanography
基金
中国科学院知识创新工程重要方向项目(KZCX3-SW-214和KZSX2-SW-132)
广东省自然科学基金项目(032622)
中国科学院南海海洋研究所领域前沿项目(LYQY200303)
关键词
南海北部
氧化亚氮
分布
机制
通量
South China Sea
nitrous oxide
formation
distribution
flux
