摘要
本文根据国家海洋局1983年9月—1985年1月在南海中部海区的综合调查资料,分析了该海区溶解氧的垂直结构特征和氧最小值的分布变化规律。结果表明,在水深500m至1000或1500m处终年存在着氧含量普遍小于2.0×10^(-3)的氧最小层,其厚度南部高于北部。氧最小值的含量在(1.65—2.10)×10^(-3)之间,其量值也明显地随着纬度而增加。文中还对氧最小层形成的机理作了初步探讨。
Based on the survey data of the central area of the South China Sea from September 1983 to January 1985, the vertical structure characteristic of dissolved oxygen and the distribution of oxygen minimum values are studied. It is shown that minimum layers with dissolved oxygen content of less than 2.0×10-3 appear at intermediate depth (from 500 to 1000 or 1 500m) in this area. Its thickness in the south part of this area is larger than that in the north. The oxygen minimum values of dissolved oxygen vertical distribution range from 1.65×10-3 to 2.10×10-3. Its values increase with the latitude. The mechanism of the formation and maintenance of a state of oxygen minimum layers is preliminarily discussed in this paper. It is concluded that downward diffusive rate of dissolved oxygen from surface, oxidation rate of sinking organic matter, existence of pycnocline in all seasons and supply of oxygen by deep water inflow from the Pacific Ocean into South China Sea are the important factors of the formation and maintenance of oxygen minimum layers in the area.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1991年第4期353-359,共7页
Oceanologia Et Limnologia Sinica
