南沙群岛海域次表层溶解氧垂直分布最大值的强度特征  

INTENSITY OF VERTICALLY DISTRIBUTED MAXIMUM DO IN NANSHA ISLANDS SEA AREA

作　　者：林洪瑛[1] 程赛伟[1] 韩舞鹰[1] 王汉奎[1] 

机构地区：[1]中国科学院南海海洋研究所,广州510301

出　　处：《热带海洋学报》2003年第3期9-15,共7页Journal of Tropical Oceanography

基　　金：九五"国家科技攻关项目(97926 0401)

摘　　要：分析了"八五"、"九五"国家科技专项南沙群岛海域综合科学考察的现场调查资料,对南沙群岛海域次表层存在的溶解氧垂直分布最大值现象提出了定量表征其强度的方法,并依此法对溶解氧垂直分布最大值强度的特征、季节变化、区域分布等进行了分析。结果表明,南沙群岛海域海水中的溶解氧垂直分布最大值强度在不同的海区、不同的季节表现不同。南沙群岛海区四季均有明显的溶解氧最大值现象出现,就平均值而言,春、夏、冬季次表层溶解氧垂直分布最大值现象较为明显,秋季相对较弱;春季溶解氧垂直分布最大值强度的高值出现在西南部海区和北部的珊瑚礁区,与季风过渡期海水溶解氧主要受生物作用相对应;冬、夏季较高的溶解氧垂直分布最大强度值分别出现在西北部和西部,对应于季风盛行时期的南沙西部沿岸流;夏季出现在东部和南部的低值区又与南沙群岛海区西南季风时期出现的南沙逆流相对应。定量表征的结果与该海区调查研究的分析结果相符合,同时又较好地反映了该海域在季风作用下的物理和生物过程。Based on the observation data from four cruises in Nansha Islands sea area from May to June of 1990, in December of 1993, from September to October of 1994, and in July of 1999 respectively, a method to quantify the intensity of maximum dissolved oxygen was put forward, and its feature, seasonal variation and regional distribution were discussed in this paper. The results showed that, intensity distributions of maximum dissolved oxygen differed in different sea areas and different seasons. On average, the maximum dissolved oxygen in the subsurface layer was relatively higher in spring, summer and winter than in autumn. In spring, high intensity values of maximum dissolved oxygen occurred in the southwest and northern coral reefs of Nansha Islands sea area, in accord with the high biological productivity during the monsoon transition; while in winter and summer, occurred in the northwest and the west, in accord with the action of western coastal current during the monsoon prevailing period. The region with low values in the eastern and southern Nansha Islands sea area during summer was corresponding to the Nansha countercurrent during the prevailing period of southwest monsoon. The above results were accordant with the field investigation results, showing a close relationship of maximum dissolved oxygen to the upper layer circulation, and can also reflect the biological action in the Nansha Islands sea area.

关 键 词：南沙群岛海域 溶解氧 强度 

分 类 号：P714.4[天文地球—海洋科学]