琼海沿岸上升流及其与渔场的关系

On relation between upwelling off Qionghai and fishery

根据海洋水文调查和海洋站资料分析了海南岛琼海沿岸上升流及其与渔场的关系。结果表明，上升流发生在4～9月，6、7月最强，出现范围在18°30’～20°N，111°30’E以西近岸，其强度各年不一，1978年较弱。西南季风的作用是上升流产生的主要物理机制，估算的流速为4．51×10（－3）m／s。上升流位置大约在清澜渔汛的传统渔场作业区，该区竹鱼、鲐鱼、蓝圆等鱼类的渔获量较高。

Based on the hydrologic featuces and the date from the ocean stations, this paperanalyzes the upwelling off the coastal Qionghia sea of Hainan Province. It states the course ofthe occurence of the upwelling and the physical mechanism,and estimates the speed of theupwelling. The paper also discusses the relation between the upwelling and the fishery incombination with the relevant biological and fishery data. The results prove that theupwelling usually occurs in the area of 18°30’, ~20°N, 111°30’E west off the coast between Apriland September,the upwelling is the strongest in June and July. Its intensity varies indifferent years. The upwelling was a little weak in 1978. The principal physical mechanism of theupwelling comes from the effect of the southwest monsoom, which has an estimated speed of4. 51 ×10（-3）cm/s. The upwelling locates in almost the same water of the traditional fishingground withe is a relatively high catch of Trachurus japonicus, Pneumatophorus japonicus,Decapterus maruadsi and so on.