毛里塔尼亚海域渔场的环境特征

根据2007年5~8月"中水9505"号调查船在毛里塔尼亚海域(16°00′~20°50′N、16°10′~17°50′W)三个航次的水文调查数据,通过对风场、温度、水文要素(水温、盐度、溶解氧、叶绿素)等的空间分布和变化,以及水团、海流的分析,就海区的海洋结构做了初步研究,并对海洋环境与渔场的关系做了探讨。结果表明:受加那利海流以及赤道暖流的交汇影响,5月到8月,海域的表温逐渐升高,但总体是南部海域的水温高于北部海域;整个海域的盐度基本在27左右;随深度增加,除盐度略有增加外,其他水文要素均明显减小;受海底地形的影响,导致流态以及营养分布不均;中心渔场分别在18°30′~19°10′N、16°10′~16°40′W和19°50′~20°30′N、17°00′~17°30′W两个海域。

The environmental characteristics of fishing ground in the sea area of Mauritania

Tht present paper discourses that the oceanographic structure of the sea area of Mauritania(16°00′-20°50′N、16°10′-17°50′W)has been investigated by means of the space distribution and changes of wind field,temperature,hydrographic factors(water temperature,salinity,DO,chlorophyll) together with the water masses,currents based on the data collected from three cruises of "Zhongshui 9505" fishing vessel during May to August 2007.The relationship between the fishing ground and the oceanographic environment has been herewith discussed.Results showed that the sruface water temperature(SWT) of the sea area mentioned above would gradually rise from May to August owing to receive the interaction of Canary Current and Equatorial Current.But in general,SWT of the southern area was higher than that of the northern.The salinity was about 27‰ in the whole sea area of Mauritania,except the salinity would slightly rise along with the increasing of the depth,other hydrographic factors,values would be reduced.There were two main fishing grounds located at 18°30′-19°10′N、16°10′-16°40′W and 19°50′-20°30′N、17°00′-17°30′W.