台湾海峡中、北部海域温、盐度特征

台湾海峡中、北部海域海水温、盐度分布随季风进退而异。东北季风期(10月—翌年5月),进入调查海域的浙闽沿岸水(低温、低盐)顺海域西岸海区南下的同时,在海坛岛外有一分支向东南扩展,其扩展范围随浙闽沿岸水强弱而异,而且在24°30′N,119°30′E附近有海峡暖流水(高温、高盐)向北伸展,它随西南风增强而向北推移。海域温、盐度值自西北向东南递增。西南季风期(6—9月),调查海域基本上为海峡暖流水所控制。在6—8月,海域西岸海区有上升流产生,上升流中心在海坛岛附近。海域盐度值自西北向东南递增,而温度分布趋势与盐度分布相反。 温、盐度的垂直分布大致分均匀型、正梯度型和负梯度型三类。

CHARACTERISTICS OF WATER TEMPERATURE AND SALINITY IN NORTH CENTRAL TAIWAN STRAIT

Distribution of water temperature and salinity varies with monsoons in north central Taiwan strait. At the period of mortheast wind(from Oct. to next May), when the Zhemin coastal current(low temperature and low salinity) flows southward along the west coast, the current branch outside Haitan Island expands southeastward, varying in range with the intensity of the Zhemin coastal current. In the area 24°30'N, 119°30'E, a strait warm current(high temperature and high salinity) stretches northward under the influence of southwest wind. Its temperature and salinity increase from northwest to southeast. At the period of southwest wing(from June to Sept.) the surveyed area are essentially dominated by the strait's warm current. From June to August an upwelling occurs at the waters of west coast, its centure being in the vicinity of Haitan Island. The salinity of this waters reduces, yet its temperature rises, from northwest to southeast.