巴士海峡水文特征的差异分析

Hydrographic character analysis in Bashi Channel

利用1965～1967年黑潮联合调查（CSK）温盐资料分析巴士海峡的水文特征，结果表明：海峡两侧的水文特征存在明显差异，其东侧的太平洋水具有高温高盐特征；西坝的南海水为高温低盐。依据200m层等温线的分布趋势，黑潮水只出现在该海区约120°～121°E以东海域而没有向西扩展，16℃等温线可视为该海区黑潮西边界的概略位置。在海峡500m以线的北端是以太平洋水进入南海；南端在约20°30′N以南是南海水流入太平洋。文中对各种差异的原因进行了讨论。

The characters of waters are different,according to the analysis of CSK temperature and salinity data on the eastand west of the Bashi Channel. The water mass in the east of the Channel is the Pacific water of high tempcrature and high salinity and that in the west the South China Sea Water of high temperature but low salinity. According to the isothermal distribution above 200m, the Kuroshio water only appears in waters to the east of 120°~ 121°E, without extending to the west and therefore the isothermal line of 16℃ may probaly regarded as the western boundary line of the Kuroshio in the waters of the Bashi Channel.According to the isothermal distribution above 500m, the Pacific water invades the South China Sea at the north of the Channel and the South China Sea water outflows to the Pacific at the south of the Channel,namely south to 20°30′ N. This paper discusses the causes of the various differences in hydrographic characters in the Bashi Channel.