长江口外及毗邻海域盐度的时空变化特征

Characteristics of Temporal and Spatial Variations of Salinity in Changjiang River Estuary and Adjacent Sea Area

利用2005年夏季和秋季以及2006年春季在长江口外及毗邻水域进行大、小潮准同步周日连续观测的盐度资料进行整理、统计和分析,总结了长江口外及毗邻海域盐度的空间分布和时间变化特征。结果表明:1)测量区域内盐度平面分布特征是以长江口和杭州湾湾内为相对低盐中心,向外海和南北两翼盐度增高,存在盐度梯度较高的带;2)盐度垂向分布特征差异显著,除总体表现下层盐度大,上层盐度小外,时空变化差异大;3)盐度分布格局具有显著的大小潮和季节性变化。

The diurnal salinity data measured plesiochronously in the Changjiang River Estuary and its adjacent sea area respectively at neap tide and at spring in July, November 2005 and May 2006 are used to analyze and to learn the temporal and spatial variation of salinity in the studied waters. It is shown from the analysis results that the plane distribution of salinity in this area is that the lowest salinity is located at Changjiang River Estuary and Hangzhou Bay, becoming higher toward the open sea, the south and the north where a higher slainity gradients are. The vertical salinity difference is very obvious. The salinity is lower in the upper water layer and higher in the bottom water layer with a great temporal and spatial variations. In addition, the salinity in the studied areas has obvious monthly and seasonal variations.