探讨长江中淡水在冬季过程强盛期的扩散形式及浙闽沿岸上升流出现的情况,利用2004-01月长江口调查资料,分析了27个站位的温度、盐度、密度、浊度和浓度资料.对三峡工程启用后,长江冲淡水的冬季扩散特征进行了阐述。结果表明:冬季长江冲淡水的扩散仅限于123°E以西狭长的近岸地带,与三峡工程启用前差异不大;长江冲淡水在29.7°N,122.3°E附近出现浊度锋,显示出该处为长江冲淡水南向扩散的东侧边界。由于冲淡水的诱导,台湾暖流在长江口附近爬升,爬升区层化现象明显。苏北沿岸流携带悬浮体有加入长江冲淡水一起供给浙闽沿岸流的特征。

Based on the data of temperature,salinity,density and turbidity of 27 stations off the Changjiang Estuary collected in January,2004,the diffusion characteristics of the Changjiang diluted water in winter are described in detail.The results indicated that the diffusion of the Changjiang diluted water is only restricted in a narrow near-shore area west of 123°E,varied little after the completion of the Three Gorges Project.A tur- bidity of front at 29.7°N/122.3°E emerged,indicating the south border of the Changjiang diluted water.It al- so suggested that the Subei Coastal Current carrying suspended particles joins the Changjiang diluted water.