一、盐度的分布规律与影响因素难点分析影响海水盐度的因素包括气候因素(降水量与蒸发量的对比关系)、洋流性质(暖流经过的海区盐度偏高,寒流则相反)、有无陆地河流淡水汇入、结冰与融冰、海域的封闭与否等,表层海水的盐度分布具有一定的规律性。读图1,可以得出海水盐度的分布规律:由南北半球副热带海区分别向两侧的高纬度和低纬度递减。从这一规律可以看出(结合图1),海水的盐度大小并 First, the distribution of salinity and influencing factors Difficulties Analysis of factors affecting seawater salinity include climatic factors (contrast between precipitation and evaporation), ocean currents (warm through the high salinity of sea areas, the cold is the opposite), there are The distribution of salinity in surface seawater has a certain regularity when no land-based river flows into fresh water, freezes and melts ice, or whether the sea area is closed or not. Figure 1 shows that the salinity distribution of seawater can be deduced from the high and low latitudes of the subtropical sea areas of the northern and southern hemispheres, respectively. It can be seen from this law (combined with Figure 1) that the salinity of seawater is