The formation of sea ice causes the concentration of salt in surface waters to increase; less sea ice would mean a smaller increase in the concentration of salt.
海冰的形成导致表水中盐的浓度增加；海冰的减少意味着盐浓度的增加幅度较小。
The yellow outline shows the median sea ice extent observed by satellite sensors in September and March from 1979-2000. "extent" is the total area with an ice concentration of at least 15 percent.
黄色勾勒出由卫星传感器自1979——2000年所观测到得海冰面积的在九月和三月中间范围。
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