摘要:
海水的比重是海水的一个重要物理性质,也是研究海水运动所必需的一个参数。关于大洋海水比重及其与氯度、盐度和电导的关系已有许多报导[3,5-9],为了制定新的国际海洋学常用表,Cox等人对世界各海洋表层海水的比重、盐度和温度的关系又进行了重新研究[3]。他们指出,除去低盐海水以外,所得结果与Knudsen水文表数据吻合较好,但Knudsen水文表的比重数据平均偏低0.006σt。
Abstract:
The specific gravity of 13 sea water samples from the estuary of Changjiang River at 25℃ has been determined by the pycnometer method.The results are consistent with the values computed from Knudsen's chlorinity tables within the experimental error of the method and are lower on an average of about 0.02 in sigma-25 than the values computed from the salinity by Cox,et al. equation(1970).The standard deviation of our measurements was estimated to be ±0.01 in sigma -25. The differences between the present results and the values computed from the chlorinity by Cox, et al. equation (1970) may imply that, for water of the same chlorinlty,the sea water at the estuary of Changjiang River tends to have a lower concen tration of dissolved substances than that of the ocean water. Our work shows that the Knudsen's tables may apply to the sea water at the estuary of Changjiang River,and also provides experimental evidence that the new oceanographic tables can be applied in studies on the Sea water of China Sea areas.
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