中国北部近海温、盐度月中值应用时效及误差的初步研究

ON APPLICABILITY OF THE MIDDLE DAY VALUE METHOD FOR TEMPERATURE AND SALINITY IN THE NORTHERN CHINA SEAS

应用国家海洋局黄渤海区沿岸11个海洋站的水温、盐度资料(1960—1982),将海洋站各月15日的温、盐数据(月中值)代替中旬和月的平均水温和盐度,简称“日—旬—月”方法,它们的总体均绝差:前者,温度为0.34℃,盐度为0.17;后者,温度为0.51℃,盐度为0.23。海洋站1960—1982年各站变幅的总平均:温度为3.29℃,盐度为3.78;其相对误差:温度为15.50%,盐度为6.08%,均很小。在黄渤海区,其测站平均水深分别为50米和24米,大于沿岸海洋站的水深(<5米),受陆地水文气象影响较小。在黄渤海区海洋水文调查资料较少的情况下,应用“日—旬—月”方法产生的误差小于海洋站用此方法产生的误差。在黄渤海区春、秋渔汛期间,应用各月15日的温、盐数据划出的水文图,在某种程度上具有旬、月平均值的概念。对指导渔业生产有实用意义。

The 'middle day value' method is a method using the values of temperature and salinity on the 15 th day as the mean values for the periods of the middle ten days and the month in pratical applications. Based on the T and S data from 11 coastal stations at the Yellow Sea and Bohai Sea between 1960—1982, the deviations between the true mean values and the middle day values are analysed. It is suggested that this method is of value in pratical use such as for fishery production, especially in the data spare areas in the Yellow Sea and Bohai Sea.