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本文对中国沿岸16个验潮站1960—1980年的海平面、气压、气温、降水、水温、盐度、地球自转相对角速度7个要素资料,用回归分析方法进行了分析计算。逐站建立了年平均海面随时间变化的线性模式,并对年平均海面的变化导因进行了粗浅分析。 1960年以来,中国沿岸年平均海面的变化趋势因海区而异。按年变化率可分三个海区:北纬38°以北为上升区,变化率为0.46cm/a;北纬34°—38°为下降区,变化率为-0.21cm/a;北纬34°以南为上升区,增率为0.38cm/a。总的平均海面以上升为总趋势,平均增率0.21cm/a。影响年平均海面的因素颇多,经计算得出本文所选因子中地球自转相对角速率、降水量为其重要因子。
In this paper, seven elements of sea level, air pressure, temperature, precipitation, water temperature, salinity and relative angular velocities of the Earth’s rotation from 16 tide gauge stations along the coast of China were analyzed and calculated by regression analysis. The linear model of annual average sea surface sea level change with time was established by station, and the causes of the annual average sea surface change were analyzed. Since 1960, the annual average sea level change of the coast of China varies with the sea area. The annual rate of change can be divided into three sea areas: rising north of 38 ° north latitude, the rate of change is 0.46 cm / a; north latitude 34 ° -38 ° is the falling region, the rate of change is -0.21 cm / a; latitude 34 ° South rising area, an increase of 0.38cm / a. The overall average sea level rose to the general trend with an average increase rate of 0.21 cm / a. The factors influencing annual average sea surface are quite many. The relative angular velocities of earth rotation and precipitation in this paper are calculated as the important factors.