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用方差分析法对涠洲、硇洲、闸坡、万山、云澳五个海洋站多年观测的盐度月平均值序列作周期性检验。发现万山以西的三个站的盐度序列有明显的3.4—3.5a长周期波动,万山和云澳站序列也存在明显的2.1,6.9和7.25a等长周期波动。经分析还发现这些长周期波的振幅与年周期波的振幅有相同的数量级。因此不能忽视长周期波动的影响。文章最后对某些周期波动的成因作了讨论,认为这些长周期变化的成因与厄尔尼诺事件有一定关系。
Variance analysis was used to test the monthly average salinity series of five stations in Weizhou, Weizhou, Zhapo, Wanshan and Yun’ao. It is found that the salinity sequences of three stations west of Wanshan have obvious long-period fluctuations of 3.4-3.5a, and the sequences of Wanshan and Yun’ao also have obvious periodic fluctuations of 2.1, 6.9 and 7.25a. The analysis also found that the amplitude of these long-period waves is the same order of magnitude as that of the annual-period waves. Therefore, we can not ignore the impact of long-term fluctuations. The article concludes with discussion on the causes of some periodic fluctuations, and concludes that the causes of these long-term changes are related to El Niño events.