We analyze long-term tide gauge records to examine whether there is a quasi 60-year oscillation in global tides. We find that there is a significant 55-year cycle at more than half of the tide gauges analyzed. For M₂ tide, the amplitudes of the 55-year cycle range from 1.82 ± 0.80 mm (Los Angles) to 26.34 ± 6.75 mm (Cuxhaven), while for S₂ tide, the amplitudes of the 55-year cycle range from 1.02 ± 0.48 mm (San Francisco) to 8.61 ± 2.25 mm (Cuxhaven). At Cuxhaven, shallow water constituents M₄, MS₄ and M₆ tides which obtain energy from M₂ and S₂ tides also show significant 55-year cycles. It is found that the 55-year cycle significantly influences the estimation of the long-term trend of tidal amplitudes at Newlyn, Cuxhaven, Eastport and Victoria. The influence of the 55-year cycle on long-term trends of tidal amplitudes at Cuxhaven is the strongest among these stations. At Cuxhaven, the long-term trend of M₂ (S₂) amplitudes sharply increases from 0.68 ± 0.10 (0.22 ± 0.03) mm/yr to 0.93 ± 0.06 (0.31 ± 0.03) mm/yr when the 55-year cycle is removed. It is also found that the 55-year cycle in tides can partly explain the rapid change in M₂ and S₂ tides since 1980s in the North Atlantic. Quasi-60 year variations in sea levels and sea water temperature may be responsible for the 55-year cycle in tides while the detailed mechanisms still need further research.

我们分析了长期的潮汐量表记录，以检查全球潮汐是否存在大约60年的波动。我们发现，在超过一半的潮汐量表中，有一个显着的55年周期。对于M ₂潮汐，55年周期的幅度范围从1.82±0.80 mm（丢失角度）到26.34±6.75 mm（库克斯港），而对于S ₂潮汐，55年周期的幅度范围从1.02± 0.48毫米（旧金山）到8.61±2.25毫米（库克斯港）。在库克斯港，浅水成分M ₄，MS ₄和M ₆潮汐从M ₂和S ₂获得能量潮汐也显示出显着的55年周期。发现55年的周期显着影响了Newlyn，Cuxhaven，Eastport和Victoria的潮汐长期趋势的估计。在这些站中，55年周期对库克斯港的潮汐长期趋势的影响最大。在Cuxhaven，取消55年周期后，M ₂（S ₂）振幅的长期趋势从0.68±0.10（0.22±0.03）mm / yr急剧增加到0.93±0.06（0.31±0.03）mm / yr 。还发现潮汐的55年周期可以部分解释M ₂和S ₂的快速变化。自1980年代以来一直在北大西洋浪潮。海平面和海水温度的准60年变化可能是潮汐55年周期的原因，而详细的机制仍需进一步研究。