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首页> 外文期刊>Tellus. A >Changing seasonally in North Atlantic coastal sea level from the analysis of long tide gauge records
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Changing seasonally in North Atlantic coastal sea level from the analysis of long tide gauge records

机译：从长期潮汐记录分析看北大西洋沿海海平面的季节性变化

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摘要

Sea level is a key variable in the context of global climate change. Climate-induced variability is expected to affect not only the mean sea level but also the amplitude and phase of its seasonal cycle. This study addresses the changes in the amplitude and phase of the annual cycle of coastal sea level in the extra-tropical North Atlantic. The physical causes of these variations are explored by analysing the association between fluctuations in the annual amplitude of sea level and in ancillary parameters [atmospheric pressure, sea-surface temperature and North Atlantic Oscillation (NAO) winter index]. The annual cycle is extracted through autoregressive decomposition, in order to be able to separate variations in seasonality from long-term interannual variations in the mean. The changes detected in the annual sea level cycle are regionally coherent, and related to changes in the analysed forcing parameters. At the northern sites, fluctuations in the annual amplitude of sea level are associated with concurrent changes in temperature, while atmospheric pressure is the dominant influence for most of the sites on the western boundary. The state of the NAO influences the annual variability in the Southern Bight, possibly through NAO-related changes in wind stress and ocean circulation.
机译：在全球气候变化的背景下，海平面是一个关键变量。预计气候引起的多变性不仅会影响平均海平面，还会影响其季节性周期的振幅和相位。这项研究解决了温带北大西洋沿海海平面年周期振幅和相位的变化。通过分析海平面年振幅的波动与辅助参数[大气压力，海面温度和北大西洋涛动（NAO）冬季指数]之间的关系，探索了这些变化的物理原因。通过自回归分解提取年度循环，以便能够将季节性变化与长期平均年际变化区分开。在年度海平面周期中检测到的变化在区域上是连贯的，并且与所分析的强迫参数的变化有关。在北部站点，海平面年振幅的波动与温度的同时变化有关，而大气压力是对西部边界上大多数站点的主要影响。 NAO的状态可能通过与NAO相关的风应力和海洋环流变化来影响南部海岸线的年度变化。

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